GCC behave different for cv-qualifier function.

[Jonathan Wakely]

On 14 December 2010 07:26, zhang qingshan wrote:
> std 8.3.2/1 says
>
> Cv-qualified references are ill-formed except when the cv-qualifiers
> are introduced through
> the use of a typedef (7.1.3) or of a template type argument (14.3), in
> which case the cv-qualifiers are ignored
>
> following code is tested at GCC 4.5.0.
>
> template <typename T>
> void fun(const T&t);
> void foo();
> void Test() {
>  fun(foo);
> }
>
> It seems that, fun should be resolved as void (void (&)()), as const
> is ignore here.

No.

> However, if I try to link this problem, the link complains:
>
> test.cpp:(.text+0x1c): undefined reference to `void fun<void
> ()()>(void ( const&)())'
>
> Why the fun here is resolved as void fun<void()()>(void ( const &)())
> rather than void fun<void()()>(void ( &)()) ?

This is the same question you asked a few days ago.  const T& is NOT a
const-qualified reference, it is a reference to a const T.

Please find a more suitable forum to learn C++ than this mailing list,
you keep asking the same basic questions.