JSON for Modern C++ 3.9.1

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~basic_json
| ## ◆ is_string() 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_string | ( |  | ) | const
| inline constexpr noexcept
  This function returns true if and only if the JSON value is a string. Returns `true` if type is string, `false` otherwise. Complexity Constant. Exception safety No-throw guarantee: this member function never throws exceptions. Example The following code exemplifies `is_string()` for all JSON types. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json j_null; 10 json j_boolean = true; 11 json j_number_integer = 17; 12 json j_number_float = 23.42; 13 json j_number_unsigned_integer = 12345678987654321u; 14 json j_object = {{"one", 1}, {"two", 2}}; 15 json j_array = {1, 2, 4, 8, 16}; 16 json j_string = "Hello, world"; 17 json j_binary = json::binary({1, 2, 3}); 18 19 // call is_string() 20 std::cout << std::boolalpha; 21 std::cout << j_null.is_string() << '\n'; 22 std::cout << j_boolean.is_string() << '\n'; 23 std::cout << j_number_integer.is_string() << '\n'; 24 std::cout << j_number_unsigned_integer.is_string() << '\n'; 25 std::cout << j_number_float.is_string() << '\n'; 26 std::cout << j_object.is_string() << '\n'; 27 std::cout << j_array.is_string() << '\n'; 28 std::cout << j_string.is_string() << '\n'; 29 std::cout << j_binary.is_string() << '\n'; 30 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:3385 Output (play with this example online):
      false
      false
      false
      false
      false
      false
      false
      true
      false
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/is_string.cpp -o is_string
Since version 1.0.0 Definition at line 19713 of file json.hpp.