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It can be simple deleted_unique_ptr<Foo> foo(new Foo(), customdeleter); if customdeleter follows the convention (it returns void and accepts raw pointer as an argument). – VP.

Apr 28, 2016 · In this post I’ve shown you how to use custom deleters with C++ smart pointer: shared_ptr and unique_ptr. Those deleters can be used in all the places wher ‘normal’ delete ptr is not enough: when you wrap FILE* , some kind of a C style structure ( SDL_FreeSurface , free() , destroy_bitmap from Allegro library, etc).

Dec 13, 2015 · To do that, you have to create the shared_ptr for yourself by means of the right constructor. As an example of a constructor from the proposed list, you can use: template< class Y, class Deleter > shared_ptr( Y* ptr, Deleter d ); Thus, the code will be something like: auto ptr = std::shared_ptr(new MyClass{arg1, arg2}, myDeleter); Instead of:

Nov 11, 2021 · Therefore, when you need a smart pointer for a plain C++ object, use unique_ptr, and when you construct a unique_ptr, use the make_unique helper function. The following diagram illustrates the transfer of ownership between two unique_ptr instances.

Mar 31, 2020 · An std::unique_ptr is a smart pointer that exclusively manages the lifetime of an object. The managed object is deleted when the unique_ptr is destroyed. A unique_ptr can be declared and initialized with a user-provided custom deleter that …

Apr 13, 2020 · shared_ptr is a reference-counted smart pointer i.e. it can share ownership of a dynamically allocated object with other shared_ptr instances.

Dec 21, 2024 · void delete_underlying_ptr() { delete ptr; ptr = nullptr; } This is so simple that I question whether it needs to be a function. reset() performs its side-effects in a different order to standard unique-pointer, which is specified to delete only _after the …

Oct 14, 2014 · With shared_ptr you can use a custom deleter, like: auto fp = shared_ptr<FILE>( fopen("file.txt", "rt"), &fclose ); fprintf( fp.get(), "hello\n" ); and this will remember to fclose the file regardless of how the function exits.

Mar 21, 2024 · In polymorphic scenarios, when performing a dynamic_cast on a unique_ptr, if the memory for the unique_ptr is allocated using a custom allocator, especially one with a custom deleter, the deleter...