class template
<type_traits>
std::is_trivially_destructible
template <class T> struct is_trivially_destructible;
Is trivially destructible
Trait class that identifies whether T is a trivially destructible type.
Trivially destructible types include scalar types, trivially copy constructible classes and arrays of such types.
A trivially destructible class is a class (defined with class, struct or union) that:
- uses the implicitly defined destructor.
- the destructor is not virtual.
- its base class and non-static data members (if any) are themselves also trivially destructible types.
The is_trivially_destructible class inherits from integral_constant as being either true_type or false_type, depending on whether T is trivially destructible.
Template parameters
- T
- A complete type, or void (possible cv-qualified), or an array of unknown bound.
Member constants
Inherited from integral_constant:
| member constant | definition |
|---|
| value | either true or false |
Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
// is_trivially_destructible example
#include <iostream>
#include <type_traits>
struct A { };
struct B { ~B(){} };
int main() {
std::cout << std::boolalpha;
std::cout << "is_trivially_destructible:" << std::endl;
std::cout << "int: " << std::is_trivially_destructible<int>::value << std::endl;
std::cout << "A: " << std::is_trivially_destructible<A>::value << std::endl;
std::cout << "B: " << std::is_trivially_destructible<B>::value << std::endl;
return 0;
}
|
Output:
is_trivially_destructible:
int: true
A: true
B: false
|