Defined in header <memory> | ||
|---|---|---|
template< class T > void destroy_at( T* p ); | (since C++17) |
Calls the destructor of the object pointed to by p, as if by p->~T().
| p | - | a pointer to the object to be destroyed |
(none).
template<class T>
void destroy_at(T* p)
{
p->~T();
} |
The following example demonstrates how to use destroy_at to destroy a contiguous sequence of elements.
#include <memory>
#include <new>
#include <iostream>
struct Tracer {
int value;
~Tracer() { std::cout << value << " destructed\n"; }
};
int main()
{
alignas(Tracer) unsigned char buffer[sizeof(Tracer) * 8];
for (int i = 0; i < 8; ++i)
new(buffer + sizeof(Tracer) * i) Tracer{i}; //manually construct objects
auto ptr = std::launder(reinterpret_cast<Tracer*>(buffer));
for (int i = 0; i < 8; ++i)
std::destroy_at(ptr + i);
}Output:
0 destructed 1 destructed 2 destructed 3 destructed 4 destructed 5 destructed 6 destructed 7 destructed
|
(C++17) | destroys a range of objects (function template) |
|
(C++17) | destroys a number of objects in a range (function template) |
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