Tomasz Kamiński 8defa4b8b1 libstdc++: Constrain views::adjacent(_transform)?<0> to forward_ranges. ...

This resolves LWG 4098, "views::adjacent<0> should reject non-forward ranges"
which was approved in Sofia 2024.

libstdc++-v3/ChangeLog:

	* include/std/ranges (_AdjacentTransform::operator())
	(_Adjacent::operator()): Require forward_range for N == 0.
	* testsuite/std/ranges/adaptors/adjacent/1.cc: Test if input_ranges
	are rejected.
	* testsuite/std/ranges/adaptors/adjacent_transform/1.cc: Likewise.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>

2026-04-24 12:29:56 +02:00

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libstdc++: Constrain views::adjacent(_transform)?<0> to forward_ranges.

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libstdc++: Fix some -Wsign-compare warnings in headers

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