626 lines
23 KiB
C++
626 lines
23 KiB
C++
#ifndef ENTT_CORE_ANY_HPP
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#define ENTT_CORE_ANY_HPP
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#include <cstddef>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include "../config/config.h"
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#include "fwd.hpp"
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#include "type_info.hpp"
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#include "type_traits.hpp"
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#include "utility.hpp"
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namespace entt {
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/*! @cond TURN_OFF_DOXYGEN */
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namespace internal {
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enum class any_request : std::uint8_t {
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info,
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transfer,
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assign,
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compare,
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copy,
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move
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};
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template<std::size_t Len, std::size_t Align>
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struct basic_any_storage {
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static constexpr bool has_buffer = true;
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union {
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const void *instance{};
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// NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays, modernize-avoid-c-arrays)
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alignas(Align) std::byte buffer[Len];
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};
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};
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template<std::size_t Align>
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struct basic_any_storage<0u, Align> {
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static constexpr bool has_buffer = false;
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const void *instance{};
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};
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template<typename Type, std::size_t Len, std::size_t Align>
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// NOLINTNEXTLINE(bugprone-sizeof-expression)
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struct in_situ: std::bool_constant<(Len != 0u) && alignof(Type) <= Align && sizeof(Type) <= Len && std::is_nothrow_move_constructible_v<Type>> {};
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template<std::size_t Len, std::size_t Align>
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struct in_situ<void, Len, Align>: std::false_type {};
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} // namespace internal
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/*! @endcond */
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/**
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* @brief A SBO friendly, type-safe container for single values of any type.
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* @tparam Len Size of the buffer reserved for the small buffer optimization.
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* @tparam Align Optional alignment requirement.
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*/
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template<std::size_t Len, std::size_t Align>
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class basic_any: private internal::basic_any_storage<Len, Align> {
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using request = internal::any_request;
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using base_type = internal::basic_any_storage<Len, Align>;
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using vtable_type = const void *(const request, const basic_any &, const void *);
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using deleter_type = void(const basic_any &);
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template<typename Type>
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static constexpr bool in_situ_v = internal::in_situ<Type, Len, Align>::value;
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template<typename Type>
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static const void *basic_vtable(const request req, const basic_any &value, const void *other) {
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static_assert(std::is_same_v<std::remove_const_t<std::remove_reference_t<Type>>, Type>, "Invalid type");
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switch(const auto *elem = static_cast<const Type *>(value.data()); req) {
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case request::info:
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return &type_id<Type>();
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case request::transfer:
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if constexpr(std::is_move_assignable_v<Type>) {
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// NOLINTNEXTLINE(bugprone-casting-through-void)
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*const_cast<Type *>(elem) = std::move(*static_cast<Type *>(const_cast<void *>(other)));
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return other;
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}
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[[fallthrough]];
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case request::assign:
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if constexpr(std::is_copy_assignable_v<Type>) {
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*const_cast<Type *>(elem) = *static_cast<const Type *>(other);
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return other;
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}
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break;
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case request::compare:
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if constexpr(!std::is_function_v<Type> && !std::is_array_v<Type> && is_equality_comparable_v<Type>) {
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return (*elem == *static_cast<const Type *>(other)) ? other : nullptr;
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} else {
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return (elem == other) ? other : nullptr;
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}
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case request::copy:
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if constexpr(std::is_copy_constructible_v<Type>) {
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// NOLINTNEXTLINE(bugprone-casting-through-void)
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static_cast<basic_any *>(const_cast<void *>(other))->initialize<Type>(*elem);
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}
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break;
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case request::move:
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ENTT_ASSERT(value.mode == any_policy::embedded, "Unexpected policy");
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if constexpr(in_situ_v<Type>) {
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// NOLINTNEXTLINE(bugprone-casting-through-void, bugprone-multi-level-implicit-pointer-conversion)
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return ::new(&static_cast<basic_any *>(const_cast<void *>(other))->buffer) Type{std::move(*const_cast<Type *>(elem))};
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}
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}
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return nullptr;
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}
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template<typename Type>
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static void basic_deleter(const basic_any &value) {
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static_assert(std::is_same_v<std::remove_const_t<std::remove_reference_t<Type>>, Type>, "Invalid type");
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ENTT_ASSERT((value.mode == any_policy::dynamic) || ((value.mode == any_policy::embedded) && !std::is_trivially_destructible_v<Type>), "Unexpected policy");
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const auto *elem = static_cast<const Type *>(value.data());
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if constexpr(in_situ_v<Type>) {
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(value.mode == any_policy::embedded) ? elem->~Type() : (delete elem);
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} else if constexpr(std::is_array_v<Type>) {
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delete[] elem;
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} else {
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delete elem;
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}
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}
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template<typename Type, typename... Args>
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void initialize([[maybe_unused]] Args &&...args) {
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using plain_type = std::remove_const_t<std::remove_reference_t<Type>>;
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vtable = basic_vtable<plain_type>;
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underlying_type = type_hash<plain_type>::value();
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if constexpr(std::is_void_v<Type>) {
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deleter = nullptr;
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mode = any_policy::empty;
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this->instance = nullptr;
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} else if constexpr(std::is_lvalue_reference_v<Type>) {
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deleter = nullptr;
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mode = std::is_const_v<std::remove_reference_t<Type>> ? any_policy::cref : any_policy::ref;
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static_assert((std::is_lvalue_reference_v<Args> && ...) && (sizeof...(Args) == 1u), "Invalid arguments");
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// NOLINTNEXTLINE(bugprone-multi-level-implicit-pointer-conversion)
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this->instance = (std::addressof(args), ...);
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} else if constexpr(in_situ_v<plain_type>) {
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if constexpr(std::is_trivially_destructible_v<plain_type>) {
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deleter = nullptr;
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} else {
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deleter = &basic_deleter<plain_type>;
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}
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mode = any_policy::embedded;
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if constexpr(std::is_aggregate_v<plain_type> && (sizeof...(Args) != 0u || !std::is_default_constructible_v<plain_type>)) {
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::new(&this->buffer) plain_type{std::forward<Args>(args)...};
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} else {
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// NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-array-to-pointer-decay)
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::new(&this->buffer) plain_type(std::forward<Args>(args)...);
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}
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} else {
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deleter = &basic_deleter<plain_type>;
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mode = any_policy::dynamic;
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if constexpr(std::is_aggregate_v<plain_type> && (sizeof...(Args) != 0u || !std::is_default_constructible_v<plain_type>)) {
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this->instance = new plain_type{std::forward<Args>(args)...};
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} else if constexpr(std::is_array_v<plain_type>) {
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static_assert(sizeof...(Args) == 0u, "Invalid arguments");
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this->instance = new plain_type[std::extent_v<plain_type>]();
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} else {
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this->instance = new plain_type(std::forward<Args>(args)...);
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}
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}
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}
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void invoke_deleter_if_exists() {
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if(deleter != nullptr) {
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deleter(*this);
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}
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}
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public:
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/*! @brief Size of the internal buffer. */
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static constexpr auto length = Len;
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/*! @brief Alignment requirement. */
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static constexpr auto alignment = Align;
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/*! @brief Default constructor. */
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constexpr basic_any() noexcept
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: basic_any{std::in_place_type<void>} {}
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/**
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* @brief Constructs a wrapper by directly initializing the new object.
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* @tparam Type Type of object to use to initialize the wrapper.
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* @tparam Args Types of arguments to use to construct the new instance.
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* @param args Parameters to use to construct the instance.
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*/
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template<typename Type, typename... Args>
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explicit basic_any(std::in_place_type_t<Type>, Args &&...args)
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: base_type{} {
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initialize<Type>(std::forward<Args>(args)...);
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}
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/**
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* @brief Constructs a wrapper taking ownership of the passed object.
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* @tparam Type Type of object to use to initialize the wrapper.
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* @param value A pointer to an object to take ownership of.
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*/
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template<typename Type>
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explicit basic_any(std::in_place_t, Type *value)
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: base_type{} {
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static_assert(!std::is_const_v<Type> && !std::is_void_v<Type>, "Non-const non-void pointer required");
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if(value == nullptr) {
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initialize<void>();
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} else {
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initialize<Type &>(*value);
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deleter = &basic_deleter<Type>;
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mode = any_policy::dynamic;
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}
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}
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/**
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* @brief Constructs a wrapper from a given value.
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* @tparam Type Type of object to use to initialize the wrapper.
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* @param value An instance of an object to use to initialize the wrapper.
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*/
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template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, basic_any>>>
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basic_any(Type &&value)
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: basic_any{std::in_place_type<std::decay_t<Type>>, std::forward<Type>(value)} {}
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/**
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* @brief Copy constructor.
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* @param other The instance to copy from.
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*/
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basic_any(const basic_any &other)
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: basic_any{} {
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other.vtable(request::copy, other, this);
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}
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/**
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* @brief Move constructor.
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* @param other The instance to move from.
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*/
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basic_any(basic_any &&other) noexcept
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: base_type{},
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vtable{other.vtable},
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underlying_type{other.underlying_type},
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deleter{other.deleter},
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mode{other.mode} {
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if(other.mode == any_policy::embedded) {
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other.vtable(request::move, other, this);
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} else if(other.mode != any_policy::empty) {
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this->instance = std::exchange(other.instance, nullptr);
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}
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}
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/*! @brief Frees the internal buffer, whatever it means. */
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~basic_any() {
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invoke_deleter_if_exists();
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}
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/**
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* @brief Copy assignment operator.
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* @param other The instance to copy from.
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* @return This any object.
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*/
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basic_any &operator=(const basic_any &other) {
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if(this != &other) {
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invoke_deleter_if_exists();
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if(other) {
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other.vtable(request::copy, other, this);
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} else {
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initialize<void>();
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}
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}
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return *this;
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}
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/**
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* @brief Move assignment operator.
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* @param other The instance to move from.
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* @return This any object.
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*/
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basic_any &operator=(basic_any &&other) noexcept {
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if(this != &other) {
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invoke_deleter_if_exists();
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if(other.mode == any_policy::embedded) {
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other.vtable(request::move, other, this);
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} else if(other.mode != any_policy::empty) {
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this->instance = std::exchange(other.instance, nullptr);
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}
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vtable = other.vtable;
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underlying_type = other.underlying_type;
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deleter = other.deleter;
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mode = other.mode;
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}
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return *this;
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}
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/**
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* @brief Value assignment operator.
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* @tparam Type Type of object to use to initialize the wrapper.
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* @param value An instance of an object to use to initialize the wrapper.
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* @return This any object.
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*/
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template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, basic_any>>>
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basic_any &operator=(Type &&value) {
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emplace<std::decay_t<Type>>(std::forward<Type>(value));
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return *this;
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}
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/**
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* @brief Returns false if a wrapper is empty, true otherwise.
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* @return False if the wrapper is empty, true otherwise.
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*/
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[[nodiscard]] bool has_value() const noexcept {
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return (mode != any_policy::empty);
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}
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/**
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* @brief Returns false if the wrapper does not contain the expected type,
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* true otherwise.
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* @param req Expected type.
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* @return False if the wrapper does not contain the expected type, true
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* otherwise.
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*/
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[[nodiscard]] bool has_value(const type_info &req) const noexcept {
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return (underlying_type == req.hash());
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}
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/**
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* @brief Returns false if the wrapper does not contain the expected type,
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* true otherwise.
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* @tparam Type Expected type.
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* @return False if the wrapper does not contain the expected type, true
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* otherwise.
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*/
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template<typename Type>
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[[nodiscard]] bool has_value() const noexcept {
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static_assert(std::is_same_v<std::remove_const_t<Type>, Type>, "Invalid type");
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return (underlying_type == type_hash<Type>::value());
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}
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/**
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* @brief Returns the object type info if any, `type_id<void>()` otherwise.
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* @return The object type info if any, `type_id<void>()` otherwise.
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*/
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[[nodiscard]] const type_info &info() const noexcept {
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return *static_cast<const type_info *>(vtable(request::info, *this, nullptr));
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}
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/*! @copydoc info */
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[[deprecated("use ::info instead")]] [[nodiscard]] const type_info &type() const noexcept {
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return info();
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}
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/**
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* @brief Returns an opaque pointer to the contained instance.
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* @return An opaque pointer the contained instance, if any.
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*/
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[[nodiscard]] const void *data() const noexcept {
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if constexpr(base_type::has_buffer) {
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return (mode == any_policy::embedded) ? &this->buffer : this->instance;
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} else {
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return this->instance;
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}
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}
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/**
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* @brief Returns an opaque pointer to the contained instance.
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* @param req Expected type.
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* @return An opaque pointer the contained instance, if any.
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*/
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[[nodiscard]] const void *data(const type_info &req) const noexcept {
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return has_value(req) ? data() : nullptr;
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}
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/**
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* @brief Returns an opaque pointer to the contained instance.
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* @tparam Type Expected type.
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* @return An opaque pointer the contained instance, if any.
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*/
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template<typename Type>
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[[nodiscard]] const Type *data() const noexcept {
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return has_value<std::remove_const_t<Type>>() ? static_cast<const Type *>(data()) : nullptr;
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}
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/**
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* @brief Returns an opaque pointer to the contained instance.
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* @return An opaque pointer the contained instance, if any.
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*/
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[[nodiscard]] void *data() noexcept {
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return (mode == any_policy::cref) ? nullptr : const_cast<void *>(std::as_const(*this).data());
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}
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/**
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* @brief Returns an opaque pointer to the contained instance.
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* @param req Expected type.
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* @return An opaque pointer the contained instance, if any.
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*/
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[[nodiscard]] void *data(const type_info &req) noexcept {
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return (mode == any_policy::cref) ? nullptr : const_cast<void *>(std::as_const(*this).data(req));
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}
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/**
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* @brief Returns an opaque pointer to the contained instance.
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* @tparam Type Expected type.
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* @return An opaque pointer the contained instance, if any.
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*/
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template<typename Type>
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[[nodiscard]] Type *data() noexcept {
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if constexpr(std::is_const_v<Type>) {
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return std::as_const(*this).template data<std::remove_const_t<Type>>();
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} else {
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return (mode == any_policy::cref) ? nullptr : const_cast<Type *>(std::as_const(*this).template data<std::remove_const_t<Type>>());
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}
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}
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/**
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* @brief Replaces the contained object by creating a new instance directly.
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* @tparam Type Type of object to use to initialize the wrapper.
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* @tparam Args Types of arguments to use to construct the new instance.
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* @param args Parameters to use to construct the instance.
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*/
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template<typename Type, typename... Args>
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void emplace(Args &&...args) {
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invoke_deleter_if_exists();
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initialize<Type>(std::forward<Args>(args)...);
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}
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/**
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* @brief Assigns a value to the contained object without replacing it.
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* @param other The value to assign to the contained object.
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* @return True in case of success, false otherwise.
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*/
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bool assign(const basic_any &other) {
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if(other && (mode != any_policy::cref) && (underlying_type == other.underlying_type)) {
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return (vtable(request::assign, *this, other.data()) != nullptr);
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}
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return false;
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}
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/*! @copydoc assign */
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// NOLINTNEXTLINE(cppcoreguidelines-rvalue-reference-param-not-moved)
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bool assign(basic_any &&other) {
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if(other && (mode != any_policy::cref) && (underlying_type == other.underlying_type)) {
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return (other.mode == any_policy::cref) ? (vtable(request::assign, *this, std::as_const(other).data()) != nullptr) : (vtable(request::transfer, *this, other.data()) != nullptr);
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}
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return false;
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}
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/*! @brief Destroys contained object */
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void reset() {
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invoke_deleter_if_exists();
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initialize<void>();
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}
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/**
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* @brief Returns false if a wrapper is empty, true otherwise.
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* @return False if the wrapper is empty, true otherwise.
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*/
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[[nodiscard]] explicit operator bool() const noexcept {
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return has_value();
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}
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/**
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* @brief Checks if two wrappers differ in their content.
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* @param other Wrapper with which to compare.
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* @return False if the two objects differ in their content, true otherwise.
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*/
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[[nodiscard]] bool operator==(const basic_any &other) const noexcept {
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if(other && (underlying_type == other.underlying_type)) {
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return (vtable(request::compare, *this, other.data()) != nullptr);
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}
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return (!*this && !other);
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}
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/**
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* @brief Checks if two wrappers differ in their content.
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* @param other Wrapper with which to compare.
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* @return True if the two objects differ in their content, false otherwise.
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*/
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|
[[nodiscard]] bool operator!=(const basic_any &other) const noexcept {
|
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return !(*this == other);
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|
}
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|
|
|
/**
|
|
* @brief Aliasing constructor.
|
|
* @return A wrapper that shares a reference to an unmanaged object.
|
|
*/
|
|
[[nodiscard]] basic_any as_ref() noexcept {
|
|
basic_any other = std::as_const(*this).as_ref();
|
|
other.mode = (mode == any_policy::cref ? any_policy::cref : any_policy::ref);
|
|
return other;
|
|
}
|
|
|
|
/*! @copydoc as_ref */
|
|
[[nodiscard]] basic_any as_ref() const noexcept {
|
|
basic_any other{};
|
|
other.instance = data();
|
|
other.vtable = vtable;
|
|
other.underlying_type = underlying_type;
|
|
other.mode = any_policy::cref;
|
|
return other;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns true if a wrapper owns its object, false otherwise.
|
|
* @return True if the wrapper owns its object, false otherwise.
|
|
*/
|
|
[[nodiscard]] bool owner() const noexcept {
|
|
return (mode == any_policy::dynamic || mode == any_policy::embedded);
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the current mode of an any object.
|
|
* @return The current mode of the any object.
|
|
*/
|
|
[[nodiscard]] any_policy policy() const noexcept {
|
|
return mode;
|
|
}
|
|
|
|
private:
|
|
vtable_type *vtable{};
|
|
deleter_type *deleter{};
|
|
id_type underlying_type{};
|
|
any_policy mode{};
|
|
};
|
|
|
|
/**
|
|
* @brief Performs type-safe access to the contained object.
|
|
* @tparam Type Type to which conversion is required.
|
|
* @tparam Len Size of the buffer reserved for the small buffer optimization.
|
|
* @tparam Align Alignment requirement.
|
|
* @param data Target any object.
|
|
* @return The element converted to the requested type.
|
|
*/
|
|
template<typename Type, std::size_t Len, std::size_t Align>
|
|
[[nodiscard]] std::remove_const_t<Type> any_cast(const basic_any<Len, Align> &data) noexcept {
|
|
const auto *const instance = any_cast<std::remove_reference_t<Type>>(&data);
|
|
ENTT_ASSERT(instance, "Invalid instance");
|
|
return static_cast<Type>(*instance);
|
|
}
|
|
|
|
/*! @copydoc any_cast */
|
|
template<typename Type, std::size_t Len, std::size_t Align>
|
|
[[nodiscard]] std::remove_const_t<Type> any_cast(basic_any<Len, Align> &data) noexcept {
|
|
// forces const on non-reference types to make them work also with wrappers for const references
|
|
auto *const instance = any_cast<std::remove_reference_t<const Type>>(&data);
|
|
ENTT_ASSERT(instance, "Invalid instance");
|
|
return static_cast<Type>(*instance);
|
|
}
|
|
|
|
/*! @copydoc any_cast */
|
|
template<typename Type, std::size_t Len, std::size_t Align>
|
|
// NOLINTNEXTLINE(cppcoreguidelines-rvalue-reference-param-not-moved)
|
|
[[nodiscard]] std::remove_const_t<Type> any_cast(basic_any<Len, Align> &&data) noexcept {
|
|
if constexpr(std::is_copy_constructible_v<std::remove_const_t<std::remove_reference_t<Type>>>) {
|
|
if(auto *const instance = any_cast<std::remove_reference_t<Type>>(&data); instance) {
|
|
return static_cast<Type>(std::move(*instance));
|
|
}
|
|
|
|
return any_cast<Type>(data);
|
|
} else {
|
|
auto *const instance = any_cast<std::remove_reference_t<Type>>(&data);
|
|
ENTT_ASSERT(instance, "Invalid instance");
|
|
return static_cast<Type>(std::move(*instance));
|
|
}
|
|
}
|
|
|
|
/*! @copydoc any_cast */
|
|
template<typename Type, std::size_t Len, std::size_t Align>
|
|
[[nodiscard]] const Type *any_cast(const basic_any<Len, Align> *data) noexcept {
|
|
return data->template data<std::remove_const_t<Type>>();
|
|
}
|
|
|
|
/*! @copydoc any_cast */
|
|
template<typename Type, std::size_t Len, std::size_t Align>
|
|
[[nodiscard]] Type *any_cast(basic_any<Len, Align> *data) noexcept {
|
|
if constexpr(std::is_const_v<Type>) {
|
|
// last attempt to make wrappers for const references return their values
|
|
return any_cast<Type>(&std::as_const(*data));
|
|
} else {
|
|
return data->template data<Type>();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Constructs a wrapper from a given type, passing it all arguments.
|
|
* @tparam Type Type of object to use to initialize the wrapper.
|
|
* @tparam Len Size of the buffer reserved for the small buffer optimization.
|
|
* @tparam Align Optional alignment requirement.
|
|
* @tparam Args Types of arguments to use to construct the new instance.
|
|
* @param args Parameters to use to construct the instance.
|
|
* @return A properly initialized wrapper for an object of the given type.
|
|
*/
|
|
template<typename Type, std::size_t Len = basic_any<>::length, std::size_t Align = basic_any<Len>::alignment, typename... Args>
|
|
[[nodiscard]] basic_any<Len, Align> make_any(Args &&...args) {
|
|
return basic_any<Len, Align>{std::in_place_type<Type>, std::forward<Args>(args)...};
|
|
}
|
|
|
|
/**
|
|
* @brief Forwards its argument and avoids copies for lvalue references.
|
|
* @tparam Len Size of the buffer reserved for the small buffer optimization.
|
|
* @tparam Align Optional alignment requirement.
|
|
* @tparam Type Type of argument to use to construct the new instance.
|
|
* @param value Parameter to use to construct the instance.
|
|
* @return A properly initialized and not necessarily owning wrapper.
|
|
*/
|
|
template<std::size_t Len = basic_any<>::length, std::size_t Align = basic_any<Len>::alignment, typename Type>
|
|
[[nodiscard]] basic_any<Len, Align> forward_as_any(Type &&value) {
|
|
return basic_any<Len, Align>{std::in_place_type<Type &&>, std::forward<Type>(value)};
|
|
}
|
|
|
|
} // namespace entt
|
|
|
|
#endif
|