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Make atomic_queue constexpr functions compliant to C++11

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This commit is contained in:
Jean Pierre Cimalando 2020-05-02 11:35:14 +02:00
parent 7710282bd0
commit 65eb564222
1 changed files with 9 additions and 5 deletions
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14
src/external/atomic_queue/atomic_queue.h vendored
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@ -55,12 +55,17 @@ struct GetIndexShuffleBits<false, array_size, elements_per_cache_line> {
// the element within the cache line) with the next N bits (which are the index of the cache line)
// of the element index.
template<int BITS>
constexpr unsigned remap_index(unsigned index) noexcept {
constexpr unsigned MASK = (1u << BITS) - 1;
unsigned mix = (index ^ (index >> BITS)) & MASK;
constexpr unsigned remap_index_with_mix(unsigned index, unsigned mix)
{
return index ^ mix ^ (mix << BITS);
}
template<int BITS>
constexpr unsigned remap_index(unsigned index) noexcept {
return remap_index_with_mix<BITS>(
index, (index ^ (index >> BITS)) & ((1u << BITS) - 1));
}
template<>
constexpr unsigned remap_index<0>(unsigned index) noexcept {
return index;
@ -68,8 +73,7 @@ constexpr unsigned remap_index<0>(unsigned index) noexcept {
template<int BITS, class T>
constexpr T& map(T* elements, unsigned index) noexcept {
index = remap_index<BITS>(index);
return elements[index];
return elements[remap_index<BITS>(index)];
}
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