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Jonathan Wakely dde19c600c
libstdc++: Implement LWG 3564 for ranges::transform_view
The _Iterator<true> type returned by begin() const uses const F& to
transform the elements, so it should use const F& to determine the
iterator's value_type and iterator_category as well.

This was accepted into the WP in July 2022.

libstdc++-v3/ChangeLog:

	* include/std/ranges (transform_view:_Iterator): Use const F&
	to determine value_type and iterator_category of
	_Iterator<true>, as per LWG 3564.
	* testsuite/std/ranges/adaptors/transform.cc: Check value_type
	and iterator_category.

Reviewed-by: Patrick Palka <ppalka@redhat.com>
2024-10-14 22:07:28 +01:00
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