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