99 lines
4.7 KiB
C++
99 lines
4.7 KiB
C++
/*************************************************************************/
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/* */
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/* Centre for Speech Technology Research */
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/* University of Edinburgh, UK */
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/* Copyright (c) 1995,1996 */
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/* All Rights Reserved. */
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/* */
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/* Permission is hereby granted, free of charge, to use and distribute */
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/* this software and its documentation without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of this work, and to */
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/* permit persons to whom this work is furnished to do so, subject to */
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/* the following conditions: */
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/* 1. The code must retain the above copyright notice, this list of */
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/* conditions and the following disclaimer. */
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/* 2. Any modifications must be clearly marked as such. */
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/* 3. Original authors' names are not deleted. */
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/* 4. The authors' names are not used to endorse or promote products */
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/* derived from this software without specific prior written */
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/* permission. */
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/* */
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/* THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK */
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/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
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/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
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/* SHALL THE UNIVERSITY OF EDINBURGH NOR THE CONTRIBUTORS BE LIABLE */
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/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
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/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
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/* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
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/* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
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/* THIS SOFTWARE. */
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/* */
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/*************************************************************************/
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/* Author : Alan W Black */
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/* Date : May 1996 */
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/*-----------------------------------------------------------------------*/
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/* A class for representing ints floats and strings */
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/* */
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/*=======================================================================*/
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#ifndef __EST_CONTENTS_H__
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#define __EST_CONTENTS_H__
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/** A class for containing some other (arbitrary) class
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Not general enough to call itself a run-time type system
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Is designed to solve the problem of holding user
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specified information.
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Keeps reference count to know when to delete contents
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This is done on two levels EST_Contents and Contents_Data
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*/
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class EST_Content_Data{
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private:
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int refs;
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void *data;
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void (*free_func)(void *data);
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public:
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EST_Content_Data(void *d,void (*f)(void *d)) {free_func=f; data=d; refs=1;}
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~EST_Content_Data() { free_func(data); }
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///
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int unref() { return --refs; }
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///
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int ref() { return ++refs; }
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///
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int the_refs() { return refs; }
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void *contents() { return data; }
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EST_Content_Data &operator=(const EST_Content_Data &c)
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{refs = c.refs; data = c.data; free_func = free_func; return *this;}
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};
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/** More contents */
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class EST_Contents{
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private:
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EST_Content_Data *content_data;
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void unref_contents(void)
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{ if ((content_data != 0) &&
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(content_data->unref() == 0))
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delete content_data;}
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public:
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EST_Contents() { content_data = 0; }
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EST_Contents(void *p,void (*free_func)(void *p))
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{ content_data = new EST_Content_Data(p,free_func); }
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~EST_Contents() { unref_contents(); }
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void set_contents(void *p,void (*free_func)(void *p))
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{ unref_contents(); content_data = new EST_Content_Data(p,free_func);}
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void *get_contents() const
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{return (content_data ? content_data->contents() : 0);}
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///
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int refs() const { return ((content_data == 0) ? 0 :
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content_data->the_refs());}
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EST_Contents &operator=(const EST_Contents &c)
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{ unref_contents();
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content_data = c.content_data;
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if (content_data != 0) content_data->ref();
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return *this; }
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};
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#endif
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