template <class T> struct is_integral;

// C++程序例示
// is_integral函数
  
#include <iostream>
#include <type_traits>
using namespace std;
  
// 主程序
int main()
{
    cout << boolalpha;
    cout << "is_integral：" << endl;
    cout << "char：" << is_integral
       <char>::value << endl;
    cout << "int：" << is_integral
       <int>::value << endl;
    cout << "float：" << is_integral
        <float>::value << endl;
    return 0;
}

is_integral：
char：真
int：真
float：假

// C++程序例示
// is_integral函数
  
#include <iostream>
#include <type_traits>
using namespace std;
  
// 主程序
int main()
{
    cout << boolalpha;
    cout << "is_integral：" << endl;
    cout << "double：" << is_integral
      <double>::value << endl;
    cout << "bool：" << is_integral
       <bool>::value << endl;
    cout << "long int：" << is_integral
        <long int>::value << endl;
    return 0;
}

is_integral：
double：假
bool：真
long int：真

// C++程序例示
// is_integral函数
  
#include <iostream>
#include <type_traits>
using namespace std;
  
// 主程序
int main()
{
    cout << boolalpha;
    cout << "is_integral：" << endl;
    cout << "wchar_t：" << is_integral
      <wchar_t>::value << endl;
    cout << "long double：" << is_integral
      <long double>::value << endl;
    cout << "unsigned short int：" << is_integral
      <unsigned short int>::value<< endl;
    return 0;
}

is_integral：
wchar_t：真
long double：假
unsigned short int：真