Please help with an "if statement" condition

[ayanda83]

Hi there, I want to compare two strings in an if statement condition as follows

if(meta->className() == "MyClass"){ //then do something}

if(meta->className() == "MyClass"){ //then do something}

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but the problem I am having is that meta->className() returns a string of type const char* which is incompatible to QString. Because of this, the "if" condition does not even evaluate instead it gives a warning - see attached picturewarning.png

[Radek]

if(QString(meta->className()) == "MyClass"){ //then do something}

if(QString(meta->className()) == "MyClass"){ //then do something}

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[anda_skoa]

but the problem I am having is that meta->className() returns a string of type const char* which is incompatible to QString.

The other operand is also const char*, there is no QString involved here.

Comparison of character arrays can be done via strcmp() functions such as http://qt-project.org/doc/qt-5/qbytearray.html#qstrncmp

Cheers,
_

[wysota]

Hi there, I want to compare two strings in an if statement condition as follows

if(meta->className() == "MyClass"){ //then do something}

if(meta->className() == "MyClass"){ //then do something}

To copy to clipboard, switch view to plain text mode 

but the problem I am having is that meta->className() returns a string of type const char* which is incompatible to QString. Because of this, the "if" condition does not even evaluate instead it gives a warning - see attached picturewarning.png

Qt4/Qt5 way:

if(meta->className() == QLatin1String("MyClass")) { ... }

if(meta->className() == QLatin1String("MyClass")) { ... }

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Qt5 only way:

if(meta->className() == QStringLiteral("MyClass")) { ... }

if(meta->className() == QStringLiteral("MyClass")) { ... }

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