cpp-scope-guard/include/scope_guard/scope_guard.hpp

//
//  scope_guard.hpp
//  memory
//
//  Created by Sam Jaffe on 9/24/15.
//
//

#pragma once

#include <functional>

struct scope_exit {
  template <typename F> scope_exit(F f) : _f(f) {}
  ~scope_exit() noexcept { _f(); }
  std::function<void()> _f;
};

#if __cplusplus > 201402L
template <bool B>
struct scope_exception {
  template <typename F> scope_exception(F f) : _f(f), _except(std::uncaught_exceptions()) {}
  ~scope_exception() noexcept(B) { if (B == (std::uncaught_exceptions() > _except)) _f(); }
  std::function<void()> _f;
  int const _except;
};

using scope_failure = scope_exception<true>;
using scope_success = scope_exception<false>;
#endif

#define CONCAT2(A, B) A##B
#define CONCAT(A, B) CONCAT2(A, B)
#define scope(t) scope_##t CONCAT(inline_scope_guard_##t##_,__LINE__) = [&]()
#define scope_guard(t, f) scope_##t CONCAT(scope_guard_##t##_,__LINE__){f};