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made clear reset overflow bytes

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joaquintides
2022-10-17 17:51:43 +02:00
parent b0f6bb128f
commit 6b1d2f13da
1 changed files with 18 additions and 5 deletions
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23
include/boost/unordered/detail/foa.hpp
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@ -1364,11 +1364,24 @@ public:
void clear()noexcept
{
for_all_elements([&,this](group_type* pg,unsigned int n,value_type* p){
destroy_element(p);
pg->reset(n);
});
size_=0;
alignas(group_type) static constexpr unsigned char
zero[sizeof(group_type)]={0,};
auto p=arrays.elements;
if(p){
for(auto pg=arrays.groups,last=pg+arrays.groups_size_mask+1;
pg!=last;++pg,p+=N){
auto mask=pg->match_really_occupied();
while(mask){
destroy_element(p+unchecked_countr_zero(mask));
mask&=mask-1;
}
/* we wipe the entire metadata to reset the overflow byte as well */
*pg=*reinterpret_cast<const group_type*>(zero);
}
arrays.groups[arrays.groups_size_mask].set_sentinel();
size_=0;
}
}
// TODO: should we accept different allocator too?