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Add bits::GetBit() and bits::SetBitToX().

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Yury Melnichek 2011-05-16 23:50:15 +02:00 • committed by Alex Zolotarev
parent 0c37391aa8
commit 05a661652c
1 changed files with 19 additions and 0 deletions
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19
base/bits.hpp
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@ -123,4 +123,23 @@ namespace bits
x = ((hi & 0xFFFF) << 16) | (lo & 0xFFFF);
y = (hi & 0xFFFF0000) | (lo >> 16);
}
// Returns 1 if bit is set and 0 otherwise.
inline uint8_t GetBit(void const * p, uint32_t offset)
{
uint8_t const * pData = static_cast<uint8_t const *>(p);
return (pData[offset >> 3] >> (offset & 7)) & 1;
}
inline void SetBitTo0(void * p, uint32_t offset)
{
uint8_t * pData = static_cast<uint8_t *>(p);
pData[offset >> 3] &= ~(1 << (offset & 7));
}
inline void SetBitTo1(void * p, uint32_t offset)
{
uint8_t * pData = static_cast<uint8_t *>(p);
pData[offset >> 3] |= (1 << (offset & 7));
}
}