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BAN: Add {TRY,MUST}_REF for references 

It is annoying that we have to have separate macros for these but
I can't find a way to cleanly return lvalue reference from statement
expression. Currently we cast the reference to pointer and return
unreference the pointer outside of the expression.

This feature will probably not be used any time soon, but atleas
it is implemented if I need it one day
This commit is contained in:
Bananymous 2023-04-19 00:29:16 +03:00
parent 121f4bc1dd
commit 3ca623349a
1 changed files with 6 additions and 3 deletions
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9
BAN/include/BAN/Errors.h
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@ -9,12 +9,15 @@
#if defined(__is_kernel)
#include <kernel/Panic.h>
#include <kernel/Errors.h>
#define MUST(expr) ({ auto&& e = expr; if (e.is_error()) Kernel::panic("{}", e.error()); e.release_value(); })
#define MUST(expr) ({ auto&& e = expr; if (e.is_error()) Kernel::panic("{}", e.error()); e.release_value(); })
#define MUST_REF(expr) *({ auto&& e = expr; if (e.is_error()) Kernel::panic("{}", e.error()); &e.release_value(); })
#else
#define MUST(expr) ({ auto&& e = expr; assert(!e.is_error()); e.release_value(); })
#define MUST(expr) ({ auto&& e = expr; assert(!e.is_error()); e.release_value(); })
#define MUST_REF(expr) *({ auto&& e = expr; assert(!e.is_error()); &e.release_value(); })
#endif
#define TRY(expr) ({ auto&& e = expr; if (e.is_error()) return e.release_error(); e.release_value(); })
#define TRY(expr) ({ auto&& e = expr; if (e.is_error()) return e.release_error(); e.release_value(); })
#define TRY_REF(expr) *({ auto&& e = expr; if (e.is_error()) return e.release_error(); &e.release_value(); })
namespace BAN
{