is_signed template in C++
Last Updated :
19 Nov, 2018
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:
#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:
#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:
#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
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