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Code compiles with g++ 3.3 but not g++ 4.4
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Join Date: Feb 2008
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With this code:
http://www.rpi.edu/~doriad/Daniweb/maxflow/
If I run
with g++ 3.3, everything works fine. However if I run the same command with g++ 4.4, I get this error:
Does anyone know how I can get this to work with g++ 4.4?
Thanks!
David
http://www.rpi.edu/~doriad/Daniweb/maxflow/
If I run
C++ Syntax (Toggle Plain Text)
with g++ 3.3, everything works fine. However if I run the same command with g++ 4.4, I get this error:
C++ Syntax (Toggle Plain Text)
Does anyone know how I can get this to work with g++ 4.4?
Thanks!
David
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#2 Oct 16th, 2009
It compiles ok with VC++2008 Express too. I don't have g++ 4.4 so I can't test it.
Last edited by Ancient Dragon; Oct 16th, 2009 at 2:47 pm.
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#3 Oct 17th, 2009
I had to instantiate the constructor by adding this to the instances.inc file:
Does anyone understand why / know if the compiler can be told to do this automatically? I thought the whole point of templates was so you did NOT have to know the types that would be used?
Thanks,
Dave
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Does anyone understand why / know if the compiler can be told to do this automatically? I thought the whole point of templates was so you did NOT have to know the types that would be used?
Thanks,
Dave
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#4 Oct 17th, 2009
The reason (for good/bad) is that when the compiler hits instances.inc.
It has not seen the definition of graph.
If you put include instances at the end of graph.cpp all is fine.
Note that you only need the template instance for the class e.g.
[in the same way that if you provide an explicit template function you should not explicitly instantiate it. ]
It has not seen the definition of graph.
If you put include instances at the end of graph.cpp all is fine.
Note that you only need the template instance for the class e.g.
template class Graph<int,int,int>; since all the methods for the class are build. This should have been flaged as an error by VC++. [in the same way that if you provide an explicit template function you should not explicitly instantiate it. ]
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