Correct wxObjectDataPtr<> assignment from *T to not increase the ref count

[wxWidgets.git] / docs / latex / wx / app.tex

diff --git a/docs/latex/wx/app.tex b/docs/latex/wx/app.tex
index 3606ab231be539cabf6a8433e84895fb612e18c9..adefdadd83d865eb066364b4572ae4f9a711c34c 100644 (file)
--- a/docs/latex/wx/app.tex
+++ b/docs/latex/wx/app.tex
@@ -26,6 +26,10 @@ a reference to your application object) to be visible to other files.
 
 <wx/app.h>
 
 
 <wx/app.h>
 

+\wxheading{Library}
+
+\helpref{wxBase}{librarieslist}
+

 \wxheading{See also}
 
 \helpref{wxApp overview}{wxappoverview}
 \wxheading{See also}
 
 \helpref{wxApp overview}{wxappoverview}


@@ -33,16 +37,16 @@ a reference to your application object) to be visible to other files.
 \latexignore{\rtfignore{\wxheading{Members}}}
 
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
 

-\membersection{wxApp::wxApp}
+\membersection{wxApp::wxApp}\label{wxappctor}

 
 

-\func{void}{wxApp}{\void}
+\func{}{wxApp}{\void}

 
 Constructor. Called implicitly with a definition of a wxApp object.
 
 
 
 Constructor. Called implicitly with a definition of a wxApp object.
 
 

-\membersection{wxApp::\destruct{wxApp}}
+\membersection{wxApp::\destruct{wxApp}}\label{wxappdtor}

 
 

-\func{void}{\destruct{wxApp}}{\void}
+\func{virtual}{\destruct{wxApp}}{\void}

 
 Destructor. Will be called implicitly on program exit if the wxApp
 object is created on the stack.
 
 Destructor. Will be called implicitly on program exit if the wxApp
 object is created on the stack.


@@ -57,10 +61,16 @@ Number of command line arguments (after environment-specific processing).
 
 \membersection{wxApp::argv}\label{wxappargv}
 
 
 \membersection{wxApp::argv}\label{wxappargv}
 

-\member{char **}{argv}
+\member{wxChar **}{argv}

 
 Command line arguments (after environment-specific processing).
 
 Command line arguments (after environment-specific processing).

+Under Windows and Linux/Unix, you should parse the command line
+arguments and check for files to be opened when starting your
+application. Under OS X, you need to override \helpref{MacOpenFile}{wxappmacopenfile}
+since command line arguments are used differently there.

 
 

+You may use the \helpref{wxCmdLineParser}{wxcmdlineparser} to
+parse command line arguments.

 
 \membersection{wxApp::CreateLogTarget}\label{wxappcreatelogtarget}
 
 
 \membersection{wxApp::CreateLogTarget}\label{wxappcreatelogtarget}
 


@@ -74,6 +84,18 @@ implementation returns a new wxLogGui class.
 \helpref{wxLog}{wxlog}
 
 
 \helpref{wxLog}{wxlog}
 
 

+\membersection{wxApp::CreateTraits}\label{wxappcreatetraits}
+
+\func{virtual wxAppTraits *}{CreateTraits}{\void}
+
+Creates the \helpref{wxAppTraits}{wxapptraits} object when \helpref{GetTraits}{wxappgettraits}
+needs it for the first time.
+
+\wxheading{See also}
+
+\helpref{wxAppTraits}{wxapptraits}
+
+

 \membersection{wxApp::Dispatch}\label{wxappdispatch}
 
 \func{virtual void}{Dispatch}{\void}
 \membersection{wxApp::Dispatch}\label{wxappdispatch}
 
 \func{virtual void}{Dispatch}{\void}


@@ -92,6 +114,15 @@ This can be used for programming event loops, e.g.
 \helpref{wxApp::Pending}{wxapppending}
 
 
 \helpref{wxApp::Pending}{wxapppending}
 
 

+\membersection{wxApp::ExitMainLoop}\label{wxappexitmainloop}
+
+\func{virtual void}{ExitMainLoop}{\void}
+
+Call this to explicitly exit the main message (event) loop.
+You should normally exit the main loop (and the application) by deleting
+the top window.
+
+

 \membersection{wxApp::FilterEvent}\label{wxappfilterevent}
 
 \func{int}{FilterEvent}{\param{wxEvent\& }{event}}
 \membersection{wxApp::FilterEvent}\label{wxappfilterevent}
 
 \func{int}{FilterEvent}{\param{wxEvent\& }{event}}


@@ -104,13 +135,19 @@ had been already processed (for the former return value) or that it is not
 going to be processed at all (for the latter one).
 
 
 going to be processed at all (for the latter one).
 
 

-\membersection{wxApp::ExitMainLoop}\label{wxappexitmainloop}
+\membersection{wxApp::GetAppDisplayName}\label{wxappgetappdisplayname}

 
 

-\func{virtual void}{ExitMainLoop}{\void}
+\constfunc{wxString}{GetAppDisplayName}{\void}

 
 

-Call this to explicitly exit the main message (event) loop.
-You should normally exit the main loop (and the application) by deleting
-the top window.
+Returns the user-readable application name. The difference between this string
+and the one returned by \helpref{GetAppName}{wxappgetappname} is that this one
+is meant to be shown to the user and so should be used for the window titles,
+page headers and so on while the other one should be only used internally, e.g.
+for the file names or configuration file keys.
+
+By default, returns the same string as \helpref{GetAppName}{wxappgetappname}.
+
+\newsince{2.9.0}

 
 
 \membersection{wxApp::GetAppName}\label{wxappgetappname}
 
 
 \membersection{wxApp::GetAppName}\label{wxappgetappname}


@@ -124,16 +161,9 @@ Returns the application name.
 wxWidgets sets this to a reasonable default before
 calling \helpref{wxApp::OnInit}{wxapponinit}, but the application can reset it at will.
 
 wxWidgets sets this to a reasonable default before
 calling \helpref{wxApp::OnInit}{wxapponinit}, but the application can reset it at will.
 

-
-\membersection{wxApp::GetAuto3D}\label{wxappgetauto3d}
-
-\constfunc{bool}{GetAuto3D}{\void}
-
-Returns true if 3D control mode is on, false otherwise.
-

 \wxheading{See also}
 
 \wxheading{See also}
 

-\helpref{wxApp::SetAuto3D}{wxappsetauto3d}
+\helpref{GetAppDisplayName}{wxappgetappdisplayname}

 
 
 \membersection{wxApp::GetClassName}\label{wxappgetclassname}
 
 
 \membersection{wxApp::GetClassName}\label{wxappgetclassname}


@@ -161,6 +191,18 @@ otherwise.
 \helpref{wxApp shutdown overview}{wxappshutdownoverview}
 
 
 \helpref{wxApp shutdown overview}{wxappshutdownoverview}
 
 

+\membersection{wxApp::GetInstance}\label{wxappgetinstance}
+
+\func{static wxAppConsole *}{GetInstance}{\void}
+
+Returns the one and only global application object.
+Usually \texttt{wxTheApp} is usead instead.
+
+\wxheading{See also}
+
+\helpref{wxApp::SetInstance}{wxappsetinstance}
+
+

 \membersection{wxApp::GetTopWindow}\label{wxappgettopwindow}
 
 \constfunc{virtual wxWindow *}{GetTopWindow}{\void}
 \membersection{wxApp::GetTopWindow}\label{wxappgettopwindow}
 
 \constfunc{virtual wxWindow *}{GetTopWindow}{\void}


@@ -177,6 +219,17 @@ function will find the first top-level window (frame or dialog) and return that.
 \helpref{SetTopWindow}{wxappsettopwindow}
 
 
 \helpref{SetTopWindow}{wxappsettopwindow}
 
 

+
+\membersection{wxApp::GetTraits}\label{wxappgettraits}
+
+\func{wxAppTraits *}{GetTraits}{\void}
+
+Returns a pointer to the \helpref{wxAppTraits}{wxapptraits} object for the application.
+If you want to customize the \helpref{wxAppTraits}{wxapptraits} object, you must override the
+\helpref{CreateTraits}{wxappcreatetraits} function.
+
+
+

 \membersection{wxApp::GetUseBestVisual}\label{wxappgetusebestvisual}
 
 \constfunc{bool}{GetUseBestVisual}{\void}
 \membersection{wxApp::GetUseBestVisual}\label{wxappgetusebestvisual}
 
 \constfunc{bool}{GetUseBestVisual}{\void}


@@ -189,6 +242,21 @@ different visuals, false otherwise.
 \helpref{SetUseBestVisual}{wxappsetusebestvisual}
 
 
 \helpref{SetUseBestVisual}{wxappsetusebestvisual}
 
 

+\membersection{wxApp::GetVendorDisplayName}\label{wxappgetvendordisplayname}
+
+\constfunc{wxString}{GetVendorDisplayName}{\void}
+
+Returns the user-readable vendor name. The difference between this string
+and the one returned by \helpref{GetVendorName}{wxappgetvendorname} is that this one
+is meant to be shown to the user and so should be used for the window titles,
+page headers and so on while the other one should be only used internally, e.g.
+for the file names or configuration file keys.
+
+By default, returns the same string as \helpref{GetVendorName}{wxappgetvendorname}.
+
+\newsince{2.9.0}
+
+

 \membersection{wxApp::GetVendorName}\label{wxappgetvendorname}
 
 \constfunc{wxString}{GetVendorName}{\void}
 \membersection{wxApp::GetVendorName}\label{wxappgetvendorname}
 
 \constfunc{wxString}{GetVendorName}{\void}


@@ -207,6 +275,54 @@ attract users attention to the application, you may use
 to do it.
 
 
 to do it.
 
 

+\membersection{wxApp::IsMainLoopRunning}\label{wxappismainlooprunning}
+
+\func{static bool}{IsMainLoopRunning}{\void}
+
+Returns \true if the main event loop is currently running, i.e. if the
+application is inside \helpref{OnRun}{wxapponrun}.
+
+This can be useful to test whether events can be dispatched. For example,
+if this function returns \false, non-blocking sockets cannot be used because
+the events from them would never be processed.
+
+
+\membersection{wxApp::MacNewFile}\label{wxappmacnewfile}
+
+\func{void}{MacNewFile}{\void}
+
+Mac specific. Called in response of an "open-application" Apple event.
+Override this to create a new document in your app.
+
+\membersection{wxApp::MacOpenFile}\label{wxappmacopenfile}
+
+\func{void}{MacOpenFile}{\param{const wxString\& }{fileName}}
+
+Mac specific. Called in response of an "open-document" Apple event. You need to 
+override this method in order to open a document file after the
+user double clicked on it or if the document file was dropped
+on either the running application or the application icon in
+Finder.
+
+\membersection{wxApp::MacOpenURL}\label{wxappmacopenurl}
+
+\func{void}{MacOpenURL}{\param{const wxString\& }{url}}
+
+Mac specific. Called in response of a "get-url" Apple event.
+
+\membersection{wxApp::MacPrintFile}\label{wxappmacprintfile}
+
+\func{void}{MacPrintFile}{\param{const wxString\& }{fileName}}
+
+Mac specific. Called in response of a "print-document" Apple event.
+
+
+\membersection{wxApp::MacReopenApp}\label{wxappmacreopenapp}
+
+\func{void}{MacReopenApp}{\void}
+
+Mac specific. Called in response of a "reopen-application" Apple event.
+

 \membersection{wxApp::MainLoop}\label{wxappmainloop}
 
 \func{virtual int}{MainLoop}{\void}
 \membersection{wxApp::MainLoop}\label{wxappmainloop}
 
 \func{virtual int}{MainLoop}{\void}


@@ -255,25 +371,28 @@ Returns 0 under X, and the wParam of the WM\_QUIT message under Windows.
 %%\helpref{wxWindow::OnCharHook}{wxwindowoncharhook}, \helpref{wxDialog::OnCharHook}{wxdialogoncharhook}
 
 
 %%\helpref{wxWindow::OnCharHook}{wxwindowoncharhook}, \helpref{wxDialog::OnCharHook}{wxdialogoncharhook}
 
 

-\membersection{wxApp::OnAssert}\label{wxapponassert}
+\membersection{wxApp::OnAssertFailure}\label{wxapponassertfailure}

 
 

-\func{void}{OnAssert}{\param{const wxChar }{*file}, \param{int }{line}, \param{const wxChar }{*cond}, \param{const wxChar }{*msg}}
+\func{void}{OnAssertFailure}{\param{const wxChar }{*file}, \param{int }{line}, \param{const wxChar }{*func}, \param{const wxChar }{*cond}, \param{const wxChar }{*msg}}

 
 This function is called when an assert failure occurs, i.e. the condition
 specified in \helpref{wxASSERT}{wxassert} macro evaluated to {\tt false}.
 It is only called in debug mode (when {\tt \_\_WXDEBUG\_\_} is defined) as
 asserts are not left in the release code at all.
 
 
 This function is called when an assert failure occurs, i.e. the condition
 specified in \helpref{wxASSERT}{wxassert} macro evaluated to {\tt false}.
 It is only called in debug mode (when {\tt \_\_WXDEBUG\_\_} is defined) as
 asserts are not left in the release code at all.
 

-The base class version show the default assert failure dialog box proposing to
+The base class version shows the default assert failure dialog box proposing to

 the user to stop the program, continue or ignore all subsequent asserts.
 
 \wxheading{Parameters}
 
 the user to stop the program, continue or ignore all subsequent asserts.
 
 \wxheading{Parameters}
 

-\docparam{file}{the name of the source file where the assert occured}
+\docparam{file}{the name of the source file where the assert occurred}
+
+\docparam{line}{the line number in this file where the assert occurred}

 
 

-\docparam{line}{the line number in this file where the assert occured}
+\docparam{func}{the name of the function where the assert occurred, may be
+empty if the compiler doesn't support C99 \texttt{\_\_FUNCTION\_\_}}

 
 

-\docparam{cond}{the condition of the failed assert in string form}
+\docparam{cond}{the condition of the failed assert in text form}

 
 \docparam{msg}{the message specified as argument to 
 \helpref{wxASSERT\_MSG}{wxassertmsg} or \helpref{wxFAIL\_MSG}{wxfailmsg}, will
 
 \docparam{msg}{the message specified as argument to 
 \helpref{wxASSERT\_MSG}{wxassertmsg} or \helpref{wxFAIL\_MSG}{wxfailmsg}, will


@@ -331,7 +450,7 @@ Return {\tt true} to continue normal execution or {\tt false} to return
 \helpref{OnInitCmdLine}{wxapponinitcmdline}
 
 
 \helpref{OnInitCmdLine}{wxapponinitcmdline}
 
 

-\membersection{wxApp::OnExceptionInMainLoop}{wxapponexceptioninmainloop}
+\membersection{wxApp::OnExceptionInMainLoop}\label{wxapponexceptioninmainloop}

 
 \func{virtual bool}{OnExceptionInMainLoop}{\void}
 
 
 \func{virtual bool}{OnExceptionInMainLoop}{\void}
 


@@ -430,7 +549,6 @@ work and, in fact, probably won't.
 %%\helpref{wxWindow::Close}{wxwindowclose},\rtfsp
 %%\helpref{wxWindow::OnCloseWindow}{wxwindowonclosewindow},\rtfsp
 %%\helpref{wxCloseEvent}{wxcloseevent},\rtfsp
 %%\helpref{wxWindow::Close}{wxwindowclose},\rtfsp
 %%\helpref{wxWindow::OnCloseWindow}{wxwindowonclosewindow},\rtfsp
 %%\helpref{wxCloseEvent}{wxcloseevent},\rtfsp

-%%\helpref{wxApp::OnQueryEndSession}{wxapponqueryendsession}

 
 
 \membersection{wxApp::OnInit}\label{wxapponinit}
 
 
 \membersection{wxApp::OnInit}\label{wxapponinit}


@@ -459,42 +577,6 @@ Called from \helpref{OnInit}{wxapponinit} and may be used to initialize the
 parser with the command line options for this application. The base class
 versions adds support for a few standard options only.
 
 parser with the command line options for this application. The base class
 versions adds support for a few standard options only.
 

-
-\membersection{wxApp::OnQueryEndSession}\label{wxapponqueryendsession}
-
-\func{void}{OnQueryEndSession}{\param{wxCloseEvent\& }{event}}
-
-This is an event handler function called when the operating system or GUI session is
-about to close down. Typically, an application will try to save unsaved documents
-at this point.
-
-If \helpref{wxCloseEvent::CanVeto}{wxcloseeventcanveto} returns true, the application
-is allowed to veto the shutdown by calling \helpref{wxCloseEvent::Veto}{wxcloseeventveto}.
-The application might veto the shutdown after prompting for documents to be saved, and the
-user has cancelled the save.
-
-Use the EVT\_QUERY\_END\_SESSION event table macro to handle query end session events.
-
-You should check whether the application is forcing the deletion of the window
-using \helpref{wxCloseEvent::GetForce}{wxcloseeventgetforce}. If this is true,
-destroy the window using \helpref{wxWindow::Destroy}{wxwindowdestroy}.
-If not, it is up to you whether you respond by destroying the window.
-
-The default handler calls \helpref{wxWindow::Close}{wxwindowclose} on the top-level window,
-and vetoes the shutdown if Close returns false. This will be sufficient for many applications.
-
-\wxheading{Remarks}
-
-Under X, OnQueryEndSession is called in response to the `save session' event.
-
-Under Windows, OnQueryEndSession is called in response to the WM\_QUERYENDSESSION message.
-
-\wxheading{See also}
-
-\helpref{wxWindow::Close}{wxwindowclose},\rtfsp
-\helpref{wxCloseEvent}{wxcloseevent}\rtfsp
-
-

 \membersection{wxApp::OnRun}\label{wxapponrun}
 
 \func{virtual int}{OnRun}{\void}
 \membersection{wxApp::OnRun}\label{wxapponrun}
 
 \func{virtual int}{OnRun}{\void}


@@ -517,10 +599,13 @@ should return $0$ in case of successful termination.
 
 This function is called when an unhandled C++ exception occurs inside 
 \helpref{OnRun()}{wxapponrun} (the exceptions which occur during the program
 
 This function is called when an unhandled C++ exception occurs inside 
 \helpref{OnRun()}{wxapponrun} (the exceptions which occur during the program

-startup and shutdown might not be caught at all).
-Note that the exception type is lost by now, so if you want to really handle
-the exception you should override \helpref{OnRun()}{wxapponrun} and put a
-try/catch clause around the call to the base class version there.
+startup and shutdown might not be caught at all). Notice that by now the main
+event loop has been terminated and the program will exit, if you want to
+prevent this from happening (i.e. continue running after catching an exception)
+you need to override \helpref{OnExceptionInMainLoop}{wxapponexceptioninmainloop}.
+
+The default implementation shows information about the exception in debug build
+but does nothing in the release build.

 
 
 \membersection{wxApp::ProcessMessage}\label{wxappprocessmessage}
 
 
 \membersection{wxApp::ProcessMessage}\label{wxappprocessmessage}


@@ -578,37 +663,29 @@ If true is returned, more OnIdle processing is requested by one or more window.
 \helpref{wxIdleEvent}{wxidleevent}
 
 
 \helpref{wxIdleEvent}{wxidleevent}
 
 

-\membersection{wxApp::SetAppName}\label{wxappsetappname}
-
-\func{void}{SetAppName}{\param{const wxString\& }{name}}
-
-Sets the name of the application. The name may be used in dialogs
-(for example by the document/view framework). A default name is set by
-wxWidgets.
-
-\wxheading{See also}
+\membersection{wxApp::SetAppDisplayName}\label{wxappsetappdisplayname}

 
 

-\helpref{wxApp::GetAppName}{wxappgetappname}
+\func{void}{SetAppDisplayName}{\param{const wxString\& }{name}}

 
 

+Set the application name to be used in the user-visible places such as window
+titles. See \helpref{GetAppDisplayName}{wxappgetappdisplayname} for more about
+the differences between the display name and name.

 
 

-\membersection{wxApp::SetAuto3D}\label{wxappsetauto3d}

 
 

-\func{void}{SetAuto3D}{\param{const bool}{ auto3D}}
-
-Switches automatic 3D controls on or off.
-
-\wxheading{Parameters}
+\membersection{wxApp::SetAppName}\label{wxappsetappname}

 
 

-\docparam{auto3D}{If true, all controls will be created with 3D appearances unless
-overridden for a control or dialog. The default is true}
+\func{void}{SetAppName}{\param{const wxString\& }{name}}

 
 

-\wxheading{Remarks}
+Sets the name of the application. This name should be used for file names,
+configuration file entries and other internal strings. For the user-visible
+strings, such as the window titles, the application display name set by 
+\helpref{SetAppDisplayName}{wxappsetappdisplayname} is used instead.

 
 

-This has an effect on Windows only.
+By default the application name is set to the name of its executable file.

 
 \wxheading{See also}
 
 
 \wxheading{See also}
 

-\helpref{wxApp::GetAuto3D}{wxappgetauto3d}
+\helpref{wxApp::GetAppName}{wxappgetappname}

 
 
 \membersection{wxApp::SetClassName}\label{wxappsetclassname}
 
 
 \membersection{wxApp::SetClassName}\label{wxappsetclassname}


@@ -641,6 +718,22 @@ deleted. If false, the application will continue to run.}
 \helpref{wxApp shutdown overview}{wxappshutdownoverview}
 
 
 \helpref{wxApp shutdown overview}{wxappshutdownoverview}
 
 

+\membersection{wxApp::SetInstance}\label{wxappsetinstance}
+
+\func{static void}{SetInstance}{\param{wxAppConsole* }{app}}
+
+Allows external code to modify global \texttt{wxTheApp}, but you should really
+know what you're doing if you call it.
+
+\wxheading{Parameters}
+
+\docparam{app}{Replacement for the global application object.}
+
+\wxheading{See also}
+
+\helpref{wxApp::GetInstance}{wxappgetinstance}
+
+

 \membersection{wxApp::SetTopWindow}\label{wxappsettopwindow}
 
 \func{void}{SetTopWindow}{\param{wxWindow* }{window}}
 \membersection{wxApp::SetTopWindow}\label{wxappsettopwindow}
 
 \func{void}{SetTopWindow}{\param{wxWindow* }{window}}


@@ -661,6 +754,14 @@ needs to use the top window.
 \helpref{wxApp::GetTopWindow}{wxappgettopwindow}, \helpref{wxApp::OnInit}{wxapponinit}
 
 
 \helpref{wxApp::GetTopWindow}{wxappgettopwindow}, \helpref{wxApp::OnInit}{wxapponinit}
 
 

+\membersection{wxApp::SetVendorDisplayName}\label{wxappsetvendordisplayname}
+
+\func{void}{SetVendorDisplayName}{\param{const wxString\& }{name}}
+
+Set the vendor name to be used in the user-visible places. See
+\helpref{GetVendorDisplayName}{wxappgetvendordisplayname} for more about
+the differences between the display name and name.
+

 
 \membersection{wxApp::SetVendorName}\label{wxappsetvendorname}
 
 
 \membersection{wxApp::SetVendorName}\label{wxappsetvendorname}
 


@@ -677,13 +778,16 @@ wxWidgets.
 
 \membersection{wxApp::SetUseBestVisual}\label{wxappsetusebestvisual}
 
 
 \membersection{wxApp::SetUseBestVisual}\label{wxappsetusebestvisual}
 

-\func{void}{SetUseBestVisual}{\param{bool}{ flag}}
+\func{void}{SetUseBestVisual}{\param{bool}{ flag}, \param{bool}{ forceTrueColour = false}}

 
 Allows the programmer to specify whether the application will use the best visual
 on systems that support several visual on the same display. This is typically the
 case under Solaris and IRIX, where the default visual is only 8-bit whereas certain
 applications are supposed to run in TrueColour mode.
 
 
 Allows the programmer to specify whether the application will use the best visual
 on systems that support several visual on the same display. This is typically the
 case under Solaris and IRIX, where the default visual is only 8-bit whereas certain
 applications are supposed to run in TrueColour mode.
 

+If \arg{forceTrueColour} is true then the application will try to force
+using a TrueColour visual and abort the app if none is found.
+

 Note that this function has to be called in the constructor of the {\tt wxApp} 
 instance and won't have any effect when called later on.
 
 Note that this function has to be called in the constructor of the {\tt wxApp} 
 instance and won't have any effect when called later on.
 


@@ -727,7 +831,7 @@ messages immediately (otherwise it will be done during the next idle loop
 iteration), call \helpref{wxLog::FlushActive}{wxlogflushactive}.
 
 Calling Yield() recursively is normally an error and an assert failure is
 iteration), call \helpref{wxLog::FlushActive}{wxlogflushactive}.
 
 Calling Yield() recursively is normally an error and an assert failure is

-raised in debug build if such situation is detected. However if the the 
+raised in debug build if such situation is detected. However if the 

 {\it onlyIfNeeded} parameter is {\tt true}, the method will just silently
 return {\tt false} instead.
 
 {\it onlyIfNeeded} parameter is {\tt true}, the method will just silently
 return {\tt false} instead.