diff options
author | René Scharfe <l.s.r@web.de> | 2023-01-02 00:14:12 +0300 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2023-01-09 07:28:36 +0300 |
commit | d2ec87a684e2f9cd1f0c653620a00d74ad5ee2ce (patch) | |
tree | 911771cac3baaba2780b0bed60d9c0324e0d4284 /git-compat-util.h | |
parent | 08e8c266653a486cc441ec031136875bf579f054 (diff) |
add DUP_ARRAY
Add a macro for allocating and populating a shallow copy of an array.
It is intended to replace a sequence like this:
ALLOC_ARRAY(dst, n);
COPY_ARRAY(dst, src, n);
With the less repetitve:
DUP_ARRAY(dst, src, n);
It checks whether the types of source and destination are compatible to
ensure the copy can be used safely.
An easier alternative would be to only consider the source and return
a void pointer, that could be used like this:
dst = ARRAY_DUP(src, n);
That would be more versatile, as it could be used in declarations as
well. Making it type-safe would require the use of typeof_unqual from
C23, though.
So use the safe and compatible variant for now.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'git-compat-util.h')
-rw-r--r-- | git-compat-util.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h index e81bb14fc9..44abb240ae 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -1115,6 +1115,11 @@ static inline void move_array(void *dst, const void *src, size_t n, size_t size) memmove(dst, src, st_mult(size, n)); } +#define DUP_ARRAY(dst, src, n) do { \ + size_t dup_array_n_ = (n); \ + COPY_ARRAY(ALLOC_ARRAY((dst), dup_array_n_), (src), dup_array_n_); \ +} while (0) + /* * These functions help you allocate structs with flex arrays, and copy * the data directly into the array. For example, if you had: |