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~basic_json
| 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>
nlohmann::basic_json::basic_json | ( | const CompatibleObjectType & | val | ) |
| inline
  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] | val | a value for the object
  Complexity Linear in the size of the passed val. Exceptions
  std::bad_alloc | if allocation for object value fails
  Example The following code shows the constructor with several compatible object type parameters. 1 #include <json.hpp> 2 #include <unordered_map> 3 4 using namespace nlohmann; 5 6 int main() 7 { 8 // create an object from std::map 9 std::map<std::string, int> c_map 10 { 11 {"one", 1}, {"two", 2}, {"three", 3} 12 }; 13 json j_map(c_map); 14 15 // create an object from std::unordered_map 16 std::unordered_map<const char*, double> c_umap 17 { 18 {"one", 1.2}, {"two", 2.3}, {"three", 3.4} 19 }; 20 json j_umap(c_umap); 21 22 // create an object from std::multimap 23 std::multimap<std::string, bool> c_mmap 24 { 25 {"one", true}, {"two", true}, {"three", false}, {"three", true} 26 }; 27 json j_mmap(c_mmap); // only one entry for key "three" is used 28 29 // create an object from std::unordered_multimap 30 std::unordered_multimap<std::string, bool> c_ummap 31 { 32 {"one", true}, {"two", true}, {"three", false}, {"three", true} 33 }; 34 json j_ummap(c_ummap); // only one entry for key "three" is used 35 36 // serialize the JSON objects 37 std::cout << j_map << '\n'; 38 std::cout << j_umap << '\n'; 39 std::cout << j_mmap << '\n'; 40 std::cout << j_ummap << '\n'; 41 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:191 nlohmann namespace for Niels Lohmann Definition: json.hpp:88 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 with
      g++ -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 1.0.0 Definition at line 975 of file json.hpp.