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~basic_json
| 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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
bool nlohmann::basic_json::is_number_integer | ( |  | ) | const
| inlinenoexcept
  This function returns true iff the JSON value is an integer number. This excludes floating-point values. Returns `true` if type is an integer number, `false` otherwise. Complexity Constant. Example The following code exemplifies is_number_integer for all JSON types. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create JSON values 8 json j_null; 9 json j_boolean = true; 10 json j_number_integer = 17; 11 json j_number_float = 23.42; 12 json j_object = {{"one", 1}, {"two", 2}}; 13 json j_array = {1, 2, 4, 8, 16}; 14 json j_string = "Hello, world"; 15 16 // call is_number_integer() 17 std::cout << std::boolalpha; 18 std::cout << j_null.is_number_integer() << '\n'; 19 std::cout << j_boolean.is_number_integer() << '\n'; 20 std::cout << j_number_integer.is_number_integer() << '\n'; 21 std::cout << j_number_float.is_number_integer() << '\n'; 22 std::cout << j_object.is_number_integer() << '\n'; 23 std::cout << j_array.is_number_integer() << '\n'; 24 std::cout << j_string.is_number_integer() << '\n'; 25 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:130 nlohmann::basic_json::is_number_integer bool is_number_integer() const noexcept return whether value is an integer number Definition: json.hpp:1827 nlohmann namespace for Niels Lohmann Definition: json.hpp:55 Output (play with this example online):
      false
      false
      true
      false
      false
      false
      false
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/is_number_integer.cpp -o is_number_integer