http://mit.spbau.ru/sewiki/index.php?action=history&feed=atom&title=%22shared_ptr%22 2026-05-01T18:12:39Z История изменений этой страницы в вики MediaWiki 1.26.2 http://mit.spbau.ru/sewiki/index.php?title=%22shared_ptr%22&diff=9925&oldid=prev 2016-12-27T10:00:17Z

<p>Новая страница: «&lt;pre&gt; #ifndef _SHAREDPTR_H_ #define _SHAREDPTR_H_ #include &quot;GaussNumber.h&quot; #define NULL 0 class Storage { private: GaussNumber *p_obj; int count; public: S…»</p> <p><b>Новая страница</b></p><div>&lt;pre&gt;<br /> #ifndef _SHAREDPTR_H_<br /> #define _SHAREDPTR_H_<br /> <br /> #include &quot;GaussNumber.h&quot;<br /> #define NULL 0<br /> <br /> class Storage {<br /> <br /> private:<br /> GaussNumber *p_obj;<br /> int count;<br /> <br /> public:<br /> Storage(GaussNumber *p_obj);<br /> ~Storage();<br /> void increaseCount();<br /> void decreaseCount();<br /> GaussNumber *ptr() const;<br /> bool isNull() const;<br /> <br /> };<br /> <br /> <br /> class shared_ptr {<br /> <br /> private:<br /> Storage *storage;<br /> <br /> public:<br /> shared_ptr();<br /> shared_ptr(GaussNumber *p_obj);<br /> shared_ptr(const shared_ptr &amp;sptr);<br /> ~shared_ptr();<br /> const shared_ptr &amp;operator=(const shared_ptr &amp;sptr);<br /> GaussNumber &amp;operator*() const;<br /> GaussNumber *operator-&gt;() const;<br /> GaussNumber *ptr() const;<br /> bool isNull() const;<br /> <br /> };<br /> <br /> #endif<br /> #include &quot;shared_ptr.h&quot;<br /> <br /> // Storage class definitions<br /> <br /> Storage::Storage(GaussNumber *p_obj) {<br /> this-&gt;p_obj = p_obj;<br /> count = 1;<br /> }<br /> <br /> Storage::~Storage() {<br /> if (p_obj != NULL)<br /> delete p_obj;<br /> }<br /> <br /> void Storage::increaseCount() {<br /> count++;<br /> }<br /> <br /> void Storage::decreaseCount() {<br /> count--;<br /> <br /> if (count == 0)<br /> delete this;<br /> }<br /> <br /> GaussNumber *Storage::ptr() const {<br /> return p_obj;<br /> }<br /> <br /> bool Storage::isNull() const {<br /> if (p_obj == NULL)<br /> return true;<br /> else<br /> return false;<br /> }<br /> <br /> // shared_ptr class definitions<br /> <br /> shared_ptr::shared_ptr() {<br /> storage = new Storage(NULL);<br /> }<br /> <br /> shared_ptr::shared_ptr(GaussNumber *p_obj) {<br /> storage = new Storage(p_obj);<br /> }<br /> <br /> shared_ptr::shared_ptr(const shared_ptr &amp;sptr) {<br /> storage = sptr.storage;<br /> storage-&gt;increaseCount();<br /> }<br /> <br /> shared_ptr::~shared_ptr() {<br /> storage-&gt;decreaseCount();<br /> }<br /> <br /> const shared_ptr &amp;shared_ptr::operator=(const shared_ptr &amp;sptr) {<br /> sptr.storage-&gt;increaseCount();<br /> storage-&gt;decreaseCount();<br /> <br /> storage = sptr.storage;<br /> return *this;<br /> }<br /> <br /> GaussNumber &amp;shared_ptr::operator*() const {<br /> return *storage-&gt;ptr();<br /> }<br /> <br /> GaussNumber *shared_ptr::operator-&gt;() const {<br /> return storage-&gt;ptr();<br /> }<br /> <br /> GaussNumber *shared_ptr::ptr() const {<br /> return storage-&gt;ptr();<br /> }<br /> <br /> bool shared_ptr::isNull() const {<br /> return storage-&gt;isNull();<br /> }<br /> &lt;/pre&gt;</div>

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