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GCC problem with VC++ code

Started by JDX_John Apr 8, 2009 at 2:35 PM 1 reply 850+ views

Original Post

Apr 8, 2009 at 2:35 PM

template <class T>
class TemplateClass
{
public:
	typedef std::map<std::string, T*> ObjectList;

	virtual ~ TemplateClass()
	{
		for(ObjectList::iterator it = objects.begin(); it !=objects.end(); ++it)
			delete it->second;
	}
private:
	ObjectList objects;
};

This seemingly innocuous code is fine under VC++ 2008, but breaks under GCC 4 (on the Mac) with errors like "variable 'it' is undefined". It doesn't seem to be pushing the boundaries on what's possible in C++, any thoughts on the problem and possible resolution?

jpetrie

793

jpetrie

Apr 8, 2009 at 2:47 PM

Use typename ObjectList::iterator (you may want to typedef this).

rip-off

Mod

445

rip-off

Apr 8, 2009 at 2:49 PM

The type iterator is a dependant typename (i.e. it depends on the template parameter). Use the "typename" keyword. IIRC it is required under MSVC too if you disable language extensions.

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