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C++ is_arithmetic用法及代码示例


C++ STL 的 std::is_arithmetic 模板用于检查给定类型是否为算术类型。算术类型意味着整数类型或浮点类型。它返回一个显示相同的布尔值。

用法

template <class T> struct is_arithmetic;

参数:此模板接受单个参数 T(Trait 类)来检查 T 是否为算​​术类型。

返回值:此模板返回一个布尔值,如下所示:

  • True:如果类型是算术。
  • False:如果类型是非算术。

以下示例程序旨在说明 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;
}
输出:
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;
}
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 <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;
}
输出:
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;
}
输出:
is_arithmetic:
char:true
char const:true
char &:false
char *:false



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注:本文由纯净天空筛选整理自rajasethupathi大神的英文原创作品 is_arithmetic Template in C++。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。