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Add constructor to Tuple on functors (RVO)

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sha512sum 2024-03-06 03:05:18 +00:00
parent a4f41f84b5
commit 9273af7163
2 changed files with 19 additions and 30 deletions
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45
include/utempl/tuple.hpp
View file

@ -18,10 +18,18 @@ template <typename, typename...>
struct TupleHelper;
template <std::size_t... Is, typename... Ts>
struct TupleHelper<std::index_sequence<Is...>, Ts...> : public TupleLeaf<Is, Ts>... {
struct TupleHelper<std::index_sequence<Is...>, Ts...> : public impl::TupleLeaf<Is, Ts>... {
inline constexpr bool operator==(const TupleHelper&) const = default;
};
template <typename T>
struct Process {
using type = decltype(Overloaded(
[]<typename TT>(TT&&) -> std::remove_cvref_t<TT> {},
[]<std::size_t N>(const char(&)[N]) -> const char* {}
)(std::declval<T>()));
};
} // namespace impl
template <typename... Ts>
@ -51,17 +59,14 @@ inline constexpr auto Get(T&& arg) -> decltype(get<I>(std::forward<T>(arg))) {
};
template <typename... Ts>
struct Tuple : public impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...> {
struct Tuple : impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...> {
template <typename... TTs>
inline constexpr Tuple(TTs&&... args) :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{std::forward<TTs>(args)}...} {};
inline constexpr Tuple(const Ts&... args) :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{args}...} {};
inline constexpr Tuple(Ts&... args) :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{args}...} {};
template <std::invocable... Fs>
inline constexpr Tuple(Fs&&... fs) requires (!std::invocable<Ts> || ...) :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{fs()}...} {};
inline constexpr Tuple(Ts&&... args) :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{std::move(args)}...} {};
inline constexpr Tuple(const Ts&&... args) :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{args}...} {};
inline constexpr Tuple(const Tuple&) = default;
inline constexpr Tuple(Tuple&&) = default;
@ -71,17 +76,14 @@ struct Tuple : public impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...> {
inline constexpr Tuple& operator=(Tuple&) = default;
inline constexpr Tuple() :
impl::TupleHelper<std::index_sequence_for<Ts...>, Ts...>() {};
template <typename... TTs>
inline constexpr bool operator==(const Tuple<TTs...>& other) const
requires (TypeList<Ts...>{} == TypeList<TTs...>{}) {
return [&]<auto... Is>(std::index_sequence<Is...>){
inline constexpr bool operator==(const Tuple<Ts...>& other) const {
return [&]<std::size_t... Is>(std::index_sequence<Is...>){
return ((Get<Is>(*this) == Get<Is>(other)) && ...);
}(std::index_sequence_for<TTs...>());
}(std::index_sequence_for<Ts...>());
};
template <typename... TTs>
inline constexpr auto operator+(const Tuple<TTs...>& other) const -> Tuple<Ts..., TTs...> {
return [&]<auto... Is, auto... IIs>(std::index_sequence<Is...>, std::index_sequence<IIs...>) -> Tuple<Ts..., TTs...> {
return [&]<std::size_t... Is, std::size_t... IIs>(std::index_sequence<Is...>, std::index_sequence<IIs...>) -> Tuple<Ts..., TTs...> {
return {Get<Is>(*this)..., Get<IIs>(other)...};
}(std::index_sequence_for<Ts...>(), std::index_sequence_for<TTs...>());
};
@ -107,19 +109,6 @@ struct Tuple<> {
return true;
};
};
namespace impl {
template <typename T>
struct Process {
using type = decltype(Overloaded(
[]<typename TT>(TT&&) -> std::remove_cvref_t<TT> {},
[]<std::size_t N>(const char(&)[N]) -> const char* {}
)(std::declval<T>()));
};
} // namespace impl
template <typename... Ts>
Tuple(Ts&&...) -> Tuple<typename impl::Process<Ts>::type...>;

2
include/utempl/type_list.hpp
View file

@ -37,7 +37,7 @@ consteval auto operator+(const TypeList<Ts...>&, const TypeList<TTs...>&) -> Typ
};
template <std::size_t... Is, typename T>
consteval auto Get(std::index_sequence<Is...>, decltype(impl::Caster(Is))..., T, ...) -> T;
consteval auto Get(std::index_sequence<Is...>, decltype(impl::Caster(Is))..., T&& arg, ...) -> T;
template <std::size_t I, typename... Ts>
consteval auto Get(const TypeList<Ts...>&) -> decltype(Get(std::make_index_sequence<I>(), std::declval<Ts>()...)) requires (I < sizeof...(Ts));