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Re: Change in template class handling?
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Re: Change in template class handling?


  • Subject: Re: Change in template class handling?
  • From: Chris Espinosa <email@hidden>
  • Date: Tue, 25 Apr 2006 15:48:39 -0700


On Apr 25, 2006, at 2:52 PM, Mark Wagner wrote:

A .cpp file containing the following code compiles on CodeWarrior 9
and Xcode 1.5/GCC 3.3, but not on Xcode 2.2/GCC 4.  It shouldn't
compile -- class TArrayOfObj has no member named "len" and there is no
global variable called "len", and pOiArray is a struct with no member
functions, not a class.  Was there some change in how GCC handles
template classes between 3.3 and 4?

template <class T> void TArrayOfObj<T>::setArrayLength( long lElements )
{
long currentLen = arrayLength();
if (lElements < currentLen)
deleteObjs(len, currentLen - len);

pOiArray->SetLen(lElements);

if (lElements > currentLen)
constructObjs(currentLen, lElements - currentLen);
}

I'd always start by preprocessing my source and seeing if some "helpful" header file was defining 'len" as a macro or global constant. One never knows.


the general answer to your question is that yes, gcc 4.x has stricter adherence to the C++ standard, which often makes loosely-written code break. If you are correct in saying that this shouldn't compile, and it doesn't, then gcc 4 is behaving correctly, right?

Chris
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