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replaced homegrown ebo_base with boost::empty_value

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joaquintides
2022-10-03 19:36:53 +02:00
parent 2ae70cd05c
commit 357eed44a1
1 changed files with 21 additions and 42 deletions
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63
include/boost/unordered/detail/foa.hpp
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@ -14,11 +14,11 @@
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/core/bit.hpp>
#include <boost/core/empty_value.hpp>
#include <boost/core/no_exceptions_support.hpp>
#include <boost/core/pointer_traits.hpp>
#include <boost/cstdint.hpp>
#include <boost/predef.h>
#include <boost/type_traits/is_final.hpp>
#include <boost/type_traits/is_nothrow_swappable.hpp>
#include <climits>
#include <cmath>
@ -824,29 +824,6 @@ using table_arrays=typename std::conditional<
aligned_table_arrays<Value,Group,SizePolicy>,
subaligned_table_arrays<Value,Group,SizePolicy>>::type;
template<std::size_t I,typename T,typename=void>
struct ebo_base
{
T& get(){return x;}
const T& get()const{return x;}
T x;
};
template<std::size_t I,typename T>
struct ebo_base<
I,T,
typename std::enable_if<
std::is_class<T>::value&&!boost::is_final<T>::value>::type
>:T
{
template<typename Arg>
ebo_base(Arg&& x):T{std::forward<Arg>(x)}{}
T& get(){return *this;}
const T& get()const{return *this;}
};
#if defined(BOOST_GCC)
/* GCC's -Wshadow triggers at scenarios like this:
*
@ -862,7 +839,7 @@ struct ebo_base<
*
* This makes shadowing warnings unavoidable in general when a class template
* derives from user-provided classes, as is the case with table and
* ebo_base's below.
* empty_value's below.
*/
#pragma GCC diagnostic push
@ -876,11 +853,11 @@ class
__declspec(empty_bases) /* activate EBO with multiple inheritance */
#endif
table:ebo_base<0,Hash>,ebo_base<1,Pred>,ebo_base<2,Allocator>
table:empty_value<Hash,0>,empty_value<Pred,1>,empty_value<Allocator,1>
{
using hash_base=ebo_base<0,Hash>;
using pred_base=ebo_base<1,Pred>;
using allocator_base=ebo_base<2,Allocator>;
using hash_base=empty_value<Hash,0>;
using pred_base=empty_value<Pred,1>;
using allocator_base=empty_value<Allocator,1>;
using type_policy=TypePolicy;
using group_type=group15;
static constexpr auto N=group_type::N;
@ -915,8 +892,9 @@ public:
table(
std::size_t n=0,const Hash& h_=Hash(),const Pred& pred_=Pred(),
const Allocator& al_=Allocator()):
hash_base{h_},pred_base{pred_},allocator_base{al_},
size_{0},arrays{new_arrays(n)},ml{max_load()}
hash_base{empty_init,h_},pred_base{empty_init,pred_},
allocator_base{empty_init,al_},size_{0},arrays{new_arrays(n)},
ml{max_load()}
{}
table(const table& x):
@ -928,8 +906,10 @@ public:
std::is_nothrow_move_constructible<Pred>::value&&
std::is_nothrow_move_constructible<Allocator>::value):
// TODO verify if we should copy or move copy hash, pred and al
hash_base{std::move(x.h())},pred_base{std::move(x.pred())},
allocator_base{std::move(x.al())},size_{x.size_},arrays{x.arrays},ml{x.ml}
hash_base{empty_init,std::move(x.h())},
pred_base{empty_init,std::move(x.pred())},
allocator_base{empty_init,std::move(x.al())},
size_{x.size_},arrays{x.arrays},ml{x.ml}
{
x.size_=0;
x.arrays=x.new_arrays(0);
@ -937,7 +917,8 @@ public:
}
table(const table& x,const Allocator& al_):
hash_base{x.h()},pred_base{x.pred()},allocator_base{al_},size_{0},
hash_base{empty_init,x.h()},pred_base{empty_init,x.pred()},
allocator_base{empty_init,al_},size_{0},
arrays{
new_arrays(std::size_t(std::ceil(static_cast<float>(x.size())/mlf)))},
ml{max_load()}
@ -1210,14 +1191,12 @@ public:
private:
using arrays_type=table_arrays<value_type,group_type,size_policy>;
Hash& h(){return static_cast<hash_base*>(this)->get();}
const Hash& h()const{return static_cast<const hash_base*>(this)->get();}
Pred& pred(){return static_cast<pred_base*>(this)->get();}
const Pred& pred()const
{return static_cast<const pred_base*>(this)->get();}
Allocator& al(){return static_cast<allocator_base*>(this)->get();}
const Allocator& al()const
{return static_cast<const allocator_base*>(this)->get();}
Hash& h(){return hash_base::get();}
const Hash& h()const{return hash_base::get();}
Pred& pred(){return pred_base::get();}
const Pred& pred()const{return pred_base::get();}
Allocator& al(){return allocator_base::get();}
const Allocator& al()const{return allocator_base::get();}
arrays_type new_arrays(std::size_t n)
{