1#pragma once
 2
 3#include <utility>
 4#include <type_traits>
 5
 6template <typename Fn>
 7struct on_scope_exit {
 8    static_assert(std::is_nothrow_move_constructible<Fn>::value,
 9        "Fn must be nothrow move constructible");
10
11    explicit on_scope_exit(Fn&& fn) noexcept
12        : _fn(std::move(fn)) {};
13    on_scope_exit(const on_scope_exit&) = delete;
14    on_scope_exit& operator=(const on_scope_exit&) = delete;
15    ~on_scope_exit() noexcept {
16        this->_fn();
17    }
18
19  private:
20    Fn _fn;
21};