Re: base class public type (non template and template base class)

From:
Victor Bazarov <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Mon, 20 Apr 2009 11:28:33 -0400
Message-ID:
<gsi4bh$k0q$1@news.datemas.de>
Hicham Mouline wrote:

This compiles

#include <iostream>

class Base {
public:
  typedef double type;
};

class Derived : public Base {
public:
  void f(type t) const {}
};

While this

template <typename T>
class Base {
public:
  typedef double type;
};

template <typename T>
class Derived : public Base<T> {
public:
  void f(type t) const {} // type has not been declared
};

This templated version requires

template <typename T>
class Derived : public Base<T> {
public:
  void f(typename Base<T>::type t) const {}
};

Is g++3.4 standard compliant here? Or is this a g++3.4 restriction?

writing
typename Base<T>::type
is tedious?

I tried to put type in a non template base class B of Base, but in Derived,
I still needed to qualify B::type


FAQ section 35. See "dependent name".

V
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