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expected seems to be working

v1
Brett 2024-02-03 17:09:59 -05:00
parent f3b92c3c2c
commit c2387e6564
1 changed files with 82 additions and 30 deletions
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110
include/blt/std/utility.h
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@ -235,7 +235,7 @@ namespace blt
template<class Err = E, std::enable_if_t<
!std::is_same_v<remove_cvref_t<Err>, unexpected> && !std::is_same_v<remove_cvref_t<Err>, std::in_place_t> &&
std::is_constructible_v<E, Err>, bool> = true>
constexpr explicit unexpected(Err&& e): e(std::forward(e))
constexpr explicit unexpected(Err&& e): e(std::forward<Err>(e))
{}
template<class... Args, std::enable_if_t<std::is_constructible_v<E, Args...>, bool> = true>
@ -315,6 +315,19 @@ namespace blt
{
protected:
std::variant<T, E> v;
template<typename U, typename G>
inline static constexpr bool eight_insanity_v =
std::is_constructible_v<T, expected<U, G>&> || std::is_constructible_v<T, expected<U, G>> ||
std::is_constructible_v<T, const expected<U, G>&> || std::is_constructible_v<T, const expected<U, G>> ||
std::is_convertible_v<expected<U, G>&, T> || std::is_convertible_v<expected<U, G>, T> ||
std::is_convertible_v<const expected<U, G>&, T> || std::is_convertible_v<const expected<U, G>, T>;
template<typename U, typename G>
inline static constexpr bool four_insanity_v =
std::is_constructible_v<unexpected<E>, expected<U, G>&> || std::is_constructible_v<unexpected<E>, expected<U, G>> ||
std::is_constructible_v<unexpected<E>, const expected<U, G>&> || std::is_constructible_v<unexpected<E>, const expected<U, G>>;
public:
template<typename std::enable_if_t<std::is_default_constructible_v<T>, bool> = true>
constexpr expected() noexcept: v(T())
@ -328,13 +341,36 @@ namespace blt
/*
* (4)...(5)
*/
template<class U, class G, class UF = std::add_lvalue_reference_t<const U>, class GF = const G&, std::enable_if_t<
(!std::is_convertible_v<UF, T> || !std::is_convertible_v<GF, E>) && (std::is_constructible_v<T, UF> || std::is_void_v<U>) &&
std::is_constructible_v<E, GF> && !eight_insanity_v < U, G>&& !four_insanity_v<U, G>, bool> = true>
template<class U, class G>
constexpr explicit expected(const expected<U, G>& other)
constexpr explicit expected(const expected<U, G>& other):
v(other.has_value() ? std::forward<UF>(*other) : std::forward<GF>(other.error()))
{}
template<class U, class G>
constexpr explicit expected(expected<U, G>&& other)
template<class U, class G, class UF = U, class GF = G, std::enable_if_t<
(!std::is_convertible_v<UF, T> || !std::is_convertible_v<GF, E>) && (std::is_constructible_v<T, UF> || std::is_void_v<U>) &&
std::is_constructible_v<E, GF> && !eight_insanity_v < U, G>&& !four_insanity_v<U, G>, bool> = true>
constexpr explicit expected(expected<U, G>&& other):
v(other.has_value() ? std::forward<UF>(*other) : std::forward<GF>(other.error()))
{}
template<class U, class G, class UF = std::add_lvalue_reference_t<const U>, class GF = const G&, std::enable_if_t<
(std::is_convertible_v<UF, T> && std::is_convertible_v<GF, E>) && (std::is_constructible_v<T, UF> || std::is_void_v<U>) &&
std::is_constructible_v<E, GF> && !eight_insanity_v < U, G>&& !four_insanity_v<U, G>, bool> = true>
constexpr expected(const expected<U, G>& other):
v(other.has_value() ? std::forward<UF>(*other) : std::forward<GF>(other.error()))
{}
template<class U, class G, class UF = U, class GF = G, std::enable_if_t<
(std::is_convertible_v<UF, T> && std::is_convertible_v<GF, E>) && (std::is_constructible_v<T, UF> || std::is_void_v<U>) &&
std::is_constructible_v<E, GF> && !eight_insanity_v < U, G>&& !four_insanity_v<U, G>, bool> = true>
constexpr expected(expected<U, G>&& other):
v(other.has_value() ? std::forward<UF>(*other) : std::forward<GF>(other.error()))
{}
@ -342,59 +378,75 @@ namespace blt
* (6)
*/
template<class U = T, std::enable_if_t<!std::is_convertible_v<U, T>, bool> = true>
constexpr explicit expected(U&& v)
template<class U = T, std::enable_if_t<!std::is_convertible_v<U, T> &&
!std::is_same_v<remove_cvref_t<T>, void> &&
!std::is_same_v<remove_cvref_t<U>, std::in_place_t> &&
!std::is_same_v<expected, remove_cvref_t<U>> &&
std::is_constructible_v<T, U> &&
!std::is_same_v<remove_cvref_t<U>, unexpected<U>> &&
!std::is_same_v<remove_cvref_t<U>, expected<T, E>>, bool> = true>
constexpr explicit expected(U&& v): v(T(std::forward<U>(v)))
{}
template<class U = T, std::enable_if_t<std::is_convertible_v<U, T>, bool> = true>
constexpr expected(U&& v)
template<class U = T, std::enable_if_t<std::is_convertible_v<U, T> &&
!std::is_same_v<remove_cvref_t<T>, void> &&
!std::is_same_v<remove_cvref_t<U>, std::in_place_t> &&
!std::is_same_v<expected, remove_cvref_t<U>> &&
std::is_constructible_v<T, U> &&
!std::is_same_v<remove_cvref_t<U>, unexpected<U>> &&
!std::is_same_v<remove_cvref_t<U>, expected<T, E>>, bool> = true>
constexpr expected(U&& v): v(T(std::forward<U>(v)))
{}
/*
* (7)
*/
template<class G, std::enable_if_t<!std::is_convertible_v<const G&, E>, bool> = true>
constexpr explicit expected(const unexpected<G>& e)
template<class G, class GF = std::add_const_t<std::add_lvalue_reference_t<G>>, std::enable_if_t<
!std::is_convertible_v<const G&, E> && std::is_constructible_v<E, GF>, bool> = true>
constexpr explicit expected(const unexpected<G>& e): v(std::forward<GF>(e.error()))
{}
template<class G, std::enable_if_t<std::is_convertible_v<const G&, E>, bool> = true>
constexpr expected(const unexpected<G>& e)
template<class G, class GF = std::add_const_t<std::add_lvalue_reference_t<G>>, std::enable_if_t<
std::is_convertible_v<const G&, E> && std::is_constructible_v<E, GF>, bool> = true>
constexpr expected(const unexpected<G>& e): v(std::forward<GF>(e.error()))
{}
/*
* (8)
*/
template<class G, std::enable_if_t<!std::is_convertible_v<G, E>, bool> = true>
constexpr explicit expected(const unexpected<G>& e)
template<class G, class GF = std::add_const_t<std::add_lvalue_reference_t<G>>, std::enable_if_t<
!std::is_convertible_v<G, E> && std::is_constructible_v<E, GF>, bool> = true>
constexpr explicit expected(unexpected<G>&& e): v(std::forward<GF>(e.error()))
{}
template<class G, std::enable_if_t<std::is_convertible_v<G, E>, bool> = true>
constexpr expected(const unexpected<G>& e)
template<class G, class GF = std::add_const_t<std::add_lvalue_reference_t<G>>, std::enable_if_t<
std::is_convertible_v<G, E> && std::is_constructible_v<E, GF>, bool> = true>
constexpr expected(unexpected<G>&& e): v(std::forward<GF>(e.error()))
{}
/*
* (9)...(13)
*/
template<class... Args>
constexpr explicit expected(std::in_place_t, Args&& ... args)
template<class... Args, std::enable_if_t<std::is_constructible_v<T, Args...>, bool> = true>
constexpr explicit expected(std::in_place_t, Args&& ... args): v(T(std::forward<Args>(args)...))
{}
template<class U, class... Args>
constexpr explicit expected(std::in_place_t, std::initializer_list<U> il, Args&& ... args)
template<class U, class... Args, std::enable_if_t<std::is_constructible_v<T, std::initializer_list<U>&, Args...>, bool> = true>
constexpr explicit expected(std::in_place_t, std::initializer_list<U> il, Args&& ... args): v(T(il, std::forward<Args>(args)...))
{}
template<class... Args>
constexpr explicit expected(std::in_place_t) noexcept
// template<class... Args, std::enable_if_t<std::is_same_v<remove_cvref_t<T>, void>, bool> = true>
// constexpr explicit expected(std::in_place_t) noexcept: v(T())
// {}
template<class... Args, std::enable_if_t<std::is_constructible_v<E, Args...>, bool> = true>
constexpr explicit expected(unexpect_t, Args&& ... args): v(E(std::forward<Args>(args)...))
{}
template<class... Args>
constexpr explicit expected(unexpect_t, Args&& ... args)
{}
template<class U, class... Args>
constexpr explicit expected(unexpect_t, std::initializer_list<U> il, Args&& ... args)
template<class U, class... Args, std::enable_if_t<std::is_constructible_v<E, std::initializer_list<U>&, Args...>, bool> = true>
constexpr explicit expected(unexpect_t, std::initializer_list<U> il, Args&& ... args): v(E(il, std::forward<Args>(args)...))
{}
expected& operator=(const expected& copy) = delete;