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libstdc++: Fix constraints on std::expected<void, E> constructor [PR105153]

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libstdc++-v3/ChangeLog:

	PR libstdc++/105153
	* include/std/expected
	(expected<void,E>::expected(expected<U,G>&&)): Fix constraints.
	* testsuite/20_util/expected/cons.cc: Check constructor.
This commit is contained in:
Jonathan Wakely 2022-04-08 18:26:23 +01:00
parent 0dfaf56252
commit 7b4495d3c4
2 changed files with 20 additions and 2 deletions
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4
libstdc++-v3/include/std/expected
View file

@ -966,8 +966,8 @@ namespace __expected
}
template<typename _Up, typename _Gr>
requires is_void_v<_Tp>
&& is_constructible_v<_Er, const _Gr&>
requires is_void_v<_Up>
&& is_constructible_v<_Er, _Gr>
&& (!__cons_from_expected<_Up, _Gr>)
constexpr explicit(!is_convertible_v<_Gr, _Er>)
expected(expected<_Up, _Gr>&& __x)

18
libstdc++-v3/testsuite/20_util/expected/cons.cc
View file

@ -162,6 +162,22 @@ test_copy()
return true;
}
constexpr bool
test_pr105153()
{
struct E {
E(int&&) = delete;
E(const int&);
};
std::expected<void, E> e(std::expected<void, int>{});
static_assert( ! std::is_constructible_v<std::expected<void, int>,
std::expected<int, int>> );
return true;
}
int main()
{
test_default();
@ -172,4 +188,6 @@ int main()
static_assert( test_err() );
test_copy();
static_assert( test_copy() );
test_pr105153();
static_assert( test_pr105153() );
}