class template
<type_traits>
std::remove_volatile
template <class T> struct remove_volatile;
Remove volatile qualification
Obtains the type T without top-level volatile qualification.
The transformed type is aliased as member type remove_volatile::type.
If T is volatile-qualified, this is the same type as T but with its volatile-qualification removed. Otherwise, it is T unchanged.
Notice that this class merely obtains a type using another type as model, but it does not transform values or objects between those types. To explicitly remove the volatile-qualifier of an object, const_cast can be used.
Template parameters
- T
- A type.
Member types
| member type | definition |
|---|
| type | If T is volatile-qualified, the same type as T but with the volatile-qualification removed.
Otherwise, T |
Example
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// remove_volatile example
#include <iostream>
#include <type_traits>
int main() {
typedef volatile int vint;
std::remove_volatile<vint>::type a; // int a
std::remove_volatile<const volatile int>::type b = 0; // const int b
std::remove_volatile<volatile int*>::type c; // volatile int* c
std::remove_volatile<int* volatile>::type d; // int* d
if (std::is_volatile<decltype(d)>::value)
std::cout << "type of d is volatile" << std::endl;
else
std::cout << "type of d is not volatile" << std::endl;
return 0;
}
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Output:
type of d is not volatile
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