Re: What the heck?

Kira Yamato wrote:
:: On 2007-11-07 03:06:04 -0500, John Femiani
:: <john.femiani@gmail.com> said:
::
::: My message does not show up at all. Here it is again:
:::
::: IN g++ 3.4.2 this does not compile:
:::
::: #include <iostream>
:::
:::
::: template<class T>
::: struct A {
::: int member;
::: };
:::
::: emplate<class T>
::: struct B: A<T>
::: {
::: void somefunc() {
::: std::cout << member << std::endl;
::: }
::: };
:::
:::
::: int main(int argc, char* argv[]){
::: B<int> b;
::: b.somefunc();
::: }
:::
:::
::: But it does on vc8.
:::
::: Should this compile? Is there a bug on vc8? or g++?
:::
::: g++ gives this error message:
:::
::: test.cpp:15: error: `member' undeclared (first use this function)
:::
::: replacing line 15 by:
:::
::: std::cout << this->member << std::endl;
::: fixes it.
:::
::: Also if I make A and B _not_ use templates all is fine.
:::
::: My question is, is this a g++ bug or a vc8 bug?
:::
::: -- John
::
:: You just discovered the "two-stage name lookup" with "dependent"
:: and "non-dependent" names.
::
:: The answer is in here:
:: http://gcc.gnu.org/onlinedocs/gcc/Name-lookup.html
::
:: It works on VC because, as I've been told, VC does not quite
:: follow the standard.

Not following the standard is considered an extension, so you have to
select the "Disable Language Extensions" option (/Za).

Bo Persson