C++ STL的std :: is_arithmetic模板用于检查给定类型是否为算术类型。算术类型是指整数类型或浮点类型。它返回一个显示相同值的布尔值。
语法:
template struct is_arithmetic;
参数:该模板接受单个参数T(Trait类),以检查T是否为算术类型。
返回值:该模板返回一个布尔值,如下所示:
- True :如果类型是算术运算符。
- False :如果类型是非算术类型。
下面的程序说明了C++ STL中的std :: is_arithmetic模板:
程序1 :
// C++ program to illustrate
// is_arithmetic template
#include
#include
using namespace std;
// main program
class GFG {
};
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "GFG: "
<< is_arithmetic::value << '\n';
cout << "bool: "
<< is_arithmetic::value << '\n';
cout << "long: "
<< is_arithmetic::value << '\n';
cout << "short: "
<< is_arithmetic::value << '\n';
return 0;
}
输出:
is_arithmetic:
GFG: false
bool: true
long: true
short: true
程序2 :
// C++ program to illustrate
// is_arithmetic template
#include
#include
using namespace std;
// main program
class GFG {
};
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "GFG: "
<< is_arithmetic::value << '\n';
cout << "int: "
<< is_arithmetic::value << '\n';
cout << "int const: "
<< is_arithmetic::value << '\n';
cout << "int &: "
<< is_arithmetic::value << '\n';
cout << "int *: "
<< is_arithmetic::value << '\n';
cout << "long int: "
<< is_arithmetic::value << '\n';
return 0;
}
输出:
is_arithmetic:
GFG: false
int: true
int const: true
int &: false
int *: false
long int: true
程序3 :
// C++ program to illustrate
// is_arithmetic template
#include
#include
using namespace std;
// main program
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "float: "
<< is_arithmetic::value << '\n';
cout << "float const: "
<< is_arithmetic::value << '\n';
cout << "float &: "
<< is_arithmetic::value << '\n';
cout << "float *: "
<< is_arithmetic::value << '\n';
cout << "double: "
<< is_arithmetic::value << '\n';
cout << "double const: "
<< is_arithmetic::value << '\n';
cout << "double &: "
<< is_arithmetic::value << '\n';
cout << "double *: "
<< is_arithmetic::value << '\n';
return 0;
}
输出:
is_arithmetic:
float: true
float const: true
float &: false
float *: false
double: true
double const: true
double &: false
double *: false
计划4 :
// C++ program to illustrate
// is_arithmetic template
#include
#include
using namespace std;
// main program
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "char: "
<< is_arithmetic::value << '\n';
cout << "char const: "
<< is_arithmetic::value << '\n';
cout << "char &: "
<< is_arithmetic::value << '\n';
cout << "char *: "
<< is_arithmetic::value << '\n';
return 0;
}
输出:
is_arithmetic:
char: true
char const: true
char &: false
char *: false
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