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

From cppreference.net
C++
Memory management library
( exposition only* )
Allocators
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Memory resources
Uninitialized storage (until C++20)
( until C++20* )
( until C++20* )
( until C++20* )

Garbage collector support (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
std::unique_ptr
Deleter & get_deleter ( ) noexcept ;
(since C++11)
(constexpr since C++23)
const Deleter & get_deleter ( ) const noexcept ;
(since C++11)
(constexpr since C++23)

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

Contents

Parameters

(none)

Return value

The stored deleter object.

Example

Run this code 
#include <iostream>
#include <memory>
struct Foo
{
    Foo() { std::cout << "Foo() 0x" << std::hex << (void*)this << '\n'; }
    ~Foo() { std::cout << "~Foo() 0x" << std::hex << (void*)this << '\n'; }
};
struct D
{
    int number;
    void bar()
    {
        std::cout << "call D::bar(), my number is: " << std::dec << number << '\n';
    }
    void operator()(Foo* p) const
    {
        std::cout << "call deleter for Foo object 0x" << std::hex << (void*)p << '\n';
        delete p;
    }
};
int main()
{
    std::cout << "main start\n";
    std::unique_ptr<Foo, D> up1(new Foo(), D(42));
    D& del1 = up1.get_deleter();
    del1.bar();
    std::unique_ptr<Foo, D> up2(new Foo(), D(43));
    D& del2 = up2.get_deleter();
    auto* released = up2.release();
    del2(released);
    std::cout << "main end\n";
}

Output: 

main start
Foo() 0x0x90cc30
call D::bar(), my number is: 42
Foo() 0x0x90cc50
call deleter for Foo object 0x0x90cc50
~Foo() 0x0x90cc50
main end
call deleter for Foo object 0x0x90cc30
~Foo() 0x0x90cc30

See also

returns the deleter of specified type, if owned
(function template)