120 lines
4 KiB
C++
120 lines
4 KiB
C++
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/*
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TYPED-COUNTER.hpp - maintain a set of type based contexts
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Copyright (C) Lumiera.org
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2009, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file typed-allocation-manager.hpp
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** Abstract foundation for building custom allocation managers.
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** Currently (as of 8/09) this is a draft, factored out of the command-registry.
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** The expectation is that we'll face several similar situations, and thus it
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** would be good to build up a common set of operations and behaviour.
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** @todo WIP WIP.
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**
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** \par Concept Summary
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** The idea is rather to tie the memory manager to a very specific usage situation,
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** then to provide a general-purpose allocator to be used by any instance of a given
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** type. Typically, the goal is to handle memory management for an index or registry,
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** holding implementation objects to be shielded from the client code. Moreover, we'll
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** have to deal with families of types rather then with individual types; usually
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** there will be some common or combined handling for all family members.
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**
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** The intention is for this TypedAllocationManager template to be used both as a base
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** class providing the implementation skeleton for the actual custom allocation manager,
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** and as an abstract interface, which can be forwarded to the \em implementation classes
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** in case there is some cooperation required to get the allocation done (for example,
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** there might be some type erasure involved, leaving the (otherwise opaque) implementation
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** class as the only entity with a limited knowledge about the actual memory layout, and
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** thus the only way of creating a clone properly would be to forward down into this
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** implementation class).
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**
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** Thus, TypedAllocationManager provides the classical operations of an allocator
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** - allocate
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** - construct
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** - deallocate
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** But each of these operations is to be invoked in a \em typed context. Besides,
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** there is a facility allowing to create ref-counting handles and smart-pointers,
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** which are internally tied to this memory manager through a deleter function.
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**
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** @todo using a quick-n-dirty heap allocation implementation for now (8/09),
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** but should write a custom allocator based on cehteh's mpool!
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**
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** @see CommandRegistry
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** @see AllocationCluster (another custom allocation scheme, which could be united)
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**
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*/
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#ifndef LIB_TYPED_COUNTER_H
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#define LIB_TYPED_COUNTER_H
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//#include "pre.hpp"
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#include "lib/error.hpp"
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#include "lib/format.hpp"
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#include "include/logging.h"
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#include <tr1/memory>
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namespace lib {
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using std::tr1::shared_ptr;
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/**
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* temporary helper to count the number of allocations
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* for diagnostic purpose. When actually implementing a
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* custom allocation, this information should be available
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* from the allocator.
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*/
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class TypedCounter
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{
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public:
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template<class X>
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size_t
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get() const
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{
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UNIMPLEMENTED ("get typed count");
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}
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template<class X>
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void
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inc()
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{
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UNIMPLEMENTED ("increment typed count");
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}
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template<class X>
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void
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dec()
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{
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UNIMPLEMENTED ("decrement typed count");
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}
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};
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} // namespace lib
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#endif
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