What is two-phase name lookup?
This is the process specified by the standard for looking up names in templates. It is called “two-phase name lookup” because it divides names used in a template into two categories (dependent and non-dependent) that are resolved at different times. It was introduced into the draft standard some time in 1993 or 1994 but unfortunately has not been implemented by many vendors until quite recently. It makes name resolution more reliable, but is incompatible with a lot of older template code. The rules specifying exactly which names are considered dependent and which non-dependent are mostly intuitive, but with some corner cases. They can be found in section 14.6 of the standard.
This is the process specified by the standard for looking up names in templates. It is called “two-phase name lookup” because it divides names used in a template into two categories (dependent and non-dependent) that are resolved at different times. It was introduced into the draft standard some time in 1993 or 1994 but unfortunately has not been implemented by many vendors until quite recently. It makes name resolution more reliable, but is incompatible with a lot of older template code. The rules specifying exactly which names are considered dependent and which non-dependent are mostly intuitive, but with some corner cases. They can be found in section 14.6 of the standard.
