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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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
template<class CompatibleObjectType , typename std::enable_if< std::is_constructible< typename object_t::key_type, typename CompatibleObjectType::key_type >::value and std::is_constructible< basic_json, typename CompatibleObjectType::mapped_type >::value, int >::type = 0>
Create an object JSON value with a given content. This constructor allows any type that can be used to construct values of type object_t. Examples include the types std::map and std::unordered_map .
- Template Parameters
-
CompatibleObjectType | an object type whose key_type and value_type is compatible to object_t |
- Parameters
-
[in] | value | a value for the object |
- Complexity
- Linear in the size of the passed value.
- Exceptions
-
std::bad_alloc | if allocation for object value fails |
- Example
- The following code shows the constructor with several compatible object type parameters.
2 #include <unordered_map>
9 std::map<std::string, int> c_map
11 { "one", 1}, { "two", 2}, { "three", 3}
16 std::unordered_map<const char*, double> c_umap
18 { "one", 1.2}, { "two", 2.3}, { "three", 3.4}
23 std::multimap<std::string, bool> c_mmap
25 { "one", true}, { "two", true}, { "three", false}, { "three", true}
30 std::unordered_multimap<std::string, bool> c_ummap
32 { "one", true}, { "two", true}, { "three", false}, { "three", true}
34 json j_ummap(c_ummap);
37 std::cout << j_map << '\n';
38 std::cout << j_umap << '\n';
39 std::cout << j_mmap << '\n';
40 std::cout << j_ummap << '\n';
a class to store JSON values
namespace for Niels Lohmann
Output (play with this example online): {"one":1,"three":3,"two":2}
{"one":1.2,"three":3.4,"two":2.3}
{"one":true,"three":false,"two":true}
{"one":true,"three":false,"two":true}
The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/basic_json__CompatibleObjectType.cpp -o basic_json__CompatibleObjectType
- See also
- basic_json(const object_t&) – create an object value
- Since
- version 1.0
Definition at line 965 of file json.hpp.
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