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better ARRAY_SIZE macro that refuses to compile when passed a pointer.

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this prevents bugs along the lines of the recently reported
StringStripper issue.

This was SVN commit r5381.
This commit is contained in:
janwas
2007-10-01 19:12:59 +00:00
parent 89bf2e609a
commit 8a92304b25
1 changed files with 13 additions and 2 deletions
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source/lib/lib.h
+13 -2
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@@ -57,8 +57,19 @@ const size_t MiB = 1ul << 20;
const size_t GiB = 1ul << 30;
/// number of array elements
#define ARRAY_SIZE(name) (sizeof(name) / sizeof(name[0]))
//
// number of array elements
//
// (function taking a reference to an array and returning a pointer to
// an array of characters. it's only declared and never defined; we just
// need it to determine n, the size of the array that was passed.)
template<typename T, size_t n> char (*ArraySizeDeducer(T (&)[n]))[n];
// (although requiring C++, this method is much better than the standard
// sizeof(name) / sizeof(name[0]) because it doesn't compile when a
// pointer is passed, which can easily happen under maintenance.)
#define ARRAY_SIZE(name) (sizeof(*ArraySizeDeducer(name)))
//-----------------------------------------------------------------------------