[Qt-interest] assert error in qmap "item_exists()"
Ulf-Alexander v. Ceumern-Lindenstjerna
ceumern at vrmagic.com
Mon Apr 12 17:15:47 CEST 2010
You forgot one small detail:
> while (i.hasNext()) {
i.next(); // <---------- insert this line
> if (i.value() == currentChannel) {...
Also:
Checking if the item exists is not required before inserting
This line will already do it for you:
> stageToChannelMap[stage] = channel;
This should simplify your mapStageToChannel function:
> void PiezoJenaController::mapStageToChannel(PiezoStage stage, int
> channel)
> {
> stageToChannelMap[stage] = channel;
> }
Cheers, Ulf
> -----Original Message-----
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-
> bounces at trolltech.com] On Behalf Of Matthias Pospiech
> Sent: Monday, April 12, 2010 4:58 PM
> To: qt-interest at trolltech.com
> Subject: [Qt-interest] assert error in qmap "item_exists()"
>
> The assert error happens in qmap.h in this line:
> Q_DECLARE_ASSOCIATIVE_ITERATOR(Map)
>
> The QMap I am using contains 3 values which I can insert with no
> problem
> or error.
> However if I try to access the value (last line) I get this assertion:
>
> QMapIterator<PiezoStage, int> i(stageToChannelMap);
> while (i.hasNext()) {
> if (i.value() == currentChannel) {...
>
>
> The map is filled using:
>
> piezoController->mapStageToChannel(PiezoJenaController::X, 0);
> piezoController->mapStageToChannel(PiezoJenaController::Y, 1);
> piezoController->mapStageToChannel(PiezoJenaController::Z, 2);
>
> with:
>
> void PiezoJenaController::mapStageToChannel(PiezoStage stage, int
> channel)
> {
> if (stageToChannelMap.contains(stage)) {
> stageToChannelMap[stage] = channel;
> } else {
> stageToChannelMap.insert(stage, channel);
> }
> }
>
>
> What am I possibly doing wrong?
> Matthias
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