allocator_type
array
array_t
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
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_pointer
const_reference
const_reverse_iterator
count
crbegin
crend
difference_type
dump
empty
end
end
erase
erase
erase
erase
find
find
front
front
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_object
is_primitive
is_string
is_structured
iterator_wrapper
iterator_wrapper
max_size
number_float_t
number_integer_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[]
parse
parse
parse
parse_event_t
parser_callback_t
pointer
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
type
value
value
value_t
value_type
~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.
  #include <json.hpp>
  #include <unordered_map>
  using namespace nlohmann;
  int main()
  {
  // create an object from std::map
  std::map<std::string, int> c_map
  {
  {"one", 1}, {"two", 2}, {"three", 3}
  };
  json j_map(c_map);
  // create an object from std::unordered_map
  std::unordered_map<const char*, double> c_umap
  {
  {"one", 1.2}, {"two", 2.3}, {"three", 3.4}
  };
  json j_umap(c_umap);
  // create an object from std::multimap
  std::multimap<std::string, bool> c_mmap
  {
  {"one", true}, {"two", true}, {"three", false}, {"three", true}
  };
  json j_mmap(c_mmap); // only one entry for key "three" is used
  // create an object from std::unordered_multimap
  std::unordered_multimap<std::string, bool> c_ummap
  {
  {"one", true}, {"two", true}, {"three", false}, {"three", true}
  };
  json j_ummap(c_ummap); // only one entry for key "three" is used
  // serialize the JSON objects
  std::cout << j_map << '\n';
  std::cout << j_umap << '\n';
  std::cout << j_mmap << '\n';
  std::cout << j_ummap << '\n';
  }
  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.