Kelas is_volatile

Menguji apakah jenis volatil.

Sintaks

template <class Ty>
struct is_volatile;

Parameter

Ty
Jenis yang akan dikueri.

Keterangan

Instans predikat jenis memegang true jika Ty adalah volatile-qualified.

Contoh

// std__type_traits__is_volatile.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>

struct trivial
    {
    int val;
    };

int main()
    {
    std::cout << "is_volatile<trivial> == " << std::boolalpha
        << std::is_volatile<trivial>::value << std::endl;
    std::cout << "is_volatile<volatile trivial> == " << std::boolalpha
        << std::is_volatile<volatile trivial>::value << std::endl;
    std::cout << "is_volatile<int> == " << std::boolalpha
        << std::is_volatile<int>::value << std::endl;
    std::cout << "is_volatile<volatile int> == " << std::boolalpha
        << std::is_volatile<volatile int>::value << std::endl;

    return (0);
    }

is_volatile<trivial> == false
is_volatile<volatile trivial> == true
is_volatile<int> == false
is_volatile<volatile int> == true

Persyaratan

Header:<type_traits>

Namespace: std

Lihat juga

<type_traits>
Kelas is_const