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ghostwriter/src/MemoryArena.cpp at master · jackcoolpython/ghostwriter · GitHub
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MemoryArena.cpp
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/*
**********************************************************************
*
* Copyright (C) 2020 wereturtle
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
**********************************************************************
*/
#
include
<
QLinkedListIterator
>
#
include
"
MemoryArena.h
"
template
<
class
T
>
MemoryArena<T>::MemoryArena() :
currentChunk
(arena), slotIndex(
0
), chunkSize(
256
)
{
;
}
template
<
class
T
>
MemoryArena<T>::MemoryArena(
const
size_t
chunkSize) :
currentChunk
(arena), slotIndex(
0
), chunkSize(chunkSize)
{
;
}
template
<
class
T
>
MemoryArena<T>::
~MemoryArena
()
{
freeAll
();
}
template
<
class
T
>
T* MemoryArena<T>::allocate()
{
if
(
arena.
isEmpty
() || (slotIndex >= (
int
)chunkSize)
)
{
if
(!currentChunk.
hasNext
())
{
currentChunk.
insert
(
new
Chunk
(chunkSize));
}
else
{
currentChunk.
next
();
}
slotIndex =
0
;
}
else
if
(
0
== slotIndex && currentChunk.
hasNext
())
{
currentChunk.
next
();
}
T* data = currentChunk.
peekPrevious
()->
data
();
if
(
NULL
!= data)
{
int
index = slotIndex;
slotIndex++;
return
&(data[index]);
}
return
NULL
;
}
template
<
class
T
>
void
MemoryArena<T>::freeAll()
{
currentChunk.
toFront
();
while
(currentChunk.
hasNext
())
{
Chunk* chunk = currentChunk.
next
();
if
(
NULL
!= chunk)
{
delete
chunk;
}
currentChunk.
remove
();
}
slotIndex =
0
;
}
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