| description | Learn more about: is_signed Class | ||
|---|---|---|---|
| title | is_signed Class | ||
| ms.date | 11/04/2016 | ||
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| ms.assetid | 20ae44d9-22ad-4fbd-b26a-f18c62689451 |
Test if type is signed integer.
template <class Ty>
struct is_signed;Ty
The type to query.
An instance of the type predicate holds true if the type Ty is a signed integral type or a cv-qualified signed integral type, otherwise it holds false.
// std__type_traits__is_signed.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
int main()
{
std::cout << "is_signed<trivial> == " << std::boolalpha
<< std::is_signed<trivial>::value << std::endl;
std::cout << "is_signed<int> == " << std::boolalpha
<< std::is_signed<int>::value << std::endl;
std::cout << "is_signed<unsigned int> == " << std::boolalpha
<< std::is_signed<unsigned int>::value << std::endl;
std::cout << "is_signed<float> == " << std::boolalpha
<< std::is_signed<float>::value << std::endl;
return (0);
}is_signed<trivial> == false
is_signed<int> == true
is_signed<unsigned int> == false
is_signed<float> == true
Header: <type_traits>
Namespace: std