JSON for Modern C++ 3.8.0

accept
accept
accept
allocator_type
array
array_t
at
at
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back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
binary
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front
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~basic_json
| ## ◆ operator+=() [3/4]
reference nlohmann::basic_json::operator+= | ( | const typename object_t::value_type & | val | ) |
| inline
  add an object to an object Inserts the given element val to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting val. Parameters
  [in] | val | the value to add to the JSON object
  Exceptions
  type_error.308 | when called on a type other than JSON object or null; example: `"cannot use push_back() with number"`
  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 <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json object = {{"one", 1}, {"two", 2}}; 10 json null; 11 12 // print values 13 std::cout << object << '\n'; 14 std::cout << null << '\n'; 15 16 // add values 17 object.push_back(json::object_t::value_type("three", 3)); 18 object += json::object_t::value_type("four", 4); 19 null += json::object_t::value_type("A", "a"); 20 null += json::object_t::value_type("B", "b"); 21 22 // print values 23 std::cout << object << '\n'; 24 std::cout << null << '\n'; 25 } 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 -Isingle_include doc/examples/push_back__object_t__value.cpp -o push_back__object_t__value
Since version 1.0.0 Definition at line 21732 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2933