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Niels 2015-06-21 22:42:32 +02:00
parent 770b9820fe
commit c85dbef98f
9 changed files with 441 additions and 85 deletions
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2
Makefile
View file

@ -46,7 +46,7 @@ pretty:
--indent-col1-comments --pad-oper --pad-header --align-pointer=type \
--align-reference=type --add-brackets --convert-tabs --close-templates \
--lineend=linux --preserve-date --suffix=none \
src/json.hpp src/json.hpp.re2c test/unit.cpp benchmarks/benchmarks.cpp docs/examples/*.cpp
src/json.hpp src/json.hpp.re2c test/unit.cpp benchmarks/benchmarks.cpp doc/examples/*.cpp
##########################################################################

15
doc/examples/basic_json__string_t.cpp Normal file
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@ -0,0 +1,15 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create an string_t value
json::string_t value = "The quick brown fox jumps over the lazy doc";
// create a JSON string from the value
json j(value);
// serialize the JSON array
std::cout << j << '\n';
}

1
doc/examples/basic_json__string_t.output Normal file
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@ -0,0 +1 @@
"The quick brown fox jumps over the lazy doc"

12
doc/examples/basic_json__string_t_value_type.cpp Normal file
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@ -0,0 +1,12 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create a JSON string directly from a string literal
json j("The quick brown fox jumps over the lazy doc");
// serialize the JSON array
std::cout << j << '\n';
}

1
doc/examples/basic_json__string_t_value_type.output Normal file
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@ -0,0 +1 @@
"The quick brown fox jumps over the lazy doc"

18
doc/examples/operator_serialize.cpp Normal file
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@ -0,0 +1,18 @@
#include <json.hpp>
using namespace nlohmann;
int main()
{
// create JSON values
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
// serialize without indentation
std::cout << j_object << "\n\n";
std::cout << j_array << "\n\n";
// serialize with indentation
std::cout << std::setw(4) << j_object << "\n\n";
std::cout << std::setw(2) << j_array << "\n\n";
}

17
doc/examples/operator_serialize.output Normal file
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@ -0,0 +1,17 @@
{"one":1,"two":2}
[1,2,4,8,16]
{
"one": 1,
"two": 2
}
[
1,
2,
4,
8,
16
]

230
src/json.hpp
View file

@ -84,7 +84,8 @@ struct has_mapped_type
@tparam AllocatorType type of the allocator to use
(@c std::allocator by default)
@requirement This class satisfies the Container requirements (see http://en.cppreference.com/w/cpp/concept/Container):
@requirement This class satisfies the Container requirements (see
http://en.cppreference.com/w/cpp/concept/Container):
- basic_json()
- basic_json(const basic_json&)
- reference& operator=(basic_json)
@ -392,7 +393,7 @@ class basic_json
object | `{}`
array | `[]`
@param value the type of the value to create
@param[in] value the type of the value to create
@complexity Constant.
@ -451,7 +452,7 @@ class basic_json
Create an object JSON value with a given content.
@param value a value for the object
@param[in] value a value for the object
@complexity Linear in the size of the passed @a value.
@ -477,7 +478,7 @@ class basic_json
@tparam CompatibleObjectType an object type whose `key_type` and
`value_type` is compatible to @ref object_t
@param value a value for the object
@param[in] value a value for the object
@complexity Linear in the size of the passed @a value.
@ -509,7 +510,7 @@ class basic_json
Create an array JSON value with a given content.
@param value a value for the array
@param[in] value a value for the array
@complexity Linear in the size of the passed @a value.
@ -535,7 +536,7 @@ class basic_json
@tparam CompatibleArrayType an object type whose `value_type` is compatible
to @ref array_t
@param value a value for the array
@param[in] value a value for the array
@complexity Linear in the size of the passed @a value.
@ -567,22 +568,56 @@ class basic_json
alloc.construct(m_value.array, begin(value), end(value));
}
/// create a string (explicit)
/*!
@brief create a string (explicit)
Create an string JSON value with a given content.
@param[in] value a value for the string
@complexity Linear in the size of the passed @a value.
@exception std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@liveexample{The following code shows the constructor with an @ref string_t
parameter.,basic_json__string_t}
@sa basic_json(const typename string_t::value_type*)
@sa basic_json(const CompatibleStringType&)
*/
basic_json(const string_t& value)
: m_type(value_t::string), m_value(value)
{}
/// create a string (explicit)
/*!
@brief create a string (explicit)
Create an string JSON value with a given content.
@param[in] value a literal value for the string
@complexity Linear in the size of the passed @a value.
@exception std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@liveexample{The following code shows the constructor with string literal
parameter.,basic_json__string_t_value_type}
@sa basic_json(const string_t&)
@sa basic_json(const CompatibleStringType&)
*/
basic_json(const typename string_t::value_type* value)
: basic_json(string_t(value))
{}
/// create a string (implicit)
template <class V, typename
template <class CompatibleStringType, typename
std::enable_if<
std::is_constructible<string_t, V>::value, int>::type
std::is_constructible<string_t, CompatibleStringType>::value, int>::type
= 0>
basic_json(const V& value)
basic_json(const CompatibleStringType& value)
: basic_json(string_t(value))
{}
@ -595,7 +630,7 @@ class basic_json
@brief create an integer number (explicit)
@tparam T helper type to compare number_integer_t and int
@param value an integer to create a JSON number from
@param[in] value an integer to create a JSON number from
This constructor takes care about explicitly passed values of type
number_integer_t. However, this constructor would have the same signature
@ -614,7 +649,7 @@ class basic_json
/*!
@brief create an int number to support enum type (implicit)
@param value an integer to create a JSON number from
@param[in] value an integer to create a JSON number from
This constructor allows to pass enums directly to a constructor. As C++ has
no way of specifying the type of an anonymous enum explicitly, we can only
@ -698,14 +733,14 @@ class basic_json
basic_json() is called instead of this function, yielding the JSON null
value.
@param init initializer list with JSON values
@param[in] init initializer list with JSON values
@param type_deduction internal parameter; when set to `true`, the type of
the JSON value is deducted from the initializer list @a init; when set to
`false`, the type provided via @a manual_type is forced. This mode is used
by the functions @ref array(list_init_t) and @ref object(list_init_t).
@param[in] type_deduction internal parameter; when set to `true`, the type
of the JSON value is deducted from the initializer list @a init; when set
to `false`, the type provided via @a manual_type is forced. This mode is
used by the functions @ref array(list_init_t) and @ref object(list_init_t).
@param manual_type internal parameter; when @a type_deduction is set to
@param[in] manual_type internal parameter; when @a type_deduction is set to
`false`, the created JSON value will use the provided type (only @ref
value_t::array and @ref value_t::object are valid); when @a type_deduction
is set to `true`, this parameter has no effect
@ -797,7 +832,7 @@ class basic_json
2. creating an empty array - passing the empty initializer list to the
initializer list constructor yields an empty object
@param init initializer list with JSON values to create an array from
@param[in] init initializer list with JSON values to create an array from
(optional)
@return JSON array value
@ -830,7 +865,7 @@ class basic_json
@a init can also be passed to the initializer list constructor @ref
basic_json(list_init_t, bool, value_t).
@param init initializer list to create an object from (optional)
@param[in] init initializer list to create an object from (optional)
@return JSON object value
@ -859,8 +894,8 @@ class basic_json
value. In case @a count is `0`, an empty array is created. As postcondition,
`std::distance(begin(),end()) == count` holds.
@param count the number of JSON copies of @a value to create
@param value the JSON value to copy
@param[in] count the number of JSON copies of @a value to create
@param[in] value the JSON value to copy
@complexity Linear in @a count.
@ -974,7 +1009,7 @@ class basic_json
Creates a copy of a given JSON value.
@param other the JSON value to copy
@param[in] other the JSON value to copy
@complexity Linear in the size of @a other.
@ -1045,7 +1080,7 @@ class basic_json
value @a other using move semantics. It "steals" the resources from @a
other and leaves it as JSON null value.
@param other value to move to this object
@param[in,out] other value to move to this object
@post @a other is a JSON null value
@ -1070,7 +1105,7 @@ class basic_json
strategy: It is expressed in terms of the copy constructor, destructor, and
the swap() member function.
@param other value to copy from
@param[in] other value to copy from
@complexity Linear.
@ -1165,7 +1200,7 @@ class basic_json
Python's @p json.dumps() function, and currently supports its @p indent
parameter.
@param indent if indent is nonnegative, then array elements and object
@param[in] indent if indent is nonnegative, then array elements and object
members will be pretty-printed with that indent level. An indent level of 0
will only insert newlines. -1 (the default) selects the most compact
representation
@ -2634,6 +2669,24 @@ class basic_json
/*!
@brief comparison: equal
Compares two JSON values for equality according to the following rules:
- Two JSON values are equal if (1) they are from the same type and (2)
their stored values are the same.
- Integer and floating-point numbers are automatically converted before
comparison. Floating-point numbers are compared indirectly: two
floating-point numbers `f1` and `f2` are considered equal if neither
`f1 > f2` nor `f2 > f1` holds.
- Two JSON null values are equal.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether the values @a lhs and @a rhs are equal
@complexity Linear.
@todo Add example.
@ingroup container
*/
friend bool operator==(const_reference lhs, const_reference rhs) noexcept
@ -2678,6 +2731,17 @@ class basic_json
/*!
@brief comparison: not equal
Compares two JSON values for inequality by calculating `not (lhs == rhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether the values @a lhs and @a rhs are not equal
@complexity Linear.
@todo Add example.
@ingroup container
*/
friend bool operator!=(const_reference lhs, const_reference rhs) noexcept
@ -2685,7 +2749,27 @@ class basic_json
return not (lhs == rhs);
}
/// comparison: less than
/*!
@brief comparison: less than
Compares whether one JSON value @a lhs is less than another JSON value @a
rhs according to the following rules:
- If @a lhs and @a rhs have the same type, the values are compared using
the default `<` operator.
- Integer and floating-point numbers are automatically converted before
comparison
- In case @a lhs and @a rhs have different types, the values are ignored
and the order of the types is considered, see
@ref operator<(const value_t, const value_t).
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is less than @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator<(const_reference lhs, const_reference rhs) noexcept
{
const auto lhs_type = lhs.type();
@ -2729,19 +2813,58 @@ class basic_json
return lhs_type < rhs_type;
}
/// comparison: less than or equal
/*!
@brief comparison: less than or equal
Compares whether one JSON value @a lhs is less than or equal to another
JSON value by calculating `not (rhs < lhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is less than or equal to @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator<=(const_reference lhs, const_reference rhs) noexcept
{
return not (rhs < lhs);
}
/// comparison: greater than
/*!
@brief comparison: greater than
Compares whether one JSON value @a lhs is greater than another
JSON value by calculating `not (lhs <= rhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is greater than to @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator>(const_reference lhs, const_reference rhs) noexcept
{
return not (lhs <= rhs);
}
/// comparison: greater than or equal
/*!
@brief comparison: greater than or equal
Compares whether one JSON value @a lhs is greater than or equal to another
JSON value by calculating `not (lhs < rhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is greater than or equal to @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator>=(const_reference lhs, const_reference rhs) noexcept
{
return not (lhs < rhs);
@ -2757,7 +2880,25 @@ class basic_json
/// @name serialization
/// @{
/// serialize to stream
/*!
@brief serialize to stream
Serialize the given JSON value @a j to the output stream @a o. The JSON
value will be serialized using the @ref dump member function. The
indentation of the output can be controlled with the member variable
`width` of the output stream @a o. For instance, using the manipulator
`std::setw(4)` on @a o sets the indentation level to `4` and the
serialization result is the same as calling `dump(4)`.
@param[in,out] o stream to serialize to
@param[in] j JSON value to serialize
@return the stream @a o
@complexity Linear.
@liveexample{,operator_serialize}
*/
friend std::ostream& operator<<(std::ostream& o, const basic_json& j)
{
// read width member and use it as indentation parameter if nonzero
@ -2772,7 +2913,10 @@ class basic_json
return o;
}
/// serialize to stream
/*!
@brief serialize to stream
@copydoc operator<<(std::ostream&, const basic_json&)
*/
friend std::ostream& operator>>(const basic_json& j, std::ostream& o)
{
return o << j;
@ -2872,8 +3016,8 @@ class basic_json
characters by a sequence of "\u" followed by a four-digit hex
representation.
@param o the stream to write the escaped string to
@param s the string to escape
@param[out] o the stream to write the escaped string to
@param[in] s the string to escape
*/
static void escape_string(std::ostream& o, const string_t& s) noexcept
{
@ -2961,10 +3105,10 @@ class basic_json
- integer numbers are converted implictly via operator<<
- floating-point numbers are converted to a string using "%g" format
@param o stream to write to
@param pretty_print whether the output shall be pretty-printed
@param indent_step the indent level
@param current_indent the current indent level (only used internally)
@param[out] o stream to write to
@param[in] pretty_print whether the output shall be pretty-printed
@param[in] indent_step the indent level
@param[in] current_indent the current indent level (only used internally)
*/
void dump(std::ostream& o, const bool pretty_print, const unsigned int indent_step,
const unsigned int current_indent = 0) const noexcept
@ -4254,8 +4398,8 @@ class basic_json
/*!
@brief create a string from a Unicode code point
@param codepoint1 the code point (can be high surrogate)
@param codepoint2 the code point (can be low surrogate or 0)
@param[in] codepoint1 the code point (can be high surrogate)
@param[in] codepoint2 the code point (can be low surrogate or 0)
@return string representation of the code point
@exception std::out_of_range if code point is >0x10ffff
@exception std::invalid_argument if the low surrogate is invalid
@ -5671,11 +5815,13 @@ struct hash<nlohmann::json>
}
/*!
@brief user-defined string literal for JSON values
This operator implements a user-defined string literal for JSON objects. It can
be used by adding \p "_json" to a string literal and returns a JSON object if
no parse error occurred.
@param s a string representation of a JSON object
@param[in] s a string representation of a JSON object
@return a JSON object
*/
inline nlohmann::json operator "" _json(const char* s, std::size_t)

230
src/json.hpp.re2c
View file

@ -84,7 +84,8 @@ struct has_mapped_type
@tparam AllocatorType type of the allocator to use
(@c std::allocator by default)
@requirement This class satisfies the Container requirements (see http://en.cppreference.com/w/cpp/concept/Container):
@requirement This class satisfies the Container requirements (see
http://en.cppreference.com/w/cpp/concept/Container):
- basic_json()
- basic_json(const basic_json&)
- reference& operator=(basic_json)
@ -392,7 +393,7 @@ class basic_json
object | `{}`
array | `[]`
@param value the type of the value to create
@param[in] value the type of the value to create
@complexity Constant.
@ -451,7 +452,7 @@ class basic_json
Create an object JSON value with a given content.
@param value a value for the object
@param[in] value a value for the object
@complexity Linear in the size of the passed @a value.
@ -477,7 +478,7 @@ class basic_json
@tparam CompatibleObjectType an object type whose `key_type` and
`value_type` is compatible to @ref object_t
@param value a value for the object
@param[in] value a value for the object
@complexity Linear in the size of the passed @a value.
@ -509,7 +510,7 @@ class basic_json
Create an array JSON value with a given content.
@param value a value for the array
@param[in] value a value for the array
@complexity Linear in the size of the passed @a value.
@ -535,7 +536,7 @@ class basic_json
@tparam CompatibleArrayType an object type whose `value_type` is compatible
to @ref array_t
@param value a value for the array
@param[in] value a value for the array
@complexity Linear in the size of the passed @a value.
@ -567,22 +568,56 @@ class basic_json
alloc.construct(m_value.array, begin(value), end(value));
}
/// create a string (explicit)
/*!
@brief create a string (explicit)
Create an string JSON value with a given content.
@param[in] value a value for the string
@complexity Linear in the size of the passed @a value.
@exception std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@liveexample{The following code shows the constructor with an @ref string_t
parameter.,basic_json__string_t}
@sa basic_json(const typename string_t::value_type*)
@sa basic_json(const CompatibleStringType&)
*/
basic_json(const string_t& value)
: m_type(value_t::string), m_value(value)
{}
/// create a string (explicit)
/*!
@brief create a string (explicit)
Create an string JSON value with a given content.
@param[in] value a literal value for the string
@complexity Linear in the size of the passed @a value.
@exception std::bad_alloc if allocation for string value fails (thrown by
the constructor of @ref json_value)
@liveexample{The following code shows the constructor with string literal
parameter.,basic_json__string_t_value_type}
@sa basic_json(const string_t&)
@sa basic_json(const CompatibleStringType&)
*/
basic_json(const typename string_t::value_type* value)
: basic_json(string_t(value))
{}
/// create a string (implicit)
template <class V, typename
template <class CompatibleStringType, typename
std::enable_if<
std::is_constructible<string_t, V>::value, int>::type
std::is_constructible<string_t, CompatibleStringType>::value, int>::type
= 0>
basic_json(const V& value)
basic_json(const CompatibleStringType& value)
: basic_json(string_t(value))
{}
@ -595,7 +630,7 @@ class basic_json
@brief create an integer number (explicit)
@tparam T helper type to compare number_integer_t and int
@param value an integer to create a JSON number from
@param[in] value an integer to create a JSON number from
This constructor takes care about explicitly passed values of type
number_integer_t. However, this constructor would have the same signature
@ -614,7 +649,7 @@ class basic_json
/*!
@brief create an int number to support enum type (implicit)
@param value an integer to create a JSON number from
@param[in] value an integer to create a JSON number from
This constructor allows to pass enums directly to a constructor. As C++ has
no way of specifying the type of an anonymous enum explicitly, we can only
@ -698,14 +733,14 @@ class basic_json
basic_json() is called instead of this function, yielding the JSON null
value.
@param init initializer list with JSON values
@param[in] init initializer list with JSON values
@param type_deduction internal parameter; when set to `true`, the type of
the JSON value is deducted from the initializer list @a init; when set to
`false`, the type provided via @a manual_type is forced. This mode is used
by the functions @ref array(list_init_t) and @ref object(list_init_t).
@param[in] type_deduction internal parameter; when set to `true`, the type
of the JSON value is deducted from the initializer list @a init; when set
to `false`, the type provided via @a manual_type is forced. This mode is
used by the functions @ref array(list_init_t) and @ref object(list_init_t).
@param manual_type internal parameter; when @a type_deduction is set to
@param[in] manual_type internal parameter; when @a type_deduction is set to
`false`, the created JSON value will use the provided type (only @ref
value_t::array and @ref value_t::object are valid); when @a type_deduction
is set to `true`, this parameter has no effect
@ -797,7 +832,7 @@ class basic_json
2. creating an empty array - passing the empty initializer list to the
initializer list constructor yields an empty object
@param init initializer list with JSON values to create an array from
@param[in] init initializer list with JSON values to create an array from
(optional)
@return JSON array value
@ -830,7 +865,7 @@ class basic_json
@a init can also be passed to the initializer list constructor @ref
basic_json(list_init_t, bool, value_t).
@param init initializer list to create an object from (optional)
@param[in] init initializer list to create an object from (optional)
@return JSON object value
@ -859,8 +894,8 @@ class basic_json
value. In case @a count is `0`, an empty array is created. As postcondition,
`std::distance(begin(),end()) == count` holds.
@param count the number of JSON copies of @a value to create
@param value the JSON value to copy
@param[in] count the number of JSON copies of @a value to create
@param[in] value the JSON value to copy
@complexity Linear in @a count.
@ -974,7 +1009,7 @@ class basic_json
Creates a copy of a given JSON value.
@param other the JSON value to copy
@param[in] other the JSON value to copy
@complexity Linear in the size of @a other.
@ -1045,7 +1080,7 @@ class basic_json
value @a other using move semantics. It "steals" the resources from @a
other and leaves it as JSON null value.
@param other value to move to this object
@param[in,out] other value to move to this object
@post @a other is a JSON null value
@ -1070,7 +1105,7 @@ class basic_json
strategy: It is expressed in terms of the copy constructor, destructor, and
the swap() member function.
@param other value to copy from
@param[in] other value to copy from
@complexity Linear.
@ -1165,7 +1200,7 @@ class basic_json
Python's @p json.dumps() function, and currently supports its @p indent
parameter.
@param indent if indent is nonnegative, then array elements and object
@param[in] indent if indent is nonnegative, then array elements and object
members will be pretty-printed with that indent level. An indent level of 0
will only insert newlines. -1 (the default) selects the most compact
representation
@ -2634,6 +2669,24 @@ class basic_json
/*!
@brief comparison: equal
Compares two JSON values for equality according to the following rules:
- Two JSON values are equal if (1) they are from the same type and (2)
their stored values are the same.
- Integer and floating-point numbers are automatically converted before
comparison. Floating-point numbers are compared indirectly: two
floating-point numbers `f1` and `f2` are considered equal if neither
`f1 > f2` nor `f2 > f1` holds.
- Two JSON null values are equal.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether the values @a lhs and @a rhs are equal
@complexity Linear.
@todo Add example.
@ingroup container
*/
friend bool operator==(const_reference lhs, const_reference rhs) noexcept
@ -2678,6 +2731,17 @@ class basic_json
/*!
@brief comparison: not equal
Compares two JSON values for inequality by calculating `not (lhs == rhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether the values @a lhs and @a rhs are not equal
@complexity Linear.
@todo Add example.
@ingroup container
*/
friend bool operator!=(const_reference lhs, const_reference rhs) noexcept
@ -2685,7 +2749,27 @@ class basic_json
return not (lhs == rhs);
}
/// comparison: less than
/*!
@brief comparison: less than
Compares whether one JSON value @a lhs is less than another JSON value @a
rhs according to the following rules:
- If @a lhs and @a rhs have the same type, the values are compared using
the default `<` operator.
- Integer and floating-point numbers are automatically converted before
comparison
- In case @a lhs and @a rhs have different types, the values are ignored
and the order of the types is considered, see
@ref operator<(const value_t, const value_t).
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is less than @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator<(const_reference lhs, const_reference rhs) noexcept
{
const auto lhs_type = lhs.type();
@ -2729,19 +2813,58 @@ class basic_json
return lhs_type < rhs_type;
}
/// comparison: less than or equal
/*!
@brief comparison: less than or equal
Compares whether one JSON value @a lhs is less than or equal to another
JSON value by calculating `not (rhs < lhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is less than or equal to @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator<=(const_reference lhs, const_reference rhs) noexcept
{
return not (rhs < lhs);
}
/// comparison: greater than
/*!
@brief comparison: greater than
Compares whether one JSON value @a lhs is greater than another
JSON value by calculating `not (lhs <= rhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is greater than to @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator>(const_reference lhs, const_reference rhs) noexcept
{
return not (lhs <= rhs);
}
/// comparison: greater than or equal
/*!
@brief comparison: greater than or equal
Compares whether one JSON value @a lhs is greater than or equal to another
JSON value by calculating `not (lhs < rhs)`.
@param[in] lhs first JSON value to consider
@param[in] rhs second JSON value to consider
@return whether @a lhs is greater than or equal to @a rhs
@complexity Linear.
@todo Add example.
*/
friend bool operator>=(const_reference lhs, const_reference rhs) noexcept
{
return not (lhs < rhs);
@ -2757,7 +2880,25 @@ class basic_json
/// @name serialization
/// @{
/// serialize to stream
/*!
@brief serialize to stream
Serialize the given JSON value @a j to the output stream @a o. The JSON
value will be serialized using the @ref dump member function. The
indentation of the output can be controlled with the member variable
`width` of the output stream @a o. For instance, using the manipulator
`std::setw(4)` on @a o sets the indentation level to `4` and the
serialization result is the same as calling `dump(4)`.
@param[in,out] o stream to serialize to
@param[in] j JSON value to serialize
@return the stream @a o
@complexity Linear.
@liveexample{,operator_serialize}
*/
friend std::ostream& operator<<(std::ostream& o, const basic_json& j)
{
// read width member and use it as indentation parameter if nonzero
@ -2772,7 +2913,10 @@ class basic_json
return o;
}
/// serialize to stream
/*!
@brief serialize to stream
@copydoc operator<<(std::ostream&, const basic_json&)
*/
friend std::ostream& operator>>(const basic_json& j, std::ostream& o)
{
return o << j;
@ -2872,8 +3016,8 @@ class basic_json
characters by a sequence of "\u" followed by a four-digit hex
representation.
@param o the stream to write the escaped string to
@param s the string to escape
@param[out] o the stream to write the escaped string to
@param[in] s the string to escape
*/
static void escape_string(std::ostream& o, const string_t& s) noexcept
{
@ -2961,10 +3105,10 @@ class basic_json
- integer numbers are converted implictly via operator<<
- floating-point numbers are converted to a string using "%g" format
@param o stream to write to
@param pretty_print whether the output shall be pretty-printed
@param indent_step the indent level
@param current_indent the current indent level (only used internally)
@param[out] o stream to write to
@param[in] pretty_print whether the output shall be pretty-printed
@param[in] indent_step the indent level
@param[in] current_indent the current indent level (only used internally)
*/
void dump(std::ostream& o, const bool pretty_print, const unsigned int indent_step,
const unsigned int current_indent = 0) const noexcept
@ -4254,8 +4398,8 @@ class basic_json
/*!
@brief create a string from a Unicode code point
@param codepoint1 the code point (can be high surrogate)
@param codepoint2 the code point (can be low surrogate or 0)
@param[in] codepoint1 the code point (can be high surrogate)
@param[in] codepoint2 the code point (can be low surrogate or 0)
@return string representation of the code point
@exception std::out_of_range if code point is >0x10ffff
@exception std::invalid_argument if the low surrogate is invalid
@ -4977,11 +5121,13 @@ struct hash<nlohmann::json>
}
/*!
@brief user-defined string literal for JSON values
This operator implements a user-defined string literal for JSON objects. It can
be used by adding \p "_json" to a string literal and returns a JSON object if
no parse error occurred.
@param s a string representation of a JSON object
@param[in] s a string representation of a JSON object
@return a JSON object
*/
inline nlohmann::json operator "" _json(const char* s, std::size_t)