coder_factory.h

A Library of Efficient Data Types and Algorithms,封装了常用的ADT及其相关算法的软件包

/*******************************************************************************
+
+  LEDA 4.5  
+
+
+  coder_factory.h
+
+
+  Copyright (c) 1995-2004
+  by Algorithmic Solutions Software GmbH
+  All rights reserved.
+ 
*******************************************************************************/

// $Revision: 1.10 $  $Date: 2004/02/19 11:41:35 $

#ifndef _LEDA_CODER_FACTORY_H
#define _LEDA_CODER_FACTORY_H

#if !defined(LEDA_ROOT_INCL_ID)
#define LEDA_ROOT_INCL_ID 450353
#include <LEDA/PREAMBLE.h>
#endif

#include <LEDA/impl/coder_base.h>
#include <LEDA/list.h>
#include <LEDA/h_array.h>
#include <LEDA/list.h>

#if (defined(_MSC_VER) && _MSC_VER < 1300) || defined(__DECCXX)
// work-around for MSVC 6.0 and CXX 5.1 (alpha)
#define LEDA_COMPRESSION_WA3
#endif

LEDA_BEGIN_NAMESPACE

/// coder_factory ///////////////////////////////////////////////////////////////////////////

class __exportC coder_factory {
public:
	typedef coder_base::id_type id_type;
	typedef coder_base* (*coder_construction_func)();

public:
	coder_factory();

	coder_base* construct_coder_by_id(id_type id);

	void register_id(id_type id, coder_construction_func ctor);

	list<coder_base*> get_all_coders();
	list<coder_base*> get_standalone_coders();

	void print_registered_coders(ostream& out = cout); // for debugging

private:
	void init();
	void destroy();

private:
	h_array<id_type, coder_construction_func>* pCoderConstructorMap;

private:
#if defined(LEDA_MULTI_THREAD)
	leda_mutex mutex_count;
	void lock()   { mutex_count.lock(); }
	void unlock() { mutex_count.unlock(); }
#else
	void lock()   {}
	void unlock() {}
#endif

	friend class coder_factory_init;
};

extern __exportD coder_factory CoderFactory;

#ifndef LEDA_COMPRESSION_WA3
template <class Coder>
coder_base* coder_constructor() { return new Coder; }

template <class Coder>
class register_coder {
public:
	register_coder() { CoderFactory.register_id(Coder::ID, &coder_constructor<Coder>); }
};
#endif

class __exportC coder_factory_init {
	static unsigned Count;
public:
	coder_factory_init();
	~coder_factory_init();
};

static coder_factory_init _init_coder_factory_;

#if LEDA_ROOT_INCL_ID == 450353
#undef LEDA_ROOT_INCL_ID
#include <LEDA/POSTAMBLE.h>
#endif

LEDA_END_NAMESPACE

#endif