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Fix assertion for const instance of std::ordering

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The issue was that `capture_by_value` was meant to be specialized
by plain type, e.g. `capture_by_value<std::weak_ordering>`, but
the TMP in Decomposer did not properly throw away `const` (and
`volatile`) qualifiers, before taking the value of `capture_by_value`.
This commit is contained in:
Martin Hořeňovský
2024-04-08 11:02:22 +02:00
parent 0a6a2ce887
commit 71b11c4e33
2 changed files with 56 additions and 16 deletions
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35
tests/SelfTest/UsageTests/Compilation.tests.cpp
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@@ -357,6 +357,12 @@ namespace {
constexpr friend bool operator op( ZeroLiteralConsteval, \
TypeWithConstevalLit0Comparison ) { \
return false; \
} \
/* std::orderings only have these for ==, but we add them for all \
operators so we can test all overloads for decomposer */ \
constexpr friend bool operator op( TypeWithConstevalLit0Comparison, \
TypeWithConstevalLit0Comparison ) { \
return true; \
}
DEFINE_COMP_OP( < )
@@ -394,6 +400,21 @@ TEST_CASE( "#2555 - types that can only be compared with 0 literal implemented a
REQUIRE_FALSE( 0 != TypeWithConstevalLit0Comparison{} );
}
// We check all comparison ops to test, even though orderings, the primary
// motivation for this functionality, only have self-comparison (and thus
// have the ambiguity issue) for `==` and `!=`.
TEST_CASE( "Comparing const instances of type registered with capture_by_value",
"[regression][approvals][compilation]" ) {
auto const const_Lit0Type_1 = TypeWithLit0Comparisons{};
auto const const_Lit0Type_2 = TypeWithLit0Comparisons{};
REQUIRE( const_Lit0Type_1 == const_Lit0Type_2 );
REQUIRE( const_Lit0Type_1 <= const_Lit0Type_2 );
REQUIRE( const_Lit0Type_1 < const_Lit0Type_2 );
REQUIRE( const_Lit0Type_1 >= const_Lit0Type_2 );
REQUIRE( const_Lit0Type_1 > const_Lit0Type_2 );
REQUIRE_FALSE( const_Lit0Type_1 != const_Lit0Type_2 );
}
#endif // C++20 consteval
@@ -420,3 +441,17 @@ TEST_CASE("#2571 - tests compile types that have multiple implicit constructors
REQUIRE( mic1 > mic2 );
REQUIRE( mic1 >= mic2 );
}
#if defined( CATCH_CONFIG_CPP20_COMPARE_OVERLOADS )
// This test does not test all the related codepaths, but it is the original
// reproducer
TEST_CASE( "Comparing const std::weak_ordering instances must compile",
"[compilation][approvals][regression]" ) {
auto const const_ordering_1 = std::weak_ordering::less;
auto const const_ordering_2 = std::weak_ordering::less;
auto plain_ordering_1 = std::weak_ordering::less;
REQUIRE( const_ordering_1 == plain_ordering_1 );
REQUIRE( const_ordering_1 == const_ordering_2 );
REQUIRE( plain_ordering_1 == const_ordering_1 );
}
#endif