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(svn r19788) -Codechange: make FOR_EACH_SET_BIT not change the value of the passed bit variable, i.e. allow expressions as parameter

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rubidium
2010-05-11 20:48:06 +00:00
parent 26bf9a13de
commit be504a6ef0
5 changed files with 12 additions and 14 deletions
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12
src/core/bitmath_func.hpp
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@@ -310,16 +310,18 @@ static FORCEINLINE T ROR(const T x, const uint8 n)
* Do an operation for each set set bit in a value.
*
* This macros is used to do an operation for each set
* bit in a variable. The first variable can be reused
* in the operation due to it's the bit position counter.
* The second variable will be cleared during the usage
* bit in a variable. The first parameter is a variable
* that is used as the bit position counter.
* The second parameter is an expression of the bits
* we need to iterate over. This expression will be
* evaluated once.
*
* @param i The position counter
* @param b The value which we check for set bits
*/
#define FOR_EACH_SET_BIT(i, b) \
for (i = 0; b != 0; i++, b >>= 1) \
if (b & 1)
for (uint __FESB_bits = (i = 0, b); __FESB_bits != 0; i++, __FESB_bits >>= 1) \
if (__FESB_bits & 1)
#if defined(__APPLE__)