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Jonathan Wakely 9e58988061 libstdc++: Define <=> for tuple, optional and variant 
Another piece of P1614R2.

	* include/std/optional (operator<=>(optional<T>, optional<U>))
	(operator<=>(optional<T>, nullopt), operator<=>(optional<T>, U)):
	Define for C++20.
	* include/std/tuple (__tuple_cmp): New helper function for <=>.
	(operator<=>(tuple<T...>, tuple<U>...)): Define for C++20.
	* include/std/variant (operator<=>(variant<T...>, variant<T...>))
	(operator<=>(monostate, monostate)): Define for C++20.
	* testsuite/20_util/optional/relops/three_way.cc: New test.
	* testsuite/20_util/tuple/comparison_operators/three_way.cc: New test.
	* testsuite/20_util/variant/89851.cc: Move to ...
	* testsuite/20_util/variant/relops/89851.cc: ... here.
	* testsuite/20_util/variant/90008.cc: Move to ...
	* testsuite/20_util/variant/relops/90008.cc: ... here.
	* testsuite/20_util/variant/relops/three_way.cc: New test.
2020-02-21 17:12:39 +00:00
..
backward Update copyright years. 2020-01-01 12:51:42 +01:00
bits libstdc++: Issues with range access CPOs (P2091R0) 2020-02-20 13:22:29 +00:00
c Update copyright years. 2020-01-01 12:51:42 +01:00
c_compatibility Update copyright years. 2020-01-01 12:51:42 +01:00
c_global Update copyright years. 2020-01-01 12:51:42 +01:00
c_std Update copyright years. 2020-01-01 12:51:42 +01:00
debug Update copyright years. 2020-01-01 12:51:42 +01:00
decimal Update copyright years. 2020-01-01 12:51:42 +01:00
experimental libstdc++: "safe" in several library names is misleading (LWG 3379) 2020-02-19 12:46:57 +00:00
ext libstdc++: Implement P1878R1 "Constraining Readable Types" 2020-02-07 16:58:43 +00:00
parallel Update copyright years. 2020-01-01 12:51:42 +01:00
precompiled Update copyright years. 2020-01-01 12:51:42 +01:00
pstl Restore enable_if lost during original import of pstl 2019-12-11 03:38:24 +00:00
std libstdc++: Define <=> for tuple, optional and variant 2020-02-21 17:12:39 +00:00
tr1 Update copyright years. 2020-01-01 12:51:42 +01:00
tr2 Update copyright years. 2020-01-01 12:51:42 +01:00
Makefile.am libstdc++: Add lightweight replacement for std::numeric_limits (PR 92546) 2020-02-17 15:11:04 +00:00
Makefile.in libstdc++: Add lightweight replacement for std::numeric_limits (PR 92546) 2020-02-17 15:11:04 +00:00