std::numeri...::is_signed(3) C++ Standard Libary std::numeri...::is_signed(3) NAME std::numeric_limits::is_signed - std::numeric_limits::is_signed Synopsis static const bool is_signed; (until C++11) static constexpr bool is_signed; (since C++11) The value of std::numeric_limits<T>::is_signed is true for all signed arithmetic types T and false for the unsigned types. This constant is meaningful for all specializations. Standard specializations T value of std::numeric_lim- its<T>::is_signed /* non-specialized */ false bool false char implementation-defined signed char true unsigned char false wchar_t implementation-defined char8_t (since C++20) false char16_t (since C++11) false char32_t (since C++11) false short true unsigned short false int true unsigned int false long true unsigned long false long long (since C++11) true unsigned long long (since C++11) false float true double true long double true Example // Run this code #include <iostream> #include <iomanip> #include <limits> template<typename T> struct test { test(const char* name, int w = 15) { std::cout << std::left << std::setw(w) << (std::numeric_limits<T>::is_specialized ? name : "non-spe- cialized") << " : " << (std::numeric_limits<T>::is_signed ? "" : "un") << "signed\n"; } }; int main() { test<bool>{"bool"}; test<char>{"char"}; test<wchar_t>{"wchar_t"}; test<char16_t>{"char16_t"}; test<char32_t>{"char32_t"}; test<float>{"float"}; struct delusion{}; test<delusion>{"delusion"}; test<decltype(42)>{"decltype(42)"}; } Possible output: bool : unsigned char : signed wchar_t : signed char16_t : unsigned char32_t : unsigned float : signed non-specialized : unsigned decltype(42) : signed See also is_signed checks if a type is a signed arithmetic type (C++11) (class template) is_integer identifies integer types [static] (public static member constant) is_exact identifies exact types [static] (public static member constant) is_bounded identifies types that represent a finite set of values [static] (public static member constant) http://cppreference.com 2024.06.10 std::numeri...::is_signed(3)
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