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Add note re ASSERT_STATIC_EXPR_ZERO()

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Behdad Esfahbod 2015-07-21 15:45:48 +01:00
parent d6adca9fbb
commit 366aeaad00
1 changed files with 2 additions and 0 deletions
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src/hb-private.hh
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@ -193,6 +193,8 @@ static inline unsigned int ARRAY_LENGTH (const Type (&)[n]) { return n; }
#define _ASSERT_STATIC0(_line, _cond) _ASSERT_STATIC1 (_line, (_cond))
#define ASSERT_STATIC(_cond) _ASSERT_STATIC0 (__LINE__, (_cond))
/* Note: C++ allows sizeof() of variable-lengh arrays. So, if _cond is not
* constant, it still compiles (ouch!), but at least we'll get a -Wvla warning. */
#define ASSERT_STATIC_EXPR_ZERO(_cond) (0 * sizeof (char[(_cond) ? 1 : -1]))
#define _PASTE1(a,b) a##b