JSON for Modern C++ 2.1.0

allocator_type
array
array_t
at
at
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
boolean_t
cbegin
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
count
crbegin
crend
detail::external_constructor
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
find
find
flatten
from_cbor
from_msgpack
front
front
get
get
get
get
get
get_allocator
get_ptr
get_ptr
get_ref
get_ref
insert
insert
insert
insert
insert
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_number_unsigned
is_object
is_primitive
is_string
is_structured
iterator
iterator_wrapper
iterator_wrapper
json_serializer
max_size
meta
number_float_t
number_integer_t
number_unsigned_t
object
object_t
operator value_t
operator ValueType
operator!=
operator!=
operator!=
operator+=
operator+=
operator+=
operator+=
operator<
operator<<
operator<<
operator<=
operator=
operator==
operator==
operator==
operator>
operator>=
operator>>
operator>>
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
parse
parse
parse
parse
parse
parse
parse_event_t
parser_callback_t
patch
pointer
push_back
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
to_cbor
to_msgpack
type
type_name
unflatten
value
value
value
value
value_t
value_type
~basic_json
| ## ◆ operator== [2/3] template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
bool operator== | ( | const_reference | v,
|  | std::nullptr_t |
| ) |  |
| friend
  The functions compares the given JSON value against a null pointer. As the null pointer can be used to initialize a JSON value to null, a comparison of JSON value v with a null pointer should be equivalent to call `v.is_null()`. Parameters
  [in] | v | JSON value to consider
Returns whether v is null Complexity Constant. Example The example compares several JSON types to the null pointer. 1 #include <json.hpp> 2 3 using json = nlohmann::json; 4 5 int main() 6 { 7 // create several JSON values 8 json array = {1, 2, 3}; 9 json object = {{"A", "a"}, {"B", "b"}}; 10 json number = 17; 11 json string = "foo"; 12 json null; 13 14 // output values and comparisons 15 std::cout << std::boolalpha; 16 std::cout << array << " == nullptr " << (array == nullptr) << '\n'; 17 std::cout << object << " == nullptr " << (object == nullptr) << '\n'; 18 std::cout << number << " == nullptr " << (number == nullptr) << '\n'; 19 std::cout << string << " == nullptr " << (string == nullptr) << '\n'; 20 std::cout << null << " == nullptr " << (null == nullptr) << '\n'; 21 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:12610 nlohmann::basic_json::array static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an array from an initializer list Definition: json.hpp:2164 Output (play with this example online):
    [1,2,3] == nullptr false
    {"A":"a","B":"b"} == nullptr false
    17 == nullptr false
    "foo" == nullptr false
    null == nullptr true
The example code above can be translated with
    g++ -std=c++11 -Isrc doc/examples/operator__equal__nullptr_t.cpp -o operator__equal__nullptr_t
Since version 1.0.0 Definition at line 5984 of file json.hpp.