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| Extending an existing widget... [message #50673] |
Mon, 03 December 2018 04:33  |
ptkacz
Messages: 89
Registered: March 2017
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Hi All,
I'm attempting to extend EditValue, based on how a class like EditString is defined, found listed within the EditCtrl.h header file. The definition looks like:
class ExtendedEdit : public EditValue<WString, ConvertString> {
public:
typedef ExtendedEdit CLASSNAME;
...
Unfortunately, the error error: expected template-name before '<' token results in being generated. If EditCtrl.h is included, a whole slew of compilation errors result. Since EditCtrl.h's parent file is, CtrlLib.h that's included instead.
How is it that class EditString : public EditValue<WString, ConvertString> {...}
Peter
PS: It's a shame that there are header files that include some useful functions or methods, and when included, bomb because they are dependant on other libraries being included prior. From a software design perspective, shouldn't each library file stand on it's own with the expected includes?
[Updated on: Mon, 03 December 2018 04:37] Report message to a moderator |
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| Re: Extending an existing widget... [message #50674 is a reply to message #50673] |
Mon, 03 December 2018 06:57  |
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Hi Peter,
Silly guess: The EditValue (and everything else in U++  ) is defined in namespace Upp. Your code snippet doesn't mention this, so maybe you forgot to use the namespace: Upp::EditValue<Upp:WString, Upp::convertString>? Or wrap the whole thing in namespace Upp { ... }, but that would define your ExtendedEdit in Upp namespace as well, which might not be exactly what you want.
Best regards,
Honza
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