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Subject: Re: [SG10] __cpp_lib_constexpr_functions
From: Gabriel Dos Reis (gdr_at_[hidden])
Date: 2013-08-27 13:07:17


"Nelson, Clark" <clark.nelson_at_[hidden]> writes:

| > My instance on having few macros isn't just specific to constexpr.
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| >
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| > For 'constexpr' in particular, I do believe it is still too early.
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| > LWG
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| > doesn't even know what it wants. Having a new macro everytime that
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| > LWG
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| > changes its mind sound overkill. If the desire is to have a macro
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| > anyway, then I will repeat the suggestion I made previously: Have
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| > just one
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| > macro for constexpr, call it something, and have its value updated
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| > for
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| > new released of the committee draft.
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|
| Gaby, I don't understand what you're suggesting we should do.
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|
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| Here is the relevant excerpt from N3694:
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|
| +-----------------------------------------------------------------------------+
| | |Constexpr | | | | |
| |N3471|Library |20.2-20.4| | |<utility>|
| | |Additions: | | | | |
| | |utilities | | | | |
| |-----+--------------+---------| | |---------|
| | |Constexpr | | | | |
| |N3469|Library |20.11 |__cpp_lib_constexpr_functions|201210|<chrono> |
| | |Additions: | | | | |
| | |chrono | | | | |
| |-----+--------------+---------| | |---------|
| | |Constexpr | | | | |
| |N3470|Library |23.3 | | |<array> |
| | |Additions: | | | | |
| | |containers | | | | |
| +-----------------------------------------------------------------------------+
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|
|
| What are your proposed edits, if any?
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|
|
| Clark

To illustrate this on constexpr, I am suggesting to change the value of
__cpp_lib_constexpr_functions to last time WP draft was changed (date of
vote in Bristol) -- not just when a specific header was changed. Do not
tie it (as in the table) to any of the headers listed there. Remember
that any non-C C++ header can include any other header, so I don't see
much value in tieing the macros to a list of headers. I guess I am
saying ditch the 6th column.

-- Gaby


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