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

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Niels 2015-12-13 11:26:55 +01:00
parent c767f464bb
commit a70a7a8001
4 changed files with 3 additions and 145 deletions
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8
README.md
View file

@ -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
- Clang 3.4 - 3.7
- Microsoft Visual C++ 14.0 RC
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).
- GCC 4.9 - 5.2 (and possible later)
- Clang 3.4 - 3.7 (and possible later)
- Microsoft Visual C++ 14.0 RC (and possible later)
I would be happy to learn about other compilers/versions.

57
src/json.hpp
View file

@ -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

57
src/json.hpp.re2c
View file

@ -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

26
test/unit.cpp
View file

@ -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);
}
}
}