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

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

Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros (哋它亢++20)
Language support library
Concepts library (哋它亢++20)
Metaprogramming library (哋它亢++11)
Diagnostics library
General utilities library
Strings library
Containers library
Iterators library
Ranges library (哋它亢++20)
Algorithms library
Numerics library
Localizations library
Input/output library
Filesystem library (哋它亢++17)
Regular expressions library (哋它亢++11)
Concurrency support library (哋它亢++11)
Technical specifications
Symbols index
External libraries

Member functions
unique_ptr::unique_ptr
unique_ptr::~unique_ptr
unique_ptr::operator=
Modifiers
unique_ptr::release
unique_ptr::reset
unique_ptr::swap
Observers
unique_ptr::get
unique_ptr::get_deleter
unique_ptr::operator bool
unique_ptr::operator*unique_ptr::operator->
unique_ptr::operator[]
Non-member functions
make_uniquemake_unique_for_overwrite (哋它亢++14)(哋它亢++20)
operator==operator!=operator<operator>operator<=operator>=operator<=> (until 哋它亢++20)(哋它亢++20)
operator<< (哋它亢++20)
swap(std::unique_ptr)
Helper classes
hash<std::unique_ptr>

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

Notes

Example

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