#ifndef MAG_DEFER_H
#define MAG_DEFER_H
/**
 * Zig-like defer macro for (gc)C and C++
 *
 * Based on:
 * https://gustedt.wordpress.com/2025/01/06/simple-defer-ready-to-use/
 * - but works with gcc(C), g++ and non-gcc c++ compilers.
 * - so it only does not work for other C compilers.
 *
 * Rem.: This [[gnu::always_inline]]
 *       basically means __attribute__((always_inline))
 */

#ifdef __cplusplus
template<typename T>
struct __df_st  : T {
  [[gnu::always_inline]]
  inline
  __df_st(T g) : T(g) {
    // empty
  }
  [[gnu::always_inline]]
  inline
  ~__df_st() {
    T::operator()();
  }
};
#define __DEFER__(V)  __df_st const V = [&](void)->void
#define defer __DEFER(__COUNTER__)
#define __DEFER(N) __DEFER_(N)
#define __DEFER_(N) __DEFER__(__DEFER_VARIABLE_ ## N)

#else

#define __DEFER__(F, V) \
  [[gnu::always_inline]] inline auto void F(int*); \
  [[gnu::cleanup(F)]] int V; \
  [[gnu::always_inline]] inline auto void F(int*)
#define defer __DEFER(__COUNTER__)
#define __DEFER(N) __DEFER_(N)
#define __DEFER_(N) __DEFER__(__DEFER_FUNCTION_ ## N, __DEFER_VARIABLE_ ## N)
#endif /* __cplusplus */

#endif /* MAG_DEFER_H */