C++ STL 的 std::is_arithmetic 模板用於檢查給定類型是否為算術類型。算術類型意味著整數類型或浮點類型。它返回一個顯示相同的布爾值。
用法:
template <class T> struct is_arithmetic;
參數:此模板接受單個參數 T(Trait 類)來檢查 T 是否為算術類型。
返回值:此模板返回一個布爾值,如下所示:
- True:如果類型是算術。
- False:如果類型是非算術。
以下示例程序旨在說明 C++ STL 中的 std::is_arithmetic 模板:
程序1::
// C++ program to illustrate
// is_arithmetic template
#include <iostream>
#include <type_traits>
using namespace std;
// main program
class GFG {
};
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "GFG:"
<< is_arithmetic<GFG>::value << '\n';
cout << "bool:"
<< is_arithmetic<bool>::value << '\n';
cout << "long:"
<< is_arithmetic<long>::value << '\n';
cout << "short:"
<< is_arithmetic<short>::value << '\n';
return 0;
}
輸出:
is_arithmetic: GFG:false bool:true long:true short:true
程序2::
// C++ program to illustrate
// is_arithmetic template
#include <iostream>
#include <type_traits>
using namespace std;
// main program
class GFG {
};
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "GFG:"
<< is_arithmetic<GFG>::value << '\n';
cout << "int:"
<< is_arithmetic<int>::value << '\n';
cout << "int const:"
<< is_arithmetic<int const>::value << '\n';
cout << "int &:"
<< is_arithmetic<int&>::value << '\n';
cout << "int *:"
<< is_arithmetic<int*>::value << '\n';
cout << "long int:"
<< is_arithmetic<long int>::value << '\n';
return 0;
}
輸出:
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 <iostream>
#include <type_traits>
using namespace std;
// main program
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "float:"
<< is_arithmetic<float>::value << '\n';
cout << "float const:"
<< is_arithmetic<float const>::value << '\n';
cout << "float &:"
<< is_arithmetic<float&>::value << '\n';
cout << "float *:"
<< is_arithmetic<float*>::value << '\n';
cout << "double:"
<< is_arithmetic<double>::value << '\n';
cout << "double const:"
<< is_arithmetic<double const>::value << '\n';
cout << "double &:"
<< is_arithmetic<double&>::value << '\n';
cout << "double *:"
<< is_arithmetic<double*>::value << '\n';
return 0;
}
輸出:
is_arithmetic: float:true float const:true float &:false float *:false double:true double const:true double &:false double *:false
程序4::
// C++ program to illustrate
// is_arithmetic template
#include <iostream>
#include <type_traits>
using namespace std;
// main program
int main()
{
cout << boolalpha;
cout << "is_arithmetic:" << '\n';
cout << "char:"
<< is_arithmetic<char>::value << '\n';
cout << "char const:"
<< is_arithmetic<char const>::value << '\n';
cout << "char &:"
<< is_arithmetic<char&>::value << '\n';
cout << "char *:"
<< is_arithmetic<char*>::value << '\n';
return 0;
}
輸出:
is_arithmetic: char:true char const:true char &:false char *:false
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