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std::unique_ptr<T,Deleter>::~unique_ptr

Since C++11
~unique_ptr();
Since C++23
constexpr ~unique_ptr();

If get() == nullptr there are no effects. Otherwise, the owned object is destroyed via get_deleter()(get()).

Requires that get_deleter()(get()) does not throw exceptions.

Notes

Although std::unique_ptr<T> with the default deleter may be constructed with incomplete type T, the type T must be complete at the point of code where the destructor is called.

Example

#include <iostream>
#include <memory>

int main ()
{
auto deleter = [](int* ptr){
std::cout
<< "[deleter called]\n";
delete ptr;
};

std::unique_ptr<int,decltype(deleter)> uniq(new int, deleter);
std::cout
<< (uniq ? "not empty\n" : "empty\n");
uniq.reset();
std::cout
<< (uniq ? "not empty\n" : "empty\n");
}

Result
not empty
[deleter called]
empty

std::unique_ptr<T,Deleter>::~unique_ptr

Since C++11
~unique_ptr();
Since C++23
constexpr ~unique_ptr();

If get() == nullptr there are no effects. Otherwise, the owned object is destroyed via get_deleter()(get()).

Requires that get_deleter()(get()) does not throw exceptions.

Notes

Although std::unique_ptr<T> with the default deleter may be constructed with incomplete type T, the type T must be complete at the point of code where the destructor is called.

Example

#include <iostream>
#include <memory>

int main ()
{
auto deleter = [](int* ptr){
std::cout
<< "[deleter called]\n";
delete ptr;
};

std::unique_ptr<int,decltype(deleter)> uniq(new int, deleter);
std::cout
<< (uniq ? "not empty\n" : "empty\n");
uniq.reset();
std::cout
<< (uniq ? "not empty\n" : "empty\n");
}

Result
not empty
[deleter called]
empty