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◆ type()
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>
Return the type of the JSON value as a value from the value_t enumeration.
- Returns
- the type of the JSON value
- Complexity\n Constant.
- Exception safety\n No-throw guarantee: this member function never throws
- exceptions.
- Example\n The following code exemplifies
type() for all JSON - types.
17 std::cout << std::boolalpha;
18 std::cout << ( j_null. type() == json::value_t::null) << '\n';
19 std::cout << ( j_boolean. type() == json::value_t::boolean) << '\n';
24 std::cout << ( j_string. type() == json::value_t::string) << '\n';
constexpr value_t type() const noexcept return the type of the JSON value (explicit)
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an array from an initializer list
static basic_json object(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an object from an initializer list
a class to store JSON values
basic_json<> json default JSON class
Output (play with this example online):
true
true
true
true
true
true
true
The example code above can be translated with g++ -std=c++11 -Isrc doc/examples/type.cpp -o type
- Since
- version 1.0.0
Definition at line 2681 of file json.hpp.
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