co_try.h

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#pragma once
 
#include "di/execution/algorithm/just.h"
#include "di/util/move.h"
#include "di/vocab/error/error.h"
 
#if __GNUC__ >= 13
// NOTE: GCC 13 thinks that calling DI_TRY() on a di::Result<int&> produces a dangling reference, because the result
// object gets destroyed before the reference is used. However, di::Result<int&> is essentially a pointer type, so this
// is not a problem. Unfortunately, since this occurs in a macro, this warning cannot be suppressed only inside this
// header file.
#pragma GCC diagnostic ignored "-Wdangling-reference"
#endif
 
#define DI_CO_TRY(...)                                           \
    __extension__({                                              \
        auto __result = (__VA_ARGS__);                           \
        if (!__result) {                                         \
            co_return di::util::move(__result).__try_did_fail(); \
        }                                                        \
        ::di::util::move(__result).__try_did_succeed();          \
    }).__try_move_out()
 
#if !defined(DI_NO_GLOBALS) && !defined(DI_NO_GLOBAL_CO_TRY)
#define CO_TRY DI_CO_TRY
#endif