std::unique_ptr::get_deleter

From cppreference.com
< cpplrm; | memorylrm; | unique ptr
Dynamic memory management
Uninitialized storage
(C++17)
Garbage collection support
Miscellaneous
(C++20)
(C++11)
(C++11)
C Library
Low level memory management
Deleter& get_deleter() noexcept;
(since C++11)
const Deleter& get_deleter() const noexcept;
(since C++11)

Returns the deleter object which would be used for destruction of the managed object.

Parameters

(none)

Return value

The stored deleter object.

Example

#include <iostream>
#include <memory>

struct Foo
{
    Foo() { std::cout << "Foo...\n"; }
    ~Foo() { std::cout << "~Foo...\n"; }
};

struct D
{
    void bar() { std::cout << "Call deleter D::bar()...\n"; }
    void operator()(Foo* p) const
    {
        std::cout << "Call delete for Foo object...\n";
        delete p;
    }
};

int main()
{
    std::unique_ptr<Foo, D> up(new Foo(), D());
    D& del = up.get_deleter();
    del.bar();
}

Output:

Foo...
Call deleter D::bar()...
Call delete for Foo object...
~Foo...