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libstdc++: Fix test that fails for C++20 

Also restore the test for 'a < a' that was removed by r12-2537 because
it is ill-formed. We still want to test operator< for tuple, we just
need to not use std::nullptr_t in that tuple type.

libstdc++-v3/ChangeLog:

	* testsuite/20_util/tuple/comparison_operators/overloaded.cc:
	Restore test for operator<.
	* testsuite/20_util/tuple/comparison_operators/overloaded2.cc:
	Adjust expected errors for C++20.
This commit is contained in:
Jonathan Wakely 2021-10-12 15:39:18 +01:00
parent 7481021364
commit 727137d6ca
2 changed files with 9 additions and 1 deletions
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6
libstdc++-v3/testsuite/20_util/tuple/comparison_operators/overloaded.cc
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@ -48,3 +48,9 @@ TwistedLogic operator<(const Compares&, const Compares&) { return {false}; }
auto a = std::make_tuple(nullptr, Compares{}, 2, 'U');
auto b = a == a;
#if ! __cpp_lib_three_way_comparison
// Not valid in C++20, because TwistedLogic doesn't model boolean-testable.
auto c = std::make_tuple("", Compares{}, 2, 'U');
auto d = c < c;
#endif

4
libstdc++-v3/testsuite/20_util/tuple/comparison_operators/overloaded2.cc
View File

@ -49,5 +49,7 @@ TwistedLogic operator<(const Compares&, const Compares&) { return {false}; }
auto a = std::make_tuple(nullptr, Compares{}, 2, 'U');
auto b = a < a;
// { dg-error "ordered comparison" "" { target *-*-* } 0 }
// { dg-error "no match for 'operator<'" "" { target c++20 } 0 }
// { dg-error "no match for .*_Synth3way|in requirements" "" { target c++20 } 0 }
// { dg-error "ordered comparison" "" { target c++17_down } 0 }
// { dg-error "not a return-statement" "" { target c++11_only } 0 }