JSON for Modern C++ 2.1.1

allocator_type
array
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at
at
at
at
at
at
back
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basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
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end
erase
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find
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get
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insert
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operator+=
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operator<
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push_back
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~basic_json
| ## ◆ operator+=() [3/4] 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 = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
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 "json.hpp" 2 3 using json = nlohmann::json; 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::json basic_json<> json default JSON class Definition: json.hpp:13933 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
Since version 1.0.0 Definition at line 5639 of file json.hpp.