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Add to_pointer helper for converting raw pointers to fancy

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This helps us avoid an unconditional nullptr check when the user's pointer type is fancy
This commit is contained in:
Christian Mazakas
2023-09-07 08:33:33 -07:00
parent 675e30bd95
commit 771943e291
1 changed files with 19 additions and 13 deletions
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32
include/boost/unordered/detail/foa/table.hpp
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@ -133,22 +133,28 @@ private:
template<typename> friend class table_erase_return_type;
template<typename,typename,typename,typename> friend class table;
table_iterator(group_type* pg,std::size_t n,const table_element_type* p_)
template<
typename Ptr,typename Ptr2,
typename std::enable_if<!std::is_same<Ptr,Ptr2>::value>::type* = nullptr
>
static Ptr to_pointer(Ptr2 p)
{
if(pg)
{
using pointer_traits=boost::pointer_traits<char_pointer>;
pc=pointer_traits::pointer_to(
reinterpret_cast<unsigned char*>(const_cast<group_type*>(pg))[n]);
}
if(p_)
{
using pointer_traits=boost::pointer_traits<table_element_pointer>;
p=pointer_traits::pointer_to(*const_cast<table_element_type*>(p_));
}
if(!p){return nullptr;}
return boost::pointer_traits<Ptr>::pointer_to(*p);
}
template<typename Ptr>
static Ptr to_pointer(Ptr p)
{
return p;
}
table_iterator(group_type* pg,std::size_t n,const table_element_type* p_):
pc{to_pointer<char_pointer>(
reinterpret_cast<unsigned char*>(const_cast<group_type*>(pg))+n)},
p{to_pointer<table_element_pointer>(const_cast<table_element_type*>(p_))}
{}
inline void increment()noexcept
{
BOOST_ASSERT(p!=nullptr);