Created on 2023-08-13.00:00:00 last changed 4 days ago
Proposed resolution:
This wording is relative to N4958.
Modify the [format.context] as indicated:
-1- An instance of basic_format_context holds formatting state consisting of the formatting arguments and the output iterator.
-?- The behavior of a program that adds specializations of basic_format_context is undefined. -2- Out shall model output_iterator<const charT&>.
The current wording allows users to specialize std::basic_format_context. However, an implementation is not likely to accept a program that uses the library in a way that would instantiate such a specialization, because [format.context] does not provide a complete description of the interface that such a specialization would need to have (e.g., it does not provide a means to initialize the exposition-only args_ member). Since the library was not designed to be able to work with user specializations of std::basic_format_context, declaring such specializations should be explicitly disallowed.
History | |||
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Date | User | Action | Args |
2023-09-17 08:39:58 | admin | set | messages: + msg13718 |
2023-08-13 00:00:00 | admin | create |