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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>
This function returns true iff the JSON type is primitive (string, number, boolean, or null).
- Returns
true if type is primitive (string, number, boolean, or null), false otherwise.
- Complexity
- Constant.
- Exception safety
- No-throw guarantee: this member function never throws exceptions.
- Example
- The following code exemplifies
is_primitive() for all JSON types. 10 json j_number_integer = 17; 11 json j_number_float = 23.42; 12 json j_number_unsigned_integer = 12345678987654321u; 13 json j_object = {{ "one", 1}, { "two", 2}}; 14 json j_array = {1, 2, 4, 8, 16}; 15 json j_string = "Hello, world"; 18 std::cout << std::boolalpha; 19 std::cout << j_null.is_primitive() << '\n'; 20 std::cout << j_boolean.is_primitive() << '\n'; 21 std::cout << j_number_integer.is_primitive() << '\n'; 22 std::cout << j_number_unsigned_integer.is_primitive() << '\n'; 23 std::cout << j_number_float.is_primitive() << '\n'; 24 std::cout << j_object.is_primitive() << '\n'; 25 std::cout << j_array.is_primitive() << '\n'; 26 std::cout << j_string.is_primitive() << '\n'; basic_json<> json default JSON class
Output (play with this example online): true
true
true
true
true
false
false
true
The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/is_primitive.cpp -o is_primitive
- See also
- is_structured() – returns whether JSON value is structured
-
is_null() – returns whether JSON value is
null
-
is_string() – returns whether JSON value is a string
-
is_boolean() – returns whether JSON value is a boolean
-
is_number() – returns whether JSON value is a number
- Since
- version 1.0.0
Definition at line 2269 of file json.hpp.
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