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More generic hash function for FSM

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The hash function introduced in 6faf704731 doesn't work on 32 bit
systems. This one should.

Accepted By: @vladislavbelov
Differential Revision: https://code.wildfiregames.com/D5237
This was SVN commit r28033.
This commit is contained in:
phosit 2024-02-16 17:31:40 +00:00
parent c1d7ac6182
commit 483da49759
1 changed files with 4 additions and 4 deletions
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8
source/network/FSM.h
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@ -170,10 +170,10 @@ private:
{
size_t operator()(const TransitionKey& key) const noexcept
{
static_assert(sizeof(UnderlyingType) <= sizeof(size_t) / 2);
return (static_cast<size_t>(key.state) <<
((sizeof(size_t) / 2) * std::numeric_limits<unsigned char>::digits)) +
static_cast<size_t>(key.eventType);
constexpr size_t count{std::numeric_limits<size_t>::digits / 2};
const size_t wideState{static_cast<size_t>(key.state)};
const size_t rotatedState{(wideState << count) | (wideState >> count)};
return static_cast<size_t>(key.eventType) ^ rotatedState;
}
};