102 lines
4.5 KiB
C++
102 lines
4.5 KiB
C++
#pragma once
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#include "accessor.hpp"
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#include "attributes.hpp"
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#include "meta.hpp"
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#include <cstddef>
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#include <tuple>
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#include <string_view>
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#include <type_traits>
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#include <utility>
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namespace structive {
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template <class Value, class... Attributes>
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consteval bool constraints_compatible() {
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return (([] {
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if constexpr (Property_Constraint<Attributes>) {
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return Property_Constraint_For<Attributes, Value>;
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}
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return true;
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}()) && ...);
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}
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template <Property_Accessor Accessor, class... Attributes>
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struct Property_Descriptor {
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using property_descriptor_tag = void;
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using accessor_type = Accessor;
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using object_type = typename Accessor::object_type;
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using value_type = typename Accessor::value_type;
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using storage_identity = typename Accessor::storage_identity;
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using attribute_types = Type_List<Attributes...>;
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static constexpr bool readable = Accessor::readable;
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static constexpr bool writable = Accessor::writable;
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static constexpr bool synchronized_view_read = Accessor::synchronized_view_read;
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static constexpr bool trusted_object_access = Accessor::trusted_object_access;
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static_assert(unique_single_value_categories<Attributes...>());
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using key_type = find_attribute_in_list_t<Key_Category, attribute_types>;
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static_assert(!std::same_as<key_type, void>);
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static_assert(key_type::value.view().size() > 0);
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static_assert(constraints_compatible<value_type, Attributes...>());
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[[no_unique_address]] Accessor accessor{};
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std::tuple<Attributes...> attributes;
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template <class Category>
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using attribute_type = find_attribute_in_list_t<Category, attribute_types>;
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template <class Category>
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static constexpr bool has_attribute = !std::same_as<attribute_type<Category>, void>;
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template <class Category>
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constexpr decltype(auto) attribute() const requires has_attribute<Category> {
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using target = attribute_type<Category>;
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return std::get<target>(attributes);
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}
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constexpr std::string_view key() const noexcept {
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return key_type::value.view();
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}
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template <class Function>
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constexpr void for_each_attribute(Function&& function) const {
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std::apply([&](const auto&... values) {
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(function(values), ...);
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}, attributes);
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}
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template <class Function>
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constexpr void for_each_constraint(Function&& function) const {
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std::apply([&](const auto&... values) {
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([&] {
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using type = std::remove_cvref_t<decltype(values)>;
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if constexpr (Property_Constraint<type>) {
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function(values);
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}
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}(), ...);
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}, attributes);
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}
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};
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template <class Type>
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concept Property_Descriptor_Type = requires {
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typename Type::property_descriptor_tag;
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typename Type::object_type;
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typename Type::value_type;
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typename Type::accessor_type;
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typename Type::storage_identity;
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};
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template <auto Member, class... Attributes>
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constexpr auto property(Attributes&&... attributes) {
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using accessor = Member_Accessor<Member>;
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return Property_Descriptor<accessor, std::decay_t<Attributes>...>{{}, {std::forward<Attributes>(attributes)...}};
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}
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template <auto Member, class... Attributes>
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constexpr auto field(Attributes&&... attributes) {
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return property<Member>(std::forward<Attributes>(attributes)...);
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}
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template <class Object, class Value, class Function, class... Attributes>
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constexpr auto computed_property(Function&& function, Attributes&&... attributes) {
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using accessor = Synchronized_Computed_Accessor<Object, Value, std::decay_t<Function>>;
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return Property_Descriptor<accessor, std::decay_t<Attributes>...>{accessor{std::forward<Function>(function)}, {std::forward<Attributes>(attributes)...}};
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}
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template <auto Getter, class... Attributes> requires Trusted_Getter_Function<Getter>
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constexpr auto trusted_computed_property(Attributes&&... attributes) {
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using accessor = Trusted_Computed_Accessor<Getter>;
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return Property_Descriptor<accessor, std::decay_t<Attributes>...>{{}, {std::forward<Attributes>(attributes)...}};
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}
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template <auto Getter, auto Setter, class... Attributes> requires Trusted_Getter_Function<Getter> && Trusted_Setter_Function_For<Setter, trusted_getter_object_t<Getter>, trusted_getter_value_t<Getter>>
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constexpr auto trusted_accessor_property(Attributes&&... attributes) {
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using accessor = Trusted_Getter_Setter_Accessor<Getter, Setter>;
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return Property_Descriptor<accessor, std::decay_t<Attributes>...>{{}, {std::forward<Attributes>(attributes)...}};
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}
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}
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