C++ STL的std :: is_floating_point模板用于检查给定类型是否为浮点值。它返回一个显示相同值的布尔值。
句法:
template < class T > struct is_floating_point;
参数:此模板接受单个参数T(Trait类),以检查T是否为浮点类型。
返回值:该模板返回一个布尔值,如下所示:
- 正确:如果类型是浮点型。
- False:如果类型是非浮点型值。
下面的程序说明了C++ STL中的std :: is_floating_point模板:
程序1:
// C++ program to illustrate
// std::is_floating_point template
#include
#include
using namespace std;
// main program
int main()
{
cout << std::boolalpha;
cout << "is_floating_point:" << endl;
cout << "char: "
<< is_floating_point::value
<< endl;
cout << "int: "
<< is_floating_point::value
<< endl;
cout << "float: "
<< is_floating_point::value
<< endl;
return 0;
}
输出:
is_floating_point:
char: false
int: false
float: true
程式2:
// C++ program to illustrate
// std::is_floating_point template
#include
#include
using namespace std;
// main program
int main()
{
cout << std::boolalpha;
cout << "is_floating_point:" << endl;
cout << "double: "
<< is_floating_point::value
<< endl;
cout << "bool: "
<< is_floating_point::value
<< endl;
cout << "long int: "
<< is_floating_point::value
<< endl;
return 0;
}
输出:
is_floating_point:
double: true
bool: false
long int: false
程序3:
// C++ program to illustrate
// std::is_floating_point function
#include
#include
using namespace std;
// main program
int main()
{
cout << boolalpha;
cout << "is_floating_point:" << endl;
cout << "wchar_t: "
<< is_floating_point::value
<< endl;
cout << "long double: "
<< is_floating_point::value
<< endl;
cout << "unsigned short int: "
<< is_floating_point::value
<< endl;
return 0;
}
输出:
is_floating_point:
wchar_t: false
long double: true
unsigned short int: false
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