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◆ 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>
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
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std::domain_error | when called on a type other than JSON object or null; example: "cannot use push_back() with number" |
- Complexity\n Logarithmic in the size of the container, O(log(
size() )).
- Example\n 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.
8 json object = {{ "one", 1}, { "two", 2}};
12 std::cout << object << '\n';
13 std::cout << null << '\n';
22 std::cout << object << '\n';
23 std::cout << null << '\n';
basic_json value_type the type of elements in a basic_json container
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an array from an initializer list
a class to store JSON values
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 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 5368 of file json.hpp.
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