is_unsigned template in C++
Last Updated :
19 Nov, 2018
The std::is_unsigned template of C++ STL is used to check whether the type is a unsigned arithmetic type or not. It returns a boolean value showing the same.
Syntax:
template <class T > struct is_unsigned;
Parameters: This template contains single parameter T (Trait class) to check whether T is a unsigned arithmetic type or not.
Return Value:This template returns a boolean value as shown below:
- True: if the type is a un-signed arithmetic type.
- False: if the type is a signed arithmetic type.
Below programs illustrate the std::is_unsigned template in C++ STL:
Program 1:
#include <iostream>
#include <type_traits>
using namespace std;
class gfg {
};
enum sam : unsigned {};
enum class raj : unsigned {};
int main()
{
cout << boolalpha;
cout << "is_unsigned:" << '\n' ;
cout << "unsigned int:"
<< is_unsigned<unsigned int >::value << '\n' ;
cout << "gfg:"
<< is_unsigned<gfg>::value << '\n' ;
cout << "sam:"
<< is_unsigned<sam>::value << '\n' ;
cout << "raj:"
<< is_unsigned<raj>::value << '\n' ;
return 0;
}
|
Output:
is_unsigned:
unsigned int:true
gfg:false
sam:false
raj:false
Program 2:
#include <iostream>
#include <type_traits>
using namespace std;
int main()
{
cout << boolalpha;
cout << "is_unsigned:" << '\n' ;
cout << "signed char:"
<< is_unsigned< signed char >::value << '\n' ;
cout << "unsigned char:"
<< is_unsigned<unsigned char >::value << '\n' ;
cout << "signed int:"
<< is_unsigned< signed int >::value << '\n' ;
return 0;
}
|
Output:
is_unsigned:
signed char:false
unsigned char:true
signed int:false
Program 3:
#include <iostream>
#include <type_traits>
using namespace std;
int main()
{
cout << boolalpha;
cout << "is_unsigned:" << '\n' ;
cout << "bool:"
<< is_unsigned< bool >::value << '\n' ;
cout << "float:"
<< is_unsigned< float >::value << '\n' ;
cout << "double:"
<< is_unsigned< double >::value << '\n' ;
return 0;
}
|
Output:
is_unsigned:
bool:true
float:false
double:false
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