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Library: consider to align this with the »Factory« concept

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even while at first sight only a ''deleter instance'' is required,
it seems prudent to rearrange the code in accordance to the prospective
Allocator / Object Factory concept, and rather try to incorporate
the specifics of the memory layout into this generic view, thereby
abstracting the actual allocator away.

This can be achieved by using a standard-allocator for `std::byte`
as the base allocator and treat each individual element allocator
as a specialised cross-allocator (assuming that this cross adaptation
is actually trivial in almost all cases)
This commit is contained in:
Fischlurch 2024-06-06 21:13:50 +02:00
parent bf74ba6292
commit 0e2ca6ee1c
2 changed files with 31 additions and 13 deletions
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32
src/lib/several-builder.hpp
View file

@ -73,36 +73,44 @@ namespace lib {
template<class I, class E>
struct DeleterTrampoline
template<class I, template<typename> class ALO>
struct ElementFactory
: private ALO<std::byte>
{
using Allo = std::allocator<E>;
using Allo = ALO<std::byte>;
using AlloT = std::allocator_traits<Allo>;
Allo& baseAllocator() { return *this; }
template<typename X>
static auto
auto
adaptAllocator()
{
using XAllo = typename AlloT::template rebind_alloc<X>;
if constexpr (std::is_constructible_v<XAllo, Allo>)
return XAllo{Allo()};
return XAllo{baseAllocator()};
else
return XAllo{};
}
static void
ElementFactory (Allo allo = Allo{})
: Allo{std::move (allo)}
{ }
template<class E>
void
destroy (ArrayBucket<I>* bucket, size_t size)
{
Allo allo{};
REQUIRE (bucket);
using ElmAlloT = typename AlloT::template rebind_traits<E>;
auto elmAllo = adaptAllocator<E>();
for (size_t i=0; i<size; ++i)
AlloT::destroy (allo, & bucket->subscript(i));
ElmAlloT::destroy (elmAllo, & bucket->subscript(i));
size_t storageBytes = sizeof(ArrayBucket<I>) - sizeof(ArrayBucket<I>::storage)
+ size * sizeof(E);
+ size * bucket->spread;
using BAlloT = typename AlloT::template rebind_traits<std::byte>;
auto bAllo = adaptAllocator<std::byte>();
BAlloT::deallocate (bAllo, bucket, storageBytes);
AlloT::deallocate (baseAllocator(), bucket, storageBytes);
};
};

12
wiki/thinkPad.ichthyo.mm
View file

@ -81975,6 +81975,11 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
<icon BUILTIN="idea"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717710799094" ID="ID_310099304" MODIFIED="1717710881440" TEXT="ObjectFactory">
<linktarget COLOR="#867587" DESTINATION="ID_310099304" ENDARROW="Default" ENDINCLINATION="-927;146;" ID="Arrow_ID_1881268863" SOURCE="ID_342640598" STARTARROW="None" STARTINCLINATION="-107;-6;"/>
<icon BUILTIN="flag-yellow"/>
<node CREATED="1717710834678" ID="ID_16117383" MODIFIED="1717710852024" TEXT="eine Variation der generischen StdFactory"/>
</node>
</node>
</node>
</node>
@ -82231,7 +82236,7 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
<node CREATED="1717632444817" ID="ID_362040312" MODIFIED="1717632448869" TEXT="Speicher freigeben"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717632477490" ID="ID_83921320" MODIFIED="1717632530750" TEXT="beide Aufgaben m&#xfc;ssen in das Trampolin">
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717632477490" ID="ID_83921320" MODIFIED="1717710899555" TEXT="beide Aufgaben m&#xfc;ssen in das Trampolin">
<icon BUILTIN="flag-yellow"/>
<node CREATED="1717632816553" ID="ID_719956571" MODIFIED="1717632856947" TEXT="geht leider nicht anders...">
<richcontent TYPE="NOTE"><html>
@ -82251,6 +82256,11 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717710755310" ID="ID_342640598" MODIFIED="1717710895137" TEXT="sinnvollerweise mit einer Allocator-Factory hinterlegen">
<arrowlink COLOR="#867587" DESTINATION="ID_310099304" ENDARROW="Default" ENDINCLINATION="-927;146;" ID="Arrow_ID_1881268863" STARTARROW="None" STARTINCLINATION="-107;-6;"/>
<icon BUILTIN="flag-yellow"/>
<node CREATED="1717710901355" ID="ID_718524980" MODIFIED="1717710916991" TEXT="das Meiste ist n&#xe4;mlich generische boilerplate"/>
</node>
</node>
<node CREATED="1717543083078" ID="ID_530261806" MODIFIED="1717543114805" TEXT="getMover()"/>
</node>