block-allocator.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2004
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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namespace Gecode { namespace Support {
template<class T, class A, int blocksize = 512>
class BlockAllocator {
private:
A& a;
class Block {
public:
T b[blocksize];
Block* next;
};
Block* b;
T* n;
size_t _size;
void allocate(void);
public:
BlockAllocator(A& a);
~BlockAllocator(void);
A& allocator(void);
T* operator ()(void);
size_t size(void) const;
};
template<class T, class A, int blocksize = 512>
class BlockClient {
public:
static void* operator new(size_t s, BlockAllocator<T,A,blocksize>& ba);
static void operator delete(void*, BlockAllocator<T,A,blocksize>& ba);
static void operator delete(void*);
};
template<class T, class A, int blocksize>
forceinline
BlockAllocator<T,A,blocksize>::BlockAllocator(A& a0) : a(a0) {
b = static_cast<Block*>(a.ralloc(sizeof(Block)));
b->next = NULL;
n = &b->b[blocksize];
_size = sizeof(Block);
}
template<class T, class A, int blocksize>
forceinline
BlockAllocator<T,A,blocksize>::~BlockAllocator(void) {
while (b != NULL) {
Block* f = b; b = b->next;
a.rfree(f,sizeof(Block));
}
}
template<class T, class A, int blocksize>
forceinline A&
BlockAllocator<T,A,blocksize>::allocator(void) {
return a;
}
template<class T, class A, int blocksize>
forceinline T*
BlockAllocator<T,A,blocksize>::operator ()(void) {
T* t = --n;
if (t == &b->b[0])
allocate();
return t;
}
template<class T, class A, int blocksize>
void
BlockAllocator<T,A,blocksize>::allocate(void) {
// Allocate another block
Block* nb = static_cast<Block*>(a.ralloc(sizeof(Block)));
nb->next = b; b = nb;
n = &nb->b[blocksize];
_size += sizeof(Block);
}
template<class T, class A, int blocksize>
forceinline size_t
BlockAllocator<T,A,blocksize>::size(void) const {
return _size;
}
template<class T, class A, int blocksize>
forceinline void
BlockClient<T,A,blocksize>::operator
delete(void*,BlockAllocator<T,A,blocksize>&) {
}
template<class T, class A, int blocksize>
forceinline void
BlockClient<T,A,blocksize>::operator delete(void*) {
}
template<class T, class A, int blocksize>
forceinline void*
BlockClient<T,A,blocksize>::operator new(size_t,
BlockAllocator<T,A,blocksize>& ba) {
return ba();
}
}}
// STATISTICS: support-any
Gecode::Support::BlockAllocator
Manage memory organized into block lists (allocator).
Definition block-allocator.hpp:45
Gecode::Support::BlockAllocator::allocator
A & allocator(void)
Return allocator used.
Definition block-allocator.hpp:116
Gecode::Support::BlockAllocator::~BlockAllocator
~BlockAllocator(void)
Free all allocated blocks.
Definition block-allocator.hpp:107
Gecode::Support::BlockAllocator::size
size_t size(void) const
Return size of memory required by allocator.
Definition block-allocator.hpp:141
Gecode::Support::BlockAllocator::BlockAllocator
BlockAllocator(A &a)
Initialize.
Definition block-allocator.hpp:98
Gecode::Support::BlockAllocator::operator()
T * operator()(void)
Return memory of size required by T.
Definition block-allocator.hpp:122
Gecode::Support::BlockClient
Client for block allocator of type T.
Definition block-allocator.hpp:84
Test::Base::next
Base * next(void) const
Return next test.
Definition test.hpp:58
Gecode::Support
Support algorithms and datastructures
Gecode
Gecode toplevel namespace
Gecode::ba
IntPropLevel ba(IntPropLevel ipl)
Extract basic or advanced from propagation level.
Definition ipl.hpp:43
forceinline
#define forceinline
Definition config.hpp:187