[cfe-dev] Roadmap for a Concepts implementation P0734R0, currently merged into C++20 draft

Hubert Tong via cfe-dev cfe-dev at lists.llvm.org
Mon Nov 20 09:15:36 PST 2017

On Sun, Nov 19, 2017 at 7:39 PM, Saar Raz <saar at raz.email> wrote:

> Attached is a patch file that implements point 1 with some comments as to
> what should be done next.
Saar, I believe cfe-commits is the mailing list for patch reviews. I also
find Phabricator to be helpful (but it is not mandatory).

Some comments:
The patch would obviously break tests, so test updates are needed. I would
prefer to see if some tests are salvageable by modifying them to use the
new syntax (and then leaving them disabled for now).
The error message at line 132 of the patch still refers to "concept" as a
This particular error message is also more likely to be orphaned than not
depending on how the parsing is implemented.

template <typename T>
inline concept C = true;
//     ^
// error: expected unqualified-id

template <typename T>
concept constexpr C = true;
//      ^
// error: expected unqualified-id
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