is_unsigned Class
The latest version of this topic can be found at is_unsigned Class.
Tests if type is unsigned integer.
Syntax
template <class Ty>
struct is_unsigned;
Parameters
Ty
The type to query.
Remarks
An instance of the type predicate holds true if the type Ty is an unsigned integral type or a cv-qualified unsigned integral type, otherwise it holds false.
Example
// std_tr1__type_traits__is_unsigned.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
int main()
{
std::cout << "is_unsigned<trivial> == " << std::boolalpha
<< std::is_unsigned<trivial>::value << std::endl;
std::cout << "is_unsigned<int> == " << std::boolalpha
<< std::is_unsigned<int>::value << std::endl;
std::cout << "is_unsigned<unsigned int> == " << std::boolalpha
<< std::is_unsigned<unsigned int>::value << std::endl;
std::cout << "is_unsigned<float> == " << std::boolalpha
<< std::is_unsigned<float>::value << std::endl;
return (0);
}
is_unsigned<trivial> == false
is_unsigned<int> == false
is_unsigned<unsigned int> == true
is_unsigned<float> == false
Requirements
Header: <type_traits>
Namespace: std