JSON for Modern C++ 3.0

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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>
reference nlohmann::basic_json::operator+= | ( | const typename object_t::value_type & | value | ) |
| inline
  add an object to an object Inserts the given element value to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting value. Parameters
  value | the value to add to the JSON object
  Exceptions
  std::domain_error | when called on a type other than JSON object or null
  Complexity Logarithmic in the size of the container, O(log(`size()`)). Example The example shows how `push_back` and `+=` can be used to add elements to a JSON object. Note how the `null` value was silently converted to a JSON object. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create JSON values 8 json object = {{"one", 1}, {"two", 2}}; 9 json null; 10 11 // print values 12 std::cout << object << '\n'; 13 std::cout << null << '\n'; 14 15 // add values 16 object.push_back(json::object_t::value_type("three", 3)); 17 object += json::object_t::value_type("four", 4); 18 null += json::object_t::value_type("A", "a"); 19 null += json::object_t::value_type("B", "b"); 20 21 // print values 22 std::cout << object << '\n'; 23 std::cout << null << '\n'; 24 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:130 nlohmann namespace for Niels Lohmann Definition: json.hpp:55 nlohmann::basic_json::push_back void push_back(basic_json &&value) add an object to an array Definition: json.hpp:3615 Output (play with this example online):
      {"one":1,"two":2}
      null
      {"four":4,"one":1,"three":3,"two":2}
      {"A":"a","B":"b"}
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/push_back__object_t__value.cpp -o push_back__object_t__value