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From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-12-01 16:36:54

Beman Dawes wrote:
> Hum... I'll take your word for it, but to tell the truth I
> have trouble understanding what either ``this->member_name''
> or `BaseClass::member_name'' adds.

It makes 'member_name' identifier a dependent name (14.6.2, [temp.dep]),
thus deferring its resolution to the point of instantiation.

> And the format library case
> wasn't a member name at all, it was an enum name, IIRC.

Looking at the errors that triggered the discussion, they don't seem to be
related to two-phase name lookup at all:

    namespace boost {
    namespace io {
    enum format_error_bits { bad_format_string_bit = 1,
                            too_few_args_bit = 2, too_many_args_bit = 4,
                            out_of_range_bit = 8,
                            all_error_bits = 255, no_error_bits=0 };
    } // namespace io

    // ...

    template< class Ch, class Tr>
    basic_format<Ch,Tr>& basic_format<Ch,Tr> ::clear_bind(int argN)
    // cancel the binding of ONE argument, and clear()
    // ....
            if( exceptions() & out_of_range_bit )

    } // namespace boost

'out_of_range_bit' is defined in the namespace 'io', and there is no way it
can be found through a plain 'out_of_range_bit' (not
'io::out_of_range_bit'), two-phase name lookup or not :).


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