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C++ decltype troubles

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Started by Storyyeller June 14, 2011 07:35 PM

0 comments, last by Sneftel 12 years, 10 months ago

Storyyeller

215

Author

June 14, 2011 07:35 PM

How can I use decltype to access stuff declared in a class? Sorry, I don't know the technical terms for what I'm trying to do, but here's an example. No matter what I try, I can't get it to work.

struct Foo

{

	typedef int Bar;

};



int main()

{

	Foo f;

	decltype(f)::Bar x = 5;

	return 0;

}

I trust exceptions about as far as I can throw them.

Sneftel

1,788

June 14, 2011 08:06 PM

As currently implemented in compilers, that code is wrong; a modification to the standard which would allow it happened just a couple of months ago, though.

Workaround:





template<typename T>

struct BarGetter

{

	typedef typename T::Bar BarType;

};





int main()

{

	Foo f;

	BarGetter<decltype(f)>::BarType x = 5;

}