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Fix build error in BitSet getHash when building with MSVC #229

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Fix build error in BitSet getHash when building with MSVC #229

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11 changes: 5 additions & 6 deletions src/core/util/BitSet.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -233,12 +233,11 @@ int32_t BitSet::hashCode() {
// Start with a zero hash and use a mix that results in zero if the input is zero.
// This effectively truncates trailing zeros without an explicit check.
int64_t hash = 0;
to_block_range(bitSet, boost::make_function_output_iterator(
[&hash](bitset_type::block_type block) {
hash ^= block;
hash = (hash << 1) | (hash >> 63); // rotate left
}
));
auto computeHash = [&hash](bitset_type::block_type block) {
hash ^= block;
hash = (hash << 1) | (hash >> 63); // rotate left
};
to_block_range(bitSet, boost::make_function_output_iterator(std::ref(computeHash)));
// Fold leftmost bits into right and add a constant to prevent empty sets from
// returning 0, which is too common.
return (int32_t)((hash >> 32) ^ hash) + 0x98761234;
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