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Diffstat (limited to 'include/c/qual/const/const.h')
| -rw-r--r-- | include/c/qual/const/const.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/c/qual/const/const.h b/include/c/qual/const/const.h new file mode 100644 index 0000000..adfe000 --- /dev/null +++ b/include/c/qual/const/const.h @@ -0,0 +1,41 @@ +// Copyright 2022 Alejandro Colomar <alx@kernel.org> +// SPDX-License-Identifier: LGPL-3.0-or-later WITH LGPL-3.0-linking-exception + + +#ifndef INCLUDE_C_QUAL_CONST_CONST_H_ +#define INCLUDE_C_QUAL_CONST_CONST_H_ + + +#include <assert.h> + +#include <c/qual/type/type.h> + + +#define c_is_const_p(p) \ +({ \ + auto p_ = &*(p); \ + const typeof(p_) q_; \ + \ + c_is_same_type(p_, q_); \ +}) + + +#define c_const_cast(t, p) \ +({ \ + static_assert(c_is_same_type(typeof(&*(p)), const t)); \ + (t) (p); \ +}) + + +#define c_const_generic_func(func, p, ...) \ +({ \ + auto p_ = (p); \ + const typeof(*p_) *cp_; \ + \ + cp_ = func(p_ __VA_OPT__(,) __VA_ARGS__); \ + \ + c_const_cast(typeof(p_), cp_); \ +}) + + +#endif // Header guard |