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.
T value of std::numeric_limits<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 [edit] Example
#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-specialized")
<< " : "
<< (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[edit] See also checks if a type is a signed arithmetic type
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