diff --git a/src/json.hpp b/src/json.hpp
index 343d2356..63bc8026 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -2675,7 +2675,9 @@ class basic_json
              std::enable_if<
                  not std::is_pointer<ValueType>::value
                  and not std::is_same<ValueType, typename string_t::value_type>::value
+#ifndef _MSC_VER  // Fix for issue #167 operator<< abiguity under VS2015
                  and not std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
+#endif
                  , int>::type = 0>
     operator ValueType() const
     {
@@ -3060,8 +3062,6 @@ class basic_json
     the object and filled with a `null` value to make `key` a valid reference.
     In case the value was `null` before, it is converted to an object.
 
-    @note This function is required for compatibility reasons with Clang.
-
     @param[in] key  key of the element to access
 
     @return reference to the element at key @a key
@@ -3081,25 +3081,9 @@ class basic_json
     @since version 1.0.0
     */
     template<typename T, std::size_t n>
-    reference operator[](const T (&key)[n])
+    reference operator[](T* (&key)[n])
     {
-        // implicitly convert null to object
-        if (is_null())
-        {
-            m_type = value_t::object;
-            m_value = value_t::object;
-        }
-
-        // at only works for objects
-        if (is_object())
-        {
-            assert(m_value.object != nullptr);
-            return m_value.object->operator[](key);
-        }
-        else
-        {
-            throw std::domain_error("cannot use operator[] with " + type_name());
-        }
+        return operator[](static_cast<const T>(key));
     }
 
     /*!
@@ -3132,7 +3116,89 @@ class basic_json
     @since version 1.0.0
     */
     template<typename T, std::size_t n>
-    const_reference operator[](const T (&key)[n]) const
+    const_reference operator[](T* (&key)[n]) const
+    {
+        return operator[](static_cast<const T>(key));
+    }
+
+    /*!
+    @brief access specified object element
+
+    Returns a reference to the element at with specified key @a key.
+
+    @note If @a key is not found in the object, then it is silently added to
+    the object and filled with a `null` value to make `key` a valid reference.
+    In case the value was `null` before, it is converted to an object.
+
+    @param[in] key  key of the element to access
+
+    @return reference to the element at key @a key
+
+    @throw std::domain_error if JSON is not an object or null; example:
+    `"cannot use operator[] with null"`
+
+    @complexity Logarithmic in the size of the container.
+
+    @liveexample{The example below shows how object elements can be read and
+    written using the [] operator.,operatorarray__key_type}
+
+    @sa @ref at(const typename object_t::key_type&) for access by reference
+    with range checking
+    @sa @ref value() for access by value with a default value
+
+    @since version 1.0.1
+    */
+    template<typename T>
+    reference operator[](T* key)
+    {
+        // implicitly convert null to object
+        if (is_null())
+        {
+            m_type = value_t::object;
+            m_value = value_t::object;
+        }
+
+        // at only works for objects
+        if (is_object())
+        {
+            assert(m_value.object != nullptr);
+            return m_value.object->operator[](key);
+        }
+        else
+        {
+            throw std::domain_error("cannot use operator[] with " + type_name());
+        }
+    }
+
+    /*!
+    @brief read-only access specified object element
+
+    Returns a const reference to the element at with specified key @a key. No
+    bounds checking is performed.
+
+    @warning If the element with key @a key does not exist, the behavior is
+    undefined.
+
+    @param[in] key  key of the element to access
+
+    @return const reference to the element at key @a key
+
+    @throw std::domain_error if JSON is not an object; example: `"cannot use
+    operator[] with null"`
+
+    @complexity Logarithmic in the size of the container.
+
+    @liveexample{The example below shows how object elements can be read using
+    the [] operator.,operatorarray__key_type_const}
+
+    @sa @ref at(const typename object_t::key_type&) for access by reference
+    with range checking
+    @sa @ref value() for access by value with a default value
+
+    @since version 1.0.1
+    */
+    template<typename T>
+    const_reference operator[](T* key) const
     {
         // at only works for objects
         if (is_object())
@@ -6745,789 +6811,386 @@ class basic_json
             m_start = m_cursor;
             assert(m_start != nullptr);
 
-
-            {
-                lexer_char_t yych;
-                unsigned int yyaccept = 0;
-                static const unsigned char yybm[] =
-                {
-                    0,   0,   0,   0,   0,   0,   0,   0,
-                    0,  32,  32,   0,   0,  32,   0,   0,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    96,  64,   0,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    192, 192, 192, 192, 192, 192, 192, 192,
-                    192, 192,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,   0,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                    64,  64,  64,  64,  64,  64,  64,  64,
-                };
-                if ((m_limit - m_cursor) < 5)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
+            
+    {
+        lexer_char_t yych;
+        unsigned int yyaccept = 0;
+        static const unsigned char yybm[] = {
+              0,   0,   0,   0,   0,   0,   0,   0, 
+              0,  32,  32,   0,   0,  32,   0,   0, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             96,  64,   0,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+            192, 192, 192, 192, 192, 192, 192, 192, 
+            192, 192,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,   0,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+             64,  64,  64,  64,  64,  64,  64,  64, 
+        };
+        if ((m_limit - m_cursor) < 5) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= ':') {
+            if (yych <= ' ') {
+                if (yych <= '\n') {
+                    if (yych <= 0x00) goto basic_json_parser_28;
+                    if (yych <= 0x08) goto basic_json_parser_30;
+                    if (yych >= '\n') goto basic_json_parser_4;
+                } else {
+                    if (yych == '\r') goto basic_json_parser_2;
+                    if (yych <= 0x1F) goto basic_json_parser_30;
                 }
-                yych = *m_cursor;
-                if (yych <= ':')
-                {
-                    if (yych <= ' ')
-                    {
-                        if (yych <= '\n')
-                        {
-                            if (yych <= 0x00)
-                            {
-                                goto basic_json_parser_28;
-                            }
-                            if (yych <= 0x08)
-                            {
-                                goto basic_json_parser_30;
-                            }
-                            if (yych >= '\n')
-                            {
-                                goto basic_json_parser_4;
-                            }
-                        }
-                        else
-                        {
-                            if (yych == '\r')
-                            {
-                                goto basic_json_parser_2;
-                            }
-                            if (yych <= 0x1F)
-                            {
-                                goto basic_json_parser_30;
-                            }
-                        }
+            } else {
+                if (yych <= ',') {
+                    if (yych == '"') goto basic_json_parser_27;
+                    if (yych <= '+') goto basic_json_parser_30;
+                    goto basic_json_parser_16;
+                } else {
+                    if (yych <= '/') {
+                        if (yych <= '-') goto basic_json_parser_23;
+                        goto basic_json_parser_30;
+                    } else {
+                        if (yych <= '0') goto basic_json_parser_24;
+                        if (yych <= '9') goto basic_json_parser_26;
+                        goto basic_json_parser_18;
                     }
-                    else
-                    {
-                        if (yych <= ',')
-                        {
-                            if (yych == '"')
-                            {
-                                goto basic_json_parser_27;
-                            }
-                            if (yych <= '+')
-                            {
-                                goto basic_json_parser_30;
-                            }
-                            goto basic_json_parser_16;
-                        }
-                        else
-                        {
-                            if (yych <= '/')
-                            {
-                                if (yych <= '-')
-                                {
-                                    goto basic_json_parser_23;
-                                }
-                                goto basic_json_parser_30;
-                            }
-                            else
-                            {
-                                if (yych <= '0')
-                                {
-                                    goto basic_json_parser_24;
-                                }
-                                if (yych <= '9')
-                                {
-                                    goto basic_json_parser_26;
-                                }
-                                goto basic_json_parser_18;
-                            }
-                        }
-                    }
-                }
-                else
-                {
-                    if (yych <= 'n')
-                    {
-                        if (yych <= ']')
-                        {
-                            if (yych == '[')
-                            {
-                                goto basic_json_parser_8;
-                            }
-                            if (yych <= '\\')
-                            {
-                                goto basic_json_parser_30;
-                            }
-                            goto basic_json_parser_10;
-                        }
-                        else
-                        {
-                            if (yych == 'f')
-                            {
-                                goto basic_json_parser_22;
-                            }
-                            if (yych <= 'm')
-                            {
-                                goto basic_json_parser_30;
-                            }
-                            goto basic_json_parser_20;
-                        }
-                    }
-                    else
-                    {
-                        if (yych <= '{')
-                        {
-                            if (yych == 't')
-                            {
-                                goto basic_json_parser_21;
-                            }
-                            if (yych <= 'z')
-                            {
-                                goto basic_json_parser_30;
-                            }
-                            goto basic_json_parser_12;
-                        }
-                        else
-                        {
-                            if (yych <= '}')
-                            {
-                                if (yych <= '|')
-                                {
-                                    goto basic_json_parser_30;
-                                }
-                                goto basic_json_parser_14;
-                            }
-                            else
-                            {
-                                if (yych == 0xEF)
-                                {
-                                    goto basic_json_parser_6;
-                                }
-                                goto basic_json_parser_30;
-                            }
-                        }
-                    }
-                }
-basic_json_parser_2:
-                ++m_cursor;
-                yych = *m_cursor;
-                goto basic_json_parser_5;
-basic_json_parser_3:
-                {
-                    return scan();
-                }
-basic_json_parser_4:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-basic_json_parser_5:
-                if (yybm[0 + yych] & 32)
-                {
-                    goto basic_json_parser_4;
-                }
-                goto basic_json_parser_3;
-basic_json_parser_6:
-                yyaccept = 0;
-                yych = *(m_marker = ++m_cursor);
-                if (yych == 0xBB)
-                {
-                    goto basic_json_parser_64;
-                }
-basic_json_parser_7:
-                {
-                    return token_type::parse_error;
-                }
-basic_json_parser_8:
-                ++m_cursor;
-                {
-                    return token_type::begin_array;
-                }
-basic_json_parser_10:
-                ++m_cursor;
-                {
-                    return token_type::end_array;
-                }
-basic_json_parser_12:
-                ++m_cursor;
-                {
-                    return token_type::begin_object;
-                }
-basic_json_parser_14:
-                ++m_cursor;
-                {
-                    return token_type::end_object;
-                }
-basic_json_parser_16:
-                ++m_cursor;
-                {
-                    return token_type::value_separator;
-                }
-basic_json_parser_18:
-                ++m_cursor;
-                {
-                    return token_type::name_separator;
-                }
-basic_json_parser_20:
-                yyaccept = 0;
-                yych = *(m_marker = ++m_cursor);
-                if (yych == 'u')
-                {
-                    goto basic_json_parser_60;
-                }
-                goto basic_json_parser_7;
-basic_json_parser_21:
-                yyaccept = 0;
-                yych = *(m_marker = ++m_cursor);
-                if (yych == 'r')
-                {
-                    goto basic_json_parser_56;
-                }
-                goto basic_json_parser_7;
-basic_json_parser_22:
-                yyaccept = 0;
-                yych = *(m_marker = ++m_cursor);
-                if (yych == 'a')
-                {
-                    goto basic_json_parser_51;
-                }
-                goto basic_json_parser_7;
-basic_json_parser_23:
-                yych = *++m_cursor;
-                if (yych <= '/')
-                {
-                    goto basic_json_parser_7;
-                }
-                if (yych <= '0')
-                {
-                    goto basic_json_parser_50;
-                }
-                if (yych <= '9')
-                {
-                    goto basic_json_parser_41;
-                }
-                goto basic_json_parser_7;
-basic_json_parser_24:
-                yyaccept = 1;
-                yych = *(m_marker = ++m_cursor);
-                if (yych <= 'D')
-                {
-                    if (yych == '.')
-                    {
-                        goto basic_json_parser_43;
-                    }
-                }
-                else
-                {
-                    if (yych <= 'E')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    if (yych == 'e')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                }
-basic_json_parser_25:
-                {
-                    return token_type::value_number;
-                }
-basic_json_parser_26:
-                yyaccept = 1;
-                yych = *(m_marker = ++m_cursor);
-                goto basic_json_parser_42;
-basic_json_parser_27:
-                yyaccept = 0;
-                yych = *(m_marker = ++m_cursor);
-                if (yych <= 0x0F)
-                {
-                    goto basic_json_parser_7;
-                }
-                goto basic_json_parser_32;
-basic_json_parser_28:
-                ++m_cursor;
-                {
-                    return token_type::end_of_input;
-                }
-basic_json_parser_30:
-                yych = *++m_cursor;
-                goto basic_json_parser_7;
-basic_json_parser_31:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-basic_json_parser_32:
-                if (yybm[0 + yych] & 64)
-                {
-                    goto basic_json_parser_31;
-                }
-                if (yych <= 0x0F)
-                {
-                    goto basic_json_parser_33;
-                }
-                if (yych <= '"')
-                {
-                    goto basic_json_parser_35;
-                }
-                goto basic_json_parser_34;
-basic_json_parser_33:
-                m_cursor = m_marker;
-                if (yyaccept == 0)
-                {
-                    goto basic_json_parser_7;
-                }
-                else
-                {
-                    goto basic_json_parser_25;
-                }
-basic_json_parser_34:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= 'e')
-                {
-                    if (yych <= '/')
-                    {
-                        if (yych == '"')
-                        {
-                            goto basic_json_parser_31;
-                        }
-                        if (yych <= '.')
-                        {
-                            goto basic_json_parser_33;
-                        }
-                        goto basic_json_parser_31;
-                    }
-                    else
-                    {
-                        if (yych <= '\\')
-                        {
-                            if (yych <= '[')
-                            {
-                                goto basic_json_parser_33;
-                            }
-                            goto basic_json_parser_31;
-                        }
-                        else
-                        {
-                            if (yych == 'b')
-                            {
-                                goto basic_json_parser_31;
-                            }
-                            goto basic_json_parser_33;
-                        }
-                    }
-                }
-                else
-                {
-                    if (yych <= 'q')
-                    {
-                        if (yych <= 'f')
-                        {
-                            goto basic_json_parser_31;
-                        }
-                        if (yych == 'n')
-                        {
-                            goto basic_json_parser_31;
-                        }
-                        goto basic_json_parser_33;
-                    }
-                    else
-                    {
-                        if (yych <= 's')
-                        {
-                            if (yych <= 'r')
-                            {
-                                goto basic_json_parser_31;
-                            }
-                            goto basic_json_parser_33;
-                        }
-                        else
-                        {
-                            if (yych <= 't')
-                            {
-                                goto basic_json_parser_31;
-                            }
-                            if (yych <= 'u')
-                            {
-                                goto basic_json_parser_37;
-                            }
-                            goto basic_json_parser_33;
-                        }
-                    }
-                }
-basic_json_parser_35:
-                ++m_cursor;
-                {
-                    return token_type::value_string;
-                }
-basic_json_parser_37:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= '@')
-                {
-                    if (yych <= '/')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych >= ':')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-                else
-                {
-                    if (yych <= 'F')
-                    {
-                        goto basic_json_parser_38;
-                    }
-                    if (yych <= '`')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych >= 'g')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-basic_json_parser_38:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= '@')
-                {
-                    if (yych <= '/')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych >= ':')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-                else
-                {
-                    if (yych <= 'F')
-                    {
-                        goto basic_json_parser_39;
-                    }
-                    if (yych <= '`')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych >= 'g')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-basic_json_parser_39:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= '@')
-                {
-                    if (yych <= '/')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych >= ':')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-                else
-                {
-                    if (yych <= 'F')
-                    {
-                        goto basic_json_parser_40;
-                    }
-                    if (yych <= '`')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych >= 'g')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-basic_json_parser_40:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= '@')
-                {
-                    if (yych <= '/')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych <= '9')
-                    {
-                        goto basic_json_parser_31;
-                    }
-                    goto basic_json_parser_33;
-                }
-                else
-                {
-                    if (yych <= 'F')
-                    {
-                        goto basic_json_parser_31;
-                    }
-                    if (yych <= '`')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych <= 'f')
-                    {
-                        goto basic_json_parser_31;
-                    }
-                    goto basic_json_parser_33;
-                }
-basic_json_parser_41:
-                yyaccept = 1;
-                m_marker = ++m_cursor;
-                if ((m_limit - m_cursor) < 3)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-basic_json_parser_42:
-                if (yybm[0 + yych] & 128)
-                {
-                    goto basic_json_parser_41;
-                }
-                if (yych <= 'D')
-                {
-                    if (yych != '.')
-                    {
-                        goto basic_json_parser_25;
-                    }
-                }
-                else
-                {
-                    if (yych <= 'E')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    if (yych == 'e')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    goto basic_json_parser_25;
-                }
-basic_json_parser_43:
-                yych = *++m_cursor;
-                if (yych <= '/')
-                {
-                    goto basic_json_parser_33;
-                }
-                if (yych <= '9')
-                {
-                    goto basic_json_parser_48;
-                }
-                goto basic_json_parser_33;
-basic_json_parser_44:
-                yych = *++m_cursor;
-                if (yych <= ',')
-                {
-                    if (yych != '+')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                }
-                else
-                {
-                    if (yych <= '-')
-                    {
-                        goto basic_json_parser_45;
-                    }
-                    if (yych <= '/')
-                    {
-                        goto basic_json_parser_33;
-                    }
-                    if (yych <= '9')
-                    {
-                        goto basic_json_parser_46;
-                    }
-                    goto basic_json_parser_33;
-                }
-basic_json_parser_45:
-                yych = *++m_cursor;
-                if (yych <= '/')
-                {
-                    goto basic_json_parser_33;
-                }
-                if (yych >= ':')
-                {
-                    goto basic_json_parser_33;
-                }
-basic_json_parser_46:
-                ++m_cursor;
-                if (m_limit <= m_cursor)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= '/')
-                {
-                    goto basic_json_parser_25;
-                }
-                if (yych <= '9')
-                {
-                    goto basic_json_parser_46;
-                }
-                goto basic_json_parser_25;
-basic_json_parser_48:
-                yyaccept = 1;
-                m_marker = ++m_cursor;
-                if ((m_limit - m_cursor) < 3)
-                {
-                    yyfill();    // LCOV_EXCL_LINE;
-                }
-                yych = *m_cursor;
-                if (yych <= 'D')
-                {
-                    if (yych <= '/')
-                    {
-                        goto basic_json_parser_25;
-                    }
-                    if (yych <= '9')
-                    {
-                        goto basic_json_parser_48;
-                    }
-                    goto basic_json_parser_25;
-                }
-                else
-                {
-                    if (yych <= 'E')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    if (yych == 'e')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    goto basic_json_parser_25;
-                }
-basic_json_parser_50:
-                yyaccept = 1;
-                yych = *(m_marker = ++m_cursor);
-                if (yych <= 'D')
-                {
-                    if (yych == '.')
-                    {
-                        goto basic_json_parser_43;
-                    }
-                    goto basic_json_parser_25;
-                }
-                else
-                {
-                    if (yych <= 'E')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    if (yych == 'e')
-                    {
-                        goto basic_json_parser_44;
-                    }
-                    goto basic_json_parser_25;
-                }
-basic_json_parser_51:
-                yych = *++m_cursor;
-                if (yych != 'l')
-                {
-                    goto basic_json_parser_33;
-                }
-                yych = *++m_cursor;
-                if (yych != 's')
-                {
-                    goto basic_json_parser_33;
-                }
-                yych = *++m_cursor;
-                if (yych != 'e')
-                {
-                    goto basic_json_parser_33;
-                }
-                ++m_cursor;
-                {
-                    return token_type::literal_false;
-                }
-basic_json_parser_56:
-                yych = *++m_cursor;
-                if (yych != 'u')
-                {
-                    goto basic_json_parser_33;
-                }
-                yych = *++m_cursor;
-                if (yych != 'e')
-                {
-                    goto basic_json_parser_33;
-                }
-                ++m_cursor;
-                {
-                    return token_type::literal_true;
-                }
-basic_json_parser_60:
-                yych = *++m_cursor;
-                if (yych != 'l')
-                {
-                    goto basic_json_parser_33;
-                }
-                yych = *++m_cursor;
-                if (yych != 'l')
-                {
-                    goto basic_json_parser_33;
-                }
-                ++m_cursor;
-                {
-                    return token_type::literal_null;
-                }
-basic_json_parser_64:
-                yych = *++m_cursor;
-                if (yych != 0xBF)
-                {
-                    goto basic_json_parser_33;
-                }
-                ++m_cursor;
-                {
-                    return scan();
                 }
             }
+        } else {
+            if (yych <= 'n') {
+                if (yych <= ']') {
+                    if (yych == '[') goto basic_json_parser_8;
+                    if (yych <= '\\') goto basic_json_parser_30;
+                    goto basic_json_parser_10;
+                } else {
+                    if (yych == 'f') goto basic_json_parser_22;
+                    if (yych <= 'm') goto basic_json_parser_30;
+                    goto basic_json_parser_20;
+                }
+            } else {
+                if (yych <= '{') {
+                    if (yych == 't') goto basic_json_parser_21;
+                    if (yych <= 'z') goto basic_json_parser_30;
+                    goto basic_json_parser_12;
+                } else {
+                    if (yych <= '}') {
+                        if (yych <= '|') goto basic_json_parser_30;
+                        goto basic_json_parser_14;
+                    } else {
+                        if (yych == 0xEF) goto basic_json_parser_6;
+                        goto basic_json_parser_30;
+                    }
+                }
+            }
+        }
+basic_json_parser_2:
+        ++m_cursor;
+        yych = *m_cursor;
+        goto basic_json_parser_5;
+basic_json_parser_3:
+        { return scan(); }
+basic_json_parser_4:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+basic_json_parser_5:
+        if (yybm[0+yych] & 32) {
+            goto basic_json_parser_4;
+        }
+        goto basic_json_parser_3;
+basic_json_parser_6:
+        yyaccept = 0;
+        yych = *(m_marker = ++m_cursor);
+        if (yych == 0xBB) goto basic_json_parser_64;
+basic_json_parser_7:
+        { return token_type::parse_error; }
+basic_json_parser_8:
+        ++m_cursor;
+        { return token_type::begin_array; }
+basic_json_parser_10:
+        ++m_cursor;
+        { return token_type::end_array; }
+basic_json_parser_12:
+        ++m_cursor;
+        { return token_type::begin_object; }
+basic_json_parser_14:
+        ++m_cursor;
+        { return token_type::end_object; }
+basic_json_parser_16:
+        ++m_cursor;
+        { return token_type::value_separator; }
+basic_json_parser_18:
+        ++m_cursor;
+        { return token_type::name_separator; }
+basic_json_parser_20:
+        yyaccept = 0;
+        yych = *(m_marker = ++m_cursor);
+        if (yych == 'u') goto basic_json_parser_60;
+        goto basic_json_parser_7;
+basic_json_parser_21:
+        yyaccept = 0;
+        yych = *(m_marker = ++m_cursor);
+        if (yych == 'r') goto basic_json_parser_56;
+        goto basic_json_parser_7;
+basic_json_parser_22:
+        yyaccept = 0;
+        yych = *(m_marker = ++m_cursor);
+        if (yych == 'a') goto basic_json_parser_51;
+        goto basic_json_parser_7;
+basic_json_parser_23:
+        yych = *++m_cursor;
+        if (yych <= '/') goto basic_json_parser_7;
+        if (yych <= '0') goto basic_json_parser_50;
+        if (yych <= '9') goto basic_json_parser_41;
+        goto basic_json_parser_7;
+basic_json_parser_24:
+        yyaccept = 1;
+        yych = *(m_marker = ++m_cursor);
+        if (yych <= 'D') {
+            if (yych == '.') goto basic_json_parser_43;
+        } else {
+            if (yych <= 'E') goto basic_json_parser_44;
+            if (yych == 'e') goto basic_json_parser_44;
+        }
+basic_json_parser_25:
+        { return token_type::value_number; }
+basic_json_parser_26:
+        yyaccept = 1;
+        yych = *(m_marker = ++m_cursor);
+        goto basic_json_parser_42;
+basic_json_parser_27:
+        yyaccept = 0;
+        yych = *(m_marker = ++m_cursor);
+        if (yych <= 0x0F) goto basic_json_parser_7;
+        goto basic_json_parser_32;
+basic_json_parser_28:
+        ++m_cursor;
+        { return token_type::end_of_input; }
+basic_json_parser_30:
+        yych = *++m_cursor;
+        goto basic_json_parser_7;
+basic_json_parser_31:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+basic_json_parser_32:
+        if (yybm[0+yych] & 64) {
+            goto basic_json_parser_31;
+        }
+        if (yych <= 0x0F) goto basic_json_parser_33;
+        if (yych <= '"') goto basic_json_parser_35;
+        goto basic_json_parser_34;
+basic_json_parser_33:
+        m_cursor = m_marker;
+        if (yyaccept == 0) {
+            goto basic_json_parser_7;
+        } else {
+            goto basic_json_parser_25;
+        }
+basic_json_parser_34:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= 'e') {
+            if (yych <= '/') {
+                if (yych == '"') goto basic_json_parser_31;
+                if (yych <= '.') goto basic_json_parser_33;
+                goto basic_json_parser_31;
+            } else {
+                if (yych <= '\\') {
+                    if (yych <= '[') goto basic_json_parser_33;
+                    goto basic_json_parser_31;
+                } else {
+                    if (yych == 'b') goto basic_json_parser_31;
+                    goto basic_json_parser_33;
+                }
+            }
+        } else {
+            if (yych <= 'q') {
+                if (yych <= 'f') goto basic_json_parser_31;
+                if (yych == 'n') goto basic_json_parser_31;
+                goto basic_json_parser_33;
+            } else {
+                if (yych <= 's') {
+                    if (yych <= 'r') goto basic_json_parser_31;
+                    goto basic_json_parser_33;
+                } else {
+                    if (yych <= 't') goto basic_json_parser_31;
+                    if (yych <= 'u') goto basic_json_parser_37;
+                    goto basic_json_parser_33;
+                }
+            }
+        }
+basic_json_parser_35:
+        ++m_cursor;
+        { return token_type::value_string; }
+basic_json_parser_37:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= '@') {
+            if (yych <= '/') goto basic_json_parser_33;
+            if (yych >= ':') goto basic_json_parser_33;
+        } else {
+            if (yych <= 'F') goto basic_json_parser_38;
+            if (yych <= '`') goto basic_json_parser_33;
+            if (yych >= 'g') goto basic_json_parser_33;
+        }
+basic_json_parser_38:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= '@') {
+            if (yych <= '/') goto basic_json_parser_33;
+            if (yych >= ':') goto basic_json_parser_33;
+        } else {
+            if (yych <= 'F') goto basic_json_parser_39;
+            if (yych <= '`') goto basic_json_parser_33;
+            if (yych >= 'g') goto basic_json_parser_33;
+        }
+basic_json_parser_39:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= '@') {
+            if (yych <= '/') goto basic_json_parser_33;
+            if (yych >= ':') goto basic_json_parser_33;
+        } else {
+            if (yych <= 'F') goto basic_json_parser_40;
+            if (yych <= '`') goto basic_json_parser_33;
+            if (yych >= 'g') goto basic_json_parser_33;
+        }
+basic_json_parser_40:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= '@') {
+            if (yych <= '/') goto basic_json_parser_33;
+            if (yych <= '9') goto basic_json_parser_31;
+            goto basic_json_parser_33;
+        } else {
+            if (yych <= 'F') goto basic_json_parser_31;
+            if (yych <= '`') goto basic_json_parser_33;
+            if (yych <= 'f') goto basic_json_parser_31;
+            goto basic_json_parser_33;
+        }
+basic_json_parser_41:
+        yyaccept = 1;
+        m_marker = ++m_cursor;
+        if ((m_limit - m_cursor) < 3) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+basic_json_parser_42:
+        if (yybm[0+yych] & 128) {
+            goto basic_json_parser_41;
+        }
+        if (yych <= 'D') {
+            if (yych != '.') goto basic_json_parser_25;
+        } else {
+            if (yych <= 'E') goto basic_json_parser_44;
+            if (yych == 'e') goto basic_json_parser_44;
+            goto basic_json_parser_25;
+        }
+basic_json_parser_43:
+        yych = *++m_cursor;
+        if (yych <= '/') goto basic_json_parser_33;
+        if (yych <= '9') goto basic_json_parser_48;
+        goto basic_json_parser_33;
+basic_json_parser_44:
+        yych = *++m_cursor;
+        if (yych <= ',') {
+            if (yych != '+') goto basic_json_parser_33;
+        } else {
+            if (yych <= '-') goto basic_json_parser_45;
+            if (yych <= '/') goto basic_json_parser_33;
+            if (yych <= '9') goto basic_json_parser_46;
+            goto basic_json_parser_33;
+        }
+basic_json_parser_45:
+        yych = *++m_cursor;
+        if (yych <= '/') goto basic_json_parser_33;
+        if (yych >= ':') goto basic_json_parser_33;
+basic_json_parser_46:
+        ++m_cursor;
+        if (m_limit <= m_cursor) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= '/') goto basic_json_parser_25;
+        if (yych <= '9') goto basic_json_parser_46;
+        goto basic_json_parser_25;
+basic_json_parser_48:
+        yyaccept = 1;
+        m_marker = ++m_cursor;
+        if ((m_limit - m_cursor) < 3) yyfill(); // LCOV_EXCL_LINE;
+        yych = *m_cursor;
+        if (yych <= 'D') {
+            if (yych <= '/') goto basic_json_parser_25;
+            if (yych <= '9') goto basic_json_parser_48;
+            goto basic_json_parser_25;
+        } else {
+            if (yych <= 'E') goto basic_json_parser_44;
+            if (yych == 'e') goto basic_json_parser_44;
+            goto basic_json_parser_25;
+        }
+basic_json_parser_50:
+        yyaccept = 1;
+        yych = *(m_marker = ++m_cursor);
+        if (yych <= 'D') {
+            if (yych == '.') goto basic_json_parser_43;
+            goto basic_json_parser_25;
+        } else {
+            if (yych <= 'E') goto basic_json_parser_44;
+            if (yych == 'e') goto basic_json_parser_44;
+            goto basic_json_parser_25;
+        }
+basic_json_parser_51:
+        yych = *++m_cursor;
+        if (yych != 'l') goto basic_json_parser_33;
+        yych = *++m_cursor;
+        if (yych != 's') goto basic_json_parser_33;
+        yych = *++m_cursor;
+        if (yych != 'e') goto basic_json_parser_33;
+        ++m_cursor;
+        { return token_type::literal_false; }
+basic_json_parser_56:
+        yych = *++m_cursor;
+        if (yych != 'u') goto basic_json_parser_33;
+        yych = *++m_cursor;
+        if (yych != 'e') goto basic_json_parser_33;
+        ++m_cursor;
+        { return token_type::literal_true; }
+basic_json_parser_60:
+        yych = *++m_cursor;
+        if (yych != 'l') goto basic_json_parser_33;
+        yych = *++m_cursor;
+        if (yych != 'l') goto basic_json_parser_33;
+        ++m_cursor;
+        { return token_type::literal_null; }
+basic_json_parser_64:
+        yych = *++m_cursor;
+        if (yych != 0xBF) goto basic_json_parser_33;
+        ++m_cursor;
+        { return scan(); }
+    }
 
 
         }
diff --git a/src/json.hpp.re2c b/src/json.hpp.re2c
index d384f313..a3e7c790 100644
--- a/src/json.hpp.re2c
+++ b/src/json.hpp.re2c
@@ -2675,7 +2675,9 @@ class basic_json
              std::enable_if<
                  not std::is_pointer<ValueType>::value
                  and not std::is_same<ValueType, typename string_t::value_type>::value
+#ifndef _MSC_VER  // Fix for issue #167 operator<< abiguity under VS2015
                  and not std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
+#endif
                  , int>::type = 0>
     operator ValueType() const
     {
@@ -3060,8 +3062,6 @@ class basic_json
     the object and filled with a `null` value to make `key` a valid reference.
     In case the value was `null` before, it is converted to an object.
 
-    @note This function is required for compatibility reasons with Clang.
-
     @param[in] key  key of the element to access
 
     @return reference to the element at key @a key
@@ -3081,25 +3081,9 @@ class basic_json
     @since version 1.0.0
     */
     template<typename T, std::size_t n>
-    reference operator[](const T (&key)[n])
+    reference operator[](T* (&key)[n])
     {
-        // implicitly convert null to object
-        if (is_null())
-        {
-            m_type = value_t::object;
-            m_value = value_t::object;
-        }
-
-        // at only works for objects
-        if (is_object())
-        {
-            assert(m_value.object != nullptr);
-            return m_value.object->operator[](key);
-        }
-        else
-        {
-            throw std::domain_error("cannot use operator[] with " + type_name());
-        }
+        return operator[](static_cast<const T>(key));
     }
 
     /*!
@@ -3132,7 +3116,89 @@ class basic_json
     @since version 1.0.0
     */
     template<typename T, std::size_t n>
-    const_reference operator[](const T (&key)[n]) const
+    const_reference operator[](T* (&key)[n]) const
+    {
+        return operator[](static_cast<const T>(key));
+    }
+
+    /*!
+    @brief access specified object element
+
+    Returns a reference to the element at with specified key @a key.
+
+    @note If @a key is not found in the object, then it is silently added to
+    the object and filled with a `null` value to make `key` a valid reference.
+    In case the value was `null` before, it is converted to an object.
+
+    @param[in] key  key of the element to access
+
+    @return reference to the element at key @a key
+
+    @throw std::domain_error if JSON is not an object or null; example:
+    `"cannot use operator[] with null"`
+
+    @complexity Logarithmic in the size of the container.
+
+    @liveexample{The example below shows how object elements can be read and
+    written using the [] operator.,operatorarray__key_type}
+
+    @sa @ref at(const typename object_t::key_type&) for access by reference
+    with range checking
+    @sa @ref value() for access by value with a default value
+
+    @since version 1.0.1
+    */
+    template<typename T>
+    reference operator[](T* key)
+    {
+        // implicitly convert null to object
+        if (is_null())
+        {
+            m_type = value_t::object;
+            m_value = value_t::object;
+        }
+
+        // at only works for objects
+        if (is_object())
+        {
+            assert(m_value.object != nullptr);
+            return m_value.object->operator[](key);
+        }
+        else
+        {
+            throw std::domain_error("cannot use operator[] with " + type_name());
+        }
+    }
+
+    /*!
+    @brief read-only access specified object element
+
+    Returns a const reference to the element at with specified key @a key. No
+    bounds checking is performed.
+
+    @warning If the element with key @a key does not exist, the behavior is
+    undefined.
+
+    @param[in] key  key of the element to access
+
+    @return const reference to the element at key @a key
+
+    @throw std::domain_error if JSON is not an object; example: `"cannot use
+    operator[] with null"`
+
+    @complexity Logarithmic in the size of the container.
+
+    @liveexample{The example below shows how object elements can be read using
+    the [] operator.,operatorarray__key_type_const}
+
+    @sa @ref at(const typename object_t::key_type&) for access by reference
+    with range checking
+    @sa @ref value() for access by value with a default value
+
+    @since version 1.0.1
+    */
+    template<typename T>
+    const_reference operator[](T* key) const
     {
         // at only works for objects
         if (is_object())
diff --git a/test/unit.cpp b/test/unit.cpp
index 8b3bc19b..282c6f90 100644
--- a/test/unit.cpp
+++ b/test/unit.cpp
@@ -11504,4 +11504,52 @@ TEST_CASE("regression tests")
     {
         CHECK(json::parse("\"\\ud80c\\udc60abc\"").get<json::string_t>() == u8"\U00013060abc");
     }
+
+    SECTION("issue #144 - Cannot index by key of type static constexpr const char*")
+    {
+        json j;
+
+        // Non-const access with key as "char []"
+        char array_key[] = "Key1";
+        CHECK_NOTHROW(j[array_key] = 1);
+        CHECK(j[array_key] == json(1));
+
+        // Non-const access with key as "const char[]"
+        const char const_array_key[] = "Key2";
+        CHECK_NOTHROW(j[const_array_key] = 2);
+        CHECK(j[const_array_key] == json(2));
+
+        // Non-const access with key as "char *"
+        char _ptr_key[] = "Key3";
+        char * ptr_key = &_ptr_key[0];
+        CHECK_NOTHROW(j[ptr_key] = 3);
+        CHECK(j[ptr_key] == json(3));
+
+        // Non-const access with key as "const char *"
+        const char * const_ptr_key = "Key4";
+        CHECK_NOTHROW(j[const_ptr_key] = 4);
+        CHECK(j[const_ptr_key] == json(4));
+
+        // Non-const access with key as "static constexpr const char *"
+        static constexpr const char* constexpr_ptr_key = "Key5";
+        CHECK_NOTHROW(j[constexpr_ptr_key] = 5);
+        CHECK(j[constexpr_ptr_key] == json(5));
+
+        const json j_const = j;
+
+        // Const access with key as "char []"
+        CHECK(j_const[array_key] == json(1));
+
+        // Const access with key as "const char[]"
+        CHECK(j_const[const_array_key] == json(2));
+
+        //Const access with key as "char *"
+        CHECK(j_const[ptr_key] == json(3));
+
+        // Const access with key as "const char *"
+        CHECK(j_const[const_ptr_key] == json(4));
+
+        // Const access with key as "static constexpr const char *"
+        CHECK(j_const[constexpr_ptr_key] == json(5));
+    }
 }