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Make hasallocator take advantage of empty base optimization for simpler code

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rexy712 2022-07-19 16:43:19 -07:00
parent 43dc4b6654
commit 858f7533e6
1 changed files with 5 additions and 35 deletions
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40
include/rexy/detail/hasallocator.hpp
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@ -26,47 +26,17 @@
namespace rexy::detail{ namespace rexy::detail{
template<REXY_ALLOCATOR_CONCEPT Alloc, bool EmptyAlloc = std::is_empty_v<Alloc>>
struct hasallocator
{
Alloc m_alloc;
REXY_CPP20_CONSTEXPR auto allocate(typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
return m_alloc.allocate(bytes);
}
REXY_CPP20_CONSTEXPR void deallocate(typename Alloc::pointer p, typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
m_alloc.deallocate(p, bytes);
}
constexpr Alloc& allocator(void){
return m_alloc;
}
constexpr const Alloc& allocator(void)const{
return m_alloc;
}
};
#if __has_cpp_attribute(no_unique_address)
template<REXY_ALLOCATOR_CONCEPT Alloc> template<REXY_ALLOCATOR_CONCEPT Alloc>
struct hasallocator<Alloc,true> struct hasallocator : public Alloc{
{ using Alloc::Alloc;
[[no_unique_address]] using Alloc::operator=;
Alloc m_alloc;
REXY_CPP20_CONSTEXPR auto allocate(typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
return m_alloc.allocate(bytes);
}
REXY_CPP20_CONSTEXPR void deallocate(typename Alloc::pointer p, typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
m_alloc.deallocate(p, bytes);
}
constexpr Alloc& allocator(void){ constexpr Alloc& allocator(void){
return m_alloc; return *this;
} }
constexpr const Alloc& allocator(void)const{ constexpr const Alloc& allocator(void)const{
return m_alloc; return *this;
} }
}; };
#endif //no_unique_address
} }
#endif #endif