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>
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. ^^ 2 #include <nlohmann/json.hpp> 9 json object = {{
"one", 1}, {
"two", 2}};
13 std::cout <<
object <<
'\n';
14 std::cout << null <<
'\n';
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");
23 std::cout <<
object <<
'\n';
24 std::cout << null <<
'\n';
basic_json<> json
default JSON class
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 withg++ -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 17204 of file json.hpp.