🚀 go-pugleaf

The following code illustrates a bug in the implementation of
templates in MS Visual C++ 4.0.

//___________begin code sample__________________________
// test.cpp

template <class T>
class VeryTesting
{     
	public: 
		VeryTesting();
		T& operator()();
		T 	m_T;
};

template <class T>
inline
VeryTesting<T>::VeryTesting () 
{
}

template <class T>
inline T& 
VeryTesting<T>::operator ()()
{
	return m_T;
}

//  Uncomment this block of code and it all works!
// template VeryTesting<double>;

class A
{
public :
	A(){}
	~A(){}

	VeryTesting<double>& test(VeryTesting<double>& fdTest)
	{
		fdTest() = 5.0; //error C2064: term does not evaluate to a function
		return fdTest;
	}
};

main()
{
	VeryTesting<double> f;
	f() = 5.0;
	A aObject;
	aObject.test(f);
}
//___________end code sample___________________________


The problem is that VeryTesting<double> is not instantiated correctly
by the MS Visual C++ 4.0 compiler. This results in the error message
that says function fdTest() does not evaluate to a function.

The code compiles under Borland 4.5.

So leads one to the question of how will compilers be vetted against a
standard when it comes?

Cheers,
Peter J Brock	http://www.magna.com.au/~peter

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