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C++ is_arithmetic用法及代碼示例


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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注:本文由純淨天空篩選整理自rajasethupathi大神的英文原創作品 is_arithmetic Template in C++。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。