commit 679af7b1037ae8fd4fe3f7b22ba03673b1af8c98
author Jonathan Wakely <jwakely@redhat.com> Thu Feb 27 15:48:49 2025 +0000
committer Jonathan Wakely <redi@gcc.gnu.org> Wed Mar 26 14:41:23 2025 +0000
tree b2cce07b56c760666456943a4c9e8a33fca73ca1
parent 65670b788d4624d54b270d51ec846d93133e5c50

libstdc++: Add static_assertions to ranges::to adaptor factory [PR112803]

The standard requires that we reject attempts to create a ranges::to
adaptor for cv-qualified types and non-class types. Currently we only
diagnose it once the adaptor is used in a pipeline.

This adds static assertions to diagnose it immediately.

libstdc++-v3/ChangeLog:

	PR libstdc++/112803
	* include/std/ranges (ranges::to): Add static assertions to
	enforce Mandates conditions.
	* testsuite/std/ranges/conv/112803.cc: New test.

(cherry picked from commit a9cfcd0d9e3780c71442057f636f62a7142056cb)