JSON for Modern C++ 2.1.1
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◆ basic_json() [8/9]

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>
nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >::basic_json ( const basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer > &  other)
inline

Creates a copy of a given JSON value.

Parameters
[in]otherthe JSON value to copy
Complexity\n Linear in the size of other.
Requirements\n This function helps basic_json satisfying the
Container requirements:
  • The complexity is linear.
  • As postcondition, it holds: other == basic_json(other).
Exceptions
std::bad_allocif allocation for object, array, or string fails.
Example\n The following code shows an example for the copy
constructor.
1#include <json.hpp>
2
3using json = nlohmann::json;
4
5int main()
6{
7 // create a JSON array
8 json j1 = {"one", "two", 3, 4.5, false};
9
10 // create a copy
11 json j2(j1);
12
13 // serialize the JSON array
14 std::cout << j1 << " = " << j2 << '\n';
15 std::cout << std::boolalpha << (j1 == j2) << '\n';
16}
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:2165
a class to store JSON values
Definition json.hpp:1040
basic_json<> json
default JSON class
Definition json.hpp:12369

Output (play with this example online):
["one","two",3,4.5,false] = ["one","two",3,4.5,false]
true

The example code above can be translated with
g++ -std=c++11 -Isrc doc/examples/basic_json__basic_json.cpp -o basic_json__basic_json 
Since
version 1.0.0

Definition at line 2428 of file json.hpp.