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-'\" t
-.TH QGuardedPtr 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
-.\" Copyright 1992-2007 Trolltech ASA.  All rights reserved.  See the
-.\" license file included in the distribution for a complete license
-.\" statement.
-.\"
-.ad l
-.nh
-.SH NAME
-QGuardedPtr \- Template class that provides guarded pointers to QObjects
-.SH SYNOPSIS
-\fC#include <ntqguardedptr.h>\fR
-.PP
-.SS "Public Members"
-.in +1c
-.ti -1c
-.BI "\fBQGuardedPtr\fR ()"
-.br
-.ti -1c
-.BI "\fBQGuardedPtr\fR ( T * p )"
-.br
-.ti -1c
-.BI "\fBQGuardedPtr\fR ( const QGuardedPtr<T> & p )"
-.br
-.ti -1c
-.BI "\fB~QGuardedPtr\fR ()"
-.br
-.ti -1c
-.BI "QGuardedPtr<T> & \fBoperator=\fR ( const QGuardedPtr<T> & p )"
-.br
-.ti -1c
-.BI "QGuardedPtr<T> & \fBoperator=\fR ( T * p )"
-.br
-.ti -1c
-.BI "bool \fBoperator==\fR ( const QGuardedPtr<T> & p ) const"
-.br
-.ti -1c
-.BI "bool \fBoperator!=\fR ( const QGuardedPtr<T> & p ) const"
-.br
-.ti -1c
-.BI "bool \fBisNull\fR () const"
-.br
-.ti -1c
-.BI "T * \fBoperator->\fR () const"
-.br
-.ti -1c
-.BI "T & \fBoperator*\fR () const"
-.br
-.ti -1c
-.BI "\fBoperator T *\fR () const"
-.br
-.in -1c
-.SH DESCRIPTION
-The QGuardedPtr class is a template class that provides guarded pointers to QObjects.
-.PP
-A guarded pointer, \fCQGuardedPtr<X>\fR, behaves like a normal C++ pointer \fCX*\fR, except that it is automatically set to 0 when the referenced object is destroyed (unlike normal C++ pointers, which become "dangling pointers" in such cases). \fCX\fR must be a subclass of QObject.
-.PP
-Guarded pointers are useful whenever you need to store a pointer to a QObject that is owned by someone else and therefore might be destroyed while you still hold a reference to it. You can safely test the pointer for validity.
-.PP
-Example:
-.PP
-.nf
-.br
-        QGuardedPtr<QLabel> label = new QLabel( 0, "label" );
-.br
-        label->setText( "I like guarded pointers" );
-.br
-.br
-        delete (QLabel*) label; // simulate somebody destroying the label
-.br
-.br
-        if ( label)
-.br
-            label->show();
-.br
-        else
-.br
-            tqDebug("The label has been destroyed");
-.br
-.fi
-.PP
-The program will output \fCThe label has been destroyed\fR rather than dereferencing an invalid address in \fClabel->show()\fR.
-.PP
-The functions and operators available with a QGuardedPtr are the same as those available with a normal unguarded pointer, except the pointer arithmetic operators (++, --, -, and +), which are normally used only with arrays of objects. Use them like normal pointers and you will not need to read this class documentation.
-.PP
-For creating guarded pointers, you can construct or assign to them from an X* or from another guarded pointer of the same type. You can compare them with each other using operator==() and operator!=(), or test for 0 with isNull(). And you can dereference them using either the \fC*x\fR or the \fCx->member\fR notation.
-.PP
-A guarded pointer will automatically cast to an X*, so you can freely mix guarded and unguarded pointers. This means that if you have a QGuardedPtr<QWidget>, you can pass it to a function that requires a QWidget*. For this reason, it is of little value to declare functions to take a QGuardedPtr as a parameter; just use normal pointers. Use a QGuardedPtr when you are storing a pointer over time.
-.PP
-Note again that class \fIX\fR must inherit QObject, or a compilation or link error will result.
-.PP
-See also Object Model.
-.SH MEMBER FUNCTION DOCUMENTATION
-.SH "QGuardedPtr::QGuardedPtr ()"
-Constructs a 0 guarded pointer.
-.PP
-See also isNull().
-.SH "QGuardedPtr::QGuardedPtr ( T * p )"
-Constructs a guarded pointer that points to same object as \fIp\fR points to.
-.SH "QGuardedPtr::QGuardedPtr ( const QGuardedPtr<T> & p )"
-Copy one guarded pointer from another. The constructed guarded pointer points to the same object that \fIp\fR points to (which may be 0).
-.SH "QGuardedPtr::~QGuardedPtr ()"
-Destroys the guarded pointer. Just like a normal pointer, destroying a guarded pointer does \fInot\fR destroy the object being pointed to.
-.SH "bool QGuardedPtr::isNull () const"
-Returns \fCTRUE\fR if the referenced object has been destroyed or if there is no referenced object; otherwise returns FALSE.
-.SH "QGuardedPtr::operator T * () const"
-Cast operator; implements pointer semantics. Because of this function you can pass a QGuardedPtr<X> to a function where an X* is required.
-.SH "bool QGuardedPtr::operator!= ( const QGuardedPtr<T> & p ) const"
-Inequality operator; implements pointer semantics, the negation of operator==(). Returns TRUE if \fIp\fR and this guarded pointer are not pointing to the same object; otherwise returns FALSE.
-.SH "T & QGuardedPtr::operator* () const"
-Dereference operator; implements pointer semantics. Just use this operator as you would with a normal C++ pointer.
-.SH "T * QGuardedPtr::operator-> () const"
-Overloaded arrow operator; implements pointer semantics. Just use this operator as you would with a normal C++ pointer.
-.SH "QGuardedPtr<T> & QGuardedPtr::operator= ( const QGuardedPtr<T> & p )"
-Assignment operator. This guarded pointer then points to the same object as \fIp\fR points to.
-.SH "QGuardedPtr<T> & QGuardedPtr::operator= ( T * p )"
-This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
-.PP
-Assignment operator. This guarded pointer then points to the same object as \fIp\fR points to.
-.SH "bool QGuardedPtr::operator== ( const QGuardedPtr<T> & p ) const"
-Equality operator; implements traditional pointer semantics. Returns TRUE if both \fIp\fR and this guarded pointer are 0, or if both \fIp\fR and this pointer point to the same object; otherwise returns FALSE.
-.PP
-See also operator!=().
-
-.SH "SEE ALSO"
-.BR http://doc.trolltech.com/ntqguardedptr.html
-.BR http://www.trolltech.com/faq/tech.html
-.SH COPYRIGHT
-Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
-license file included in the distribution for a complete license
-statement.
-.SH AUTHOR
-Generated automatically from the source code.
-.SH BUGS
-If you find a bug in Qt, please report it as described in
-.BR http://doc.trolltech.com/bughowto.html .
-Good bug reports help us to help you. Thank you.
-.P
-The definitive Qt documentation is provided in HTML format; it is
-located at $QTDIR/doc/html and can be read using Qt Assistant or with
-a web browser. This man page is provided as a convenience for those
-users who prefer man pages, although this format is not officially
-supported by Trolltech. 
-.P
-If you find errors in this manual page, please report them to
-.BR qt-bugs@trolltech.com .
-Please include the name of the manual page (qguardedptr.3qt) and the Qt
-version (3.3.8).