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◆ push_back() [4/4]
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>
void nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >::push_back |
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std::initializer_list< basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer > > |
init | ) |
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inline |
This function allows to use push_back with an initializer list. In case
- the current value is an object,
- the initializer list init contains only two elements, and
- the first element of init is a string,
init is converted into an object element and added using push_back(const typename object_t::value_type&). Otherwise, init is converted to a JSON value and added using push_back(basic_json&&).
- Parameters
-
- Complexity\n Linear in the size of the initializer list init.
- Note
- This function is required to resolve an ambiguous overload error, because pairs like
{"key", "value"} can be both interpreted as object_t::value_type or std::initializer_list<basic_json> , see https://github.com/nlohmann/json/issues/235 for more information.
- Example\n The example shows how initializer lists are treated as
- objects when possible.
8 json object = {{ "one", 1}, { "two", 2}};
12 std::cout << object << '\n';
13 std::cout << null << '\n';
16 object.push_back({ "three", 3});
17 object += { "four", 4};
18 null.push_back({ "five", 5});
21 std::cout << object << '\n';
22 std::cout << null << '\n';
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}
[["five",5]]
The example code above can be translated with g++ -std=c++11 -Isrc doc/examples/push_back__initializer_list.cpp -o push_back__initializer_list
Definition at line 5399 of file json.hpp.
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