Re: Android ndk gcc problem with inherited attribute

From:
Bo Persson <bop@gmb.dk>
Newsgroups:
comp.lang.c++
Date:
Wed, 21 Aug 2013 22:37:07 +0200
Message-ID:
<b7kmnlFjro3U1@mid.individual.net>
Edoardo Tagome wrote 2013-08-21 18:17:

Hi,
     I've got another problem (as in "Inheritance and friendship" post)
and I don't know if it comes from a C++ misuse or from a compiler error.

Visual Studio 2010 builds correctly but android ndk r9 gcc returns an
error.

The error refers to the line
     mInt += 1 ;
and is:
     error: 'mInt' was not declared in this scope

I think I can solve changing the line in
                 Base<T>::mInt += 1 ;
... but why? My original code was wrong? Are there anydownsides with the
change I've applied? Or is it a good thing to do everytime?


Templated base classes are not searched for members, partly because they
can be specialized later and have different members. MS hasn't
implemented this rule yet.

If you don't want to explicitly name the base class everywhere, you can
also use 'this->mInt' to show that it must be a member. That works
equally well for both MSVC and gcc.

There are no downsides except for the extra typing. :-)

Bo Persson

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