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◆ is_binary()
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, class BinaryType = std::vector<std::uint8_t>>
constexpr bool nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::is_binary |
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This function returns true if and only if the JSON value is a binary array.
- Returns
true if type is binary array, false otherwise.
- Complexity^^ Constant.
- Exception safety^^ No-throw guarantee: this member function never throws
- exceptions.
- Example^^ The following code exemplifies is_binary() for all JSON
- types. ^^
2 #include <nlohmann/json.hpp> 10 json j_boolean = true; 11 json j_number_integer = 17; 12 json j_number_unsigned_integer = 12345678987654321u; 13 json j_number_float = 23.42; 14 json j_object = {{ "one", 1}, { "two", 2}}; 15 json j_array = {1, 2, 4, 8, 16}; 16 json j_string = "Hello, world"; 20 std::cout << std::boolalpha; 22 std::cout << j_boolean.is_binary() << '\n'; 23 std::cout << j_number_integer.is_binary() << '\n'; 24 std::cout << j_number_unsigned_integer.is_binary() << '\n'; 25 std::cout << j_number_float.is_binary() << '\n'; 26 std::cout << j_object.is_binary() << '\n'; 27 std::cout << j_array.is_binary() << '\n'; 28 std::cout << j_string.is_binary() << '\n'; 29 std::cout << j_binary.is_binary() << '\n'; basic_json<> json default JSON class
static basic_json binary(const typename binary_t::container_type &init) explicitly create a binary array (without subtype)
constexpr bool is_binary() const noexcept return whether value is a binary array
Output (play with this example online):^^ false
false
false
false
false
false
false
false
true
^^ The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/is_binary.cpp -o is_binary
- Since
- version 3.8.0
Definition at line 19117 of file json.hpp.
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