Re: Can you specialize the Template operator==

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.language
Date:
Fri, 9 May 2008 12:05:49 -0400
Message-ID:
<eLXUN6esIHA.6096@TK2MSFTNGP06.phx.gbl>
3DCoderGuy <nobody@nospam.com> wrote:

I'm trying to specialize the operator== for my template, here is my
code
#define DOUBLE_EPSILON (1e-6)
#define FLOAT_EPSILON (1e-4f)

bool const operator==(const XYZPoint<T> &xyzTest) const


I assume this is a member function inside something like

template <typename T> class XYZPoint {...};

template<typename T>
bool const operator==(const XYZPoint<float> &xyzTest) const


This is not a specialization of the above, but an overload. The T here
is unrelated to the T which is the class' template parameter. Further,
this overload will never be selected in practice, because in any natural
invocation syntax, T is non-deducible (it doesn't appear anywhere in the
function signature).

Apparently, you want to specialize a member function of class template.
Such a specialization must go outside the class definition, and looks
like this:

template<>
bool const XYZPoint<float>::operator==(const XYZPoint<float>& xyzTest)
const;

--
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    Igor Tandetnik

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