fixed #135: operator[] now only works on nonconst JSON objects

README.md

@@ -42,11 +42,9 @@ to the files you want to use JSON objects. That's it. Do not forget to set the n
 
 Though it's 2015 already, the support for C++11 is still a bit sparse. Currently, the following compilers are known to work:
 
-- GCC 4.9 - 5.2
+- GCC 4.9 - 5.2 (and possible later)
-- Clang 3.4 - 3.7
+- Clang 3.4 - 3.7 (and possible later)
-- Microsoft Visual C++ 14.0 RC
+- Microsoft Visual C++ 14.0 RC (and possible later)
-
-Note using GCC 4.8, the unit tests cannot be compiled due to a [bug in the preprocessor](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55971).
 
 I would be happy to learn about other compilers/versions.
 

src/json.hpp

@@ -2691,33 +2691,6 @@ class basic_json
 
     Returns a reference to the element at with specified key @a key.
 
-    @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
-
-    @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}
-    */
-    const_reference operator[](const typename object_t::key_type& key) const
-    {
-        // at only works for objects
-        if (m_type != value_t::object)
-        {
-            throw std::domain_error("cannot use operator[] with " + type_name());
-        }
-
-        return m_value.object->operator[](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.
@@ -2754,36 +2727,6 @@ class basic_json
         return m_value.object->operator[](key);
     }
 
-    /*!
-    @brief access specified object element
-
-    Returns a reference to the element at with specified key @a key.
-
-    @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
-
-    @throw std::domain_error if JSON is not an object or 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}
-    */
-    template<typename T, std::size_t n>
-    const_reference operator[](const T (&key)[n]) const
-    {
-        // at only works for objects
-        if (m_type != value_t::object)
-        {
-            throw std::domain_error("cannot use operator[] with " + type_name());
-        }
-
-        return m_value.object->operator[](key);
-    }
-
     /*!
     @brief access the first element
 

src/json.hpp.re2c

@@ -2691,33 +2691,6 @@ class basic_json
 
     Returns a reference to the element at with specified key @a key.
 
-    @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
-
-    @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}
-    */
-    const_reference operator[](const typename object_t::key_type& key) const
-    {
-        // at only works for objects
-        if (m_type != value_t::object)
-        {
-            throw std::domain_error("cannot use operator[] with " + type_name());
-        }
-
-        return m_value.object->operator[](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.
@@ -2754,36 +2727,6 @@ class basic_json
         return m_value.object->operator[](key);
     }
 
-    /*!
-    @brief access specified object element
-
-    Returns a reference to the element at with specified key @a key.
-
-    @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
-
-    @throw std::domain_error if JSON is not an object or 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}
-    */
-    template<typename T, std::size_t n>
-    const_reference operator[](const T (&key)[n]) const
-    {
-        // at only works for objects
-        if (m_type != value_t::object)
-        {
-            throw std::domain_error("cannot use operator[] with " + type_name());
-        }
-
-        return m_value.object->operator[](key);
-    }
-
     /*!
     @brief access the first element
 

test/unit.cpp

@@ -3098,38 +3098,24 @@ TEST_CASE("element access")
             {
                 CHECK(j["integer"] == json(1));
                 CHECK(j[json::object_t::key_type("integer")] == j["integer"]);
-                CHECK(j_const["integer"] == json(1));
-                CHECK(j_const[json::object_t::key_type("integer")] == j["integer"]);
 
                 CHECK(j["boolean"] == json(true));
                 CHECK(j[json::object_t::key_type("boolean")] == j["boolean"]);
-                CHECK(j_const["boolean"] == json(true));
-                CHECK(j_const[json::object_t::key_type("boolean")] == j["boolean"]);
 
                 CHECK(j["null"] == json(nullptr));
                 CHECK(j[json::object_t::key_type("null")] == j["null"]);
-                CHECK(j_const["null"] == json(nullptr));
-                CHECK(j_const[json::object_t::key_type("null")] == j["null"]);
 
                 CHECK(j["string"] == json("hello world"));
                 CHECK(j[json::object_t::key_type("string")] == j["string"]);
-                CHECK(j_const["string"] == json("hello world"));
-                CHECK(j_const[json::object_t::key_type("string")] == j["string"]);
 
                 CHECK(j["floating"] == json(42.23));
                 CHECK(j[json::object_t::key_type("floating")] == j["floating"]);
-                CHECK(j_const["floating"] == json(42.23));
-                CHECK(j_const[json::object_t::key_type("floating")] == j["floating"]);
 
                 CHECK(j["object"] == json(json::object()));
                 CHECK(j[json::object_t::key_type("object")] == j["object"]);
-                CHECK(j_const["object"] == json(json::object()));
-                CHECK(j_const[json::object_t::key_type("object")] == j["object"]);
 
                 CHECK(j["array"] == json({1, 2, 3}));
                 CHECK(j[json::object_t::key_type("array")] == j["array"]);
-                CHECK(j_const["array"] == json({1, 2, 3}));
-                CHECK(j_const[json::object_t::key_type("array")] == j["array"]);
             }
 
             SECTION("access on non-object type")
@@ -3141,8 +3127,6 @@ TEST_CASE("element access")
                     const json j_const_nonobject(j_nonobject);
                     CHECK_NOTHROW(j_nonobject["foo"]);
                     CHECK_NOTHROW(j_nonobject2[json::object_t::key_type("foo")]);
-                    CHECK_THROWS_AS(j_const_nonobject["foo"], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject[json::object_t::key_type("foo")], std::domain_error);
                 }
 
                 SECTION("boolean")
@@ -3151,8 +3135,6 @@ TEST_CASE("element access")
                     const json j_const_nonobject(j_nonobject);
                     CHECK_THROWS_AS(j_nonobject["foo"], std::domain_error);
                     CHECK_THROWS_AS(j_nonobject[json::object_t::key_type("foo")], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject["foo"], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject[json::object_t::key_type("foo")], std::domain_error);
                 }
 
                 SECTION("string")
@@ -3161,8 +3143,6 @@ TEST_CASE("element access")
                     const json j_const_nonobject(j_nonobject);
                     CHECK_THROWS_AS(j_nonobject["foo"], std::domain_error);
                     CHECK_THROWS_AS(j_nonobject[json::object_t::key_type("foo")], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject["foo"], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject[json::object_t::key_type("foo")], std::domain_error);
                 }
 
                 SECTION("array")
@@ -3171,8 +3151,6 @@ TEST_CASE("element access")
                     const json j_const_nonobject(j_nonobject);
                     CHECK_THROWS_AS(j_nonobject["foo"], std::domain_error);
                     CHECK_THROWS_AS(j_nonobject[json::object_t::key_type("foo")], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject["foo"], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject[json::object_t::key_type("foo")], std::domain_error);
                 }
 
                 SECTION("number (integer)")
@@ -3181,8 +3159,6 @@ TEST_CASE("element access")
                     const json j_const_nonobject(j_nonobject);
                     CHECK_THROWS_AS(j_nonobject["foo"], std::domain_error);
                     CHECK_THROWS_AS(j_nonobject[json::object_t::key_type("foo")], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject["foo"], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject[json::object_t::key_type("foo")], std::domain_error);
                 }
 
                 SECTION("number (floating-point)")
@@ -3191,8 +3167,6 @@ TEST_CASE("element access")
                     const json j_const_nonobject(j_nonobject);
                     CHECK_THROWS_AS(j_nonobject["foo"], std::domain_error);
                     CHECK_THROWS_AS(j_nonobject[json::object_t::key_type("foo")], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject["foo"], std::domain_error);
-                    CHECK_THROWS_AS(j_const_nonobject[json::object_t::key_type("foo")], std::domain_error);
                 }
             }
         }