DEFER macro for C++

defer.hpp

#pragma once

template
<
  typename T
>
class defer
{
public:
  defer(T action)
    : action_{action}
  {
  }

  ~defer()
  {
    action_();
  }

private:
  T action_;
};

template
<
  typename T
>
defer<T> make_defer(T action)
{
  return defer<T>(action);
}

#define DEFER(...) \
  DEFER_IMPL_1(__LINE__, __VA_ARGS__)

#define DEFER_IMPL_1(LINE, ...) \
  DEFER_IMPL_2(LINE, __VA_ARGS__)

#define DEFER_IMPL_2(LINE, ...) \
  const auto defer_##LINE = make_defer([&](){__VA_ARGS__;})

Usage:

if(SDL_Init(SDL_INIT_VIDEO))
{
    return EXIT_FAILURE;
}

DEFER(SDL_Quit());

...

std::array<GLuint, 3> buffers;
glGenBuffers(buffers.size(), buffers.data());
DEFER(glDeleteBuffers(buffers.size(), buffers.data()));