How to use C++ standard smart pointers with Windows HANDLEs?

Question

I was wondering if there is a way to use unique_ptr with Windows HANDLEs?

I was thinking to replace the std::default_delete with s

Answer 1

Here is a handy little "custom_ptr" I use for dealing with a HANDLE. C++17 is required in order for this to compile. This idea was lifted from another SO post, I only added the std::remove_pointer_t so that I wouldn't have to pass void as the custom_ptr type parameter.

Definition

#include 
#include 

template
using deleter_from_fn = std::integral_constant;

template
using custom_ptr = std::unique_ptr, deleter_from_fn>;

Use

custom_ptr phandle{
    CreateFileMapping( INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, 1024, L"FileName" ) };