NAME¶

std::unique_ptr::~unique_ptr - std::unique_ptr::~unique_ptr

Synopsis¶

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

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¶

The following program demonstrates usage of a custom deleter.

// Run this code

#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");
}

Output:¶

not empty
[deleter called]
empty