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meta: fake vtable for meta associative containers

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This commit is contained in:
skypjack
2023-07-18 09:33:50 +02:00
committed by Michele Caini
parent 44f30dc01c
commit 5ff2b97f67
2 changed files with 86 additions and 70 deletions
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98
src/entt/meta/container.hpp
View File

@@ -118,62 +118,68 @@ template<typename Type>
struct basic_meta_associative_container_traits {
static_assert(std::is_same_v<Type, std::remove_cv_t<std::remove_reference_t<Type>>>, "Unexpected type");
using operation = internal::meta_associative_container_operation;
using size_type = typename meta_associative_container::size_type;
using iterator = typename meta_associative_container::iterator;
static constexpr auto key_only = key_only_associative_container<Type>::value;
[[nodiscard]] static size_type size(const void *container) noexcept {
return static_cast<const Type *>(container)->size();
}
[[nodiscard]] static bool clear(void *container) {
static_cast<Type *>(container)->clear();
return true;
}
[[nodiscard]] static bool reserve([[maybe_unused]] void *container, [[maybe_unused]] const size_type sz) {
if constexpr(reserve_aware_container<Type>::value) {
static_cast<Type *>(container)->reserve(sz);
static size_type basic_vtable(const operation op, const meta_ctx &ctx, const void *container, meta_any *key, const void *value, iterator *it) {
switch(const Type *cont = static_cast<const Type *>(container); op) {
case operation::size:
return cont->size();
case operation::clear:
const_cast<Type *>(cont)->clear();
return true;
} else {
return false;
}
}
[[nodiscard]] static iterator iter(const meta_ctx &ctx, const void *container, const bool as_const, const bool as_end) {
if(as_const) {
const auto it = as_end ? static_cast<const Type *>(container)->end() : static_cast<const Type *>(container)->begin();
return iterator{ctx, std::bool_constant<key_only>{}, it};
} else {
const auto it = as_end ? static_cast<Type *>(const_cast<void *>(container))->end() : static_cast<Type *>(const_cast<void *>(container))->begin();
return iterator{ctx, std::bool_constant<key_only>{}, it};
}
}
[[nodiscard]] static size_type insert_or_erase(void *container, meta_any &key, meta_any &value) {
if(auto *const cont = static_cast<Type *>(container); key.allow_cast<const typename Type::key_type &>()) {
if(value) {
if constexpr(key_only) {
return cont->insert(key.cast<const typename Type::key_type &>()).second;
} else {
return value.allow_cast<const typename Type::mapped_type &>() && cont->emplace(key.cast<const typename Type::key_type &>(), value.cast<const typename Type::mapped_type &>()).second;
}
case operation::reserve:
if constexpr(reserve_aware_container<Type>::value) {
const_cast<Type *>(cont)->reserve(*static_cast<const size_type *>(value));
return true;
} else {
return cont->erase(key.cast<const typename Type::key_type &>());
break;
}
case operation::begin:
*it = iterator{ctx, std::bool_constant<key_only>{}, const_cast<Type *>(cont)->begin()};
return true;
case operation::end:
*it = iterator{ctx, std::bool_constant<key_only>{}, const_cast<Type *>(cont)->end()};
return true;
case operation::cbegin:
*it = iterator{ctx, std::bool_constant<key_only>{}, cont->begin()};
return true;
case operation::cend:
*it = iterator{ctx, std::bool_constant<key_only>{}, cont->end()};
return true;
case operation::insert:
if(key->allow_cast<const typename Type::key_type &>()) {
if constexpr(key_only) {
return const_cast<Type *>(cont)->insert(key->cast<const typename Type::key_type &>()).second;
} else {
meta_any *val = static_cast<meta_any *>(const_cast<void *>(value));
return val->allow_cast<const typename Type::mapped_type &>() && const_cast<Type *>(cont)->emplace(key->cast<const typename Type::key_type &>(), val->cast<const typename Type::mapped_type &>()).second;
}
}
break;
case operation::erase:
if(key->allow_cast<const typename Type::key_type &>()) {
return const_cast<Type *>(cont)->erase(key->cast<const typename Type::key_type &>());
}
break;
case operation::find:
if(key->allow_cast<const typename Type::key_type &>()) {
*it = iterator{ctx, std::bool_constant<key_only>{}, const_cast<Type *>(cont)->find(key->cast<const typename Type::key_type &>())};
return true;
}
break;
case operation::cfind:
if(key->allow_cast<const typename Type::key_type &>()) {
*it = iterator{ctx, std::bool_constant<key_only>{}, cont->find(key->cast<const typename Type::key_type &>())};
return true;
}
break;
}
return 0u;
}
[[nodiscard]] static iterator find(const meta_ctx &ctx, const void *container, const bool as_const, meta_any &key) {
if(key.allow_cast<const typename Type::key_type &>()) {
return as_const ? iterator{ctx, std::bool_constant<key_only>{}, static_cast<const Type *>(container)->find(key.cast<const typename Type::key_type &>())}
: iterator{ctx, std::bool_constant<key_only>{}, static_cast<Type *>(const_cast<void *>(container))->find(key.cast<const typename Type::key_type &>())};
}
return iterator{};
return false;
}
};

58
src/entt/meta/meta.hpp
View File

@@ -46,6 +46,20 @@ enum class meta_sequence_container_operation {
erase
};
enum class meta_associative_container_operation {
size,
clear,
reserve,
begin,
end,
cbegin,
cend,
insert,
erase,
find,
cfind
};
} // namespace internal
/**
@@ -106,6 +120,7 @@ private:
/*! @brief Proxy object for associative containers. */
class meta_associative_container {
class meta_iterator;
using operation = internal::meta_associative_container_operation;
public:
/*! @brief Unsigned integer type. */
@@ -128,20 +143,15 @@ public:
template<typename Type>
void rebind(any instance) noexcept {
ENTT_ASSERT(instance.type() == type_id<Type>(), "Unexpected type");
key_type_node = &internal::resolve<typename Type::key_type>;
value_type_node = &internal::resolve<typename Type::value_type>;
if constexpr(!meta_associative_container_traits<Type>::key_only) {
mapped_type_node = &internal::resolve<typename Type::mapped_type>;
}
key_only_container = meta_associative_container_traits<Type>::key_only;
key_type_node = &internal::resolve<typename Type::key_type>;
value_type_node = &internal::resolve<typename Type::value_type>;
size_fn = &meta_associative_container_traits<Type>::size;
clear_fn = &meta_associative_container_traits<Type>::clear;
reserve_fn = &meta_associative_container_traits<Type>::reserve;
iter_fn = &meta_associative_container_traits<Type>::iter;
insert_or_erase_fn = &meta_associative_container_traits<Type>::insert_or_erase;
find_fn = &meta_associative_container_traits<Type>::find;
vtable = meta_associative_container_traits<Type>::basic_vtable;
storage = std::move(instance);
}
@@ -166,12 +176,7 @@ private:
internal::meta_type_node (*key_type_node)(const internal::meta_context &){};
internal::meta_type_node (*mapped_type_node)(const internal::meta_context &){};
internal::meta_type_node (*value_type_node)(const internal::meta_context &){};
size_type (*size_fn)(const void *) noexcept {};
bool (*clear_fn)(void *){};
bool (*reserve_fn)(void *, const size_type){};
iterator (*iter_fn)(const meta_ctx &, const void *, const bool, const bool){};
size_type (*insert_or_erase_fn)(void *, meta_any &, meta_any &){};
iterator (*find_fn)(const meta_ctx &, const void *, const bool, meta_any &){};
size_type (*vtable)(const operation, const meta_ctx &, const void *, meta_any *, const void *, iterator *){};
any storage{};
};
@@ -1986,27 +1991,31 @@ inline meta_sequence_container::iterator meta_sequence_container::erase(iterator
/*! @copydoc meta_sequence_container::size */
[[nodiscard]] inline meta_associative_container::size_type meta_associative_container::size() const noexcept {
return size_fn(storage.data());
return vtable(operation::size, *ctx, std::as_const(storage).data(), nullptr, nullptr, nullptr);
}
/*! @copydoc meta_sequence_container::clear */
inline bool meta_associative_container::clear() {
return (storage.policy() != any_policy::cref) && clear_fn(storage.data());
return (storage.policy() != any_policy::cref) && vtable(operation::clear, *ctx, storage.data(), nullptr, nullptr, nullptr);
}
/*! @copydoc meta_sequence_container::reserve */
inline bool meta_associative_container::reserve(const size_type sz) {
return (storage.policy() != any_policy::cref) && reserve_fn(storage.data(), sz);
return (storage.policy() != any_policy::cref) && vtable(operation::reserve, *ctx, storage.data(), nullptr, &sz, nullptr);
}
/*! @copydoc meta_sequence_container::begin */
[[nodiscard]] inline meta_associative_container::iterator meta_associative_container::begin() {
return iter_fn(*ctx, std::as_const(storage).data(), (storage.policy() == any_policy::cref), false);
iterator it{};
vtable(storage.policy() == any_policy::cref ? operation::cbegin : operation::begin, *ctx, std::as_const(storage).data(), nullptr, nullptr, &it);
return it;
}
/*! @copydoc meta_sequence_container::end */
[[nodiscard]] inline meta_associative_container::iterator meta_associative_container::end() {
return iter_fn(*ctx, std::as_const(storage).data(), (storage.policy() == any_policy::cref), true);
iterator it{};
vtable(storage.policy() == any_policy::cref ? operation::cend : operation::end, *ctx, std::as_const(storage).data(), nullptr, nullptr, &it);
return it;
}
/**
@@ -2015,8 +2024,7 @@ inline bool meta_associative_container::reserve(const size_type sz) {
* @return A bool denoting whether the insertion took place.
*/
inline bool meta_associative_container::insert(meta_any key) {
meta_any value{*ctx, std::in_place_type<void>};
return (storage.policy() != any_policy::cref) && (insert_or_erase_fn(storage.data(), key, value) != 0u);
return ((storage.policy() != any_policy::cref) && vtable(operation::insert, *ctx, storage.data(), &key, nullptr, nullptr));
}
/**
@@ -2026,7 +2034,7 @@ inline bool meta_associative_container::insert(meta_any key) {
* @return A bool denoting whether the insertion took place.
*/
inline bool meta_associative_container::insert(meta_any key, meta_any value) {
return (storage.policy() != any_policy::cref) && (insert_or_erase_fn(storage.data(), key, value) != 0u);
return ((storage.policy() != any_policy::cref) && vtable(operation::insert, *ctx, storage.data(), &key, &value, nullptr));
}
/**
@@ -2035,7 +2043,7 @@ inline bool meta_associative_container::insert(meta_any key, meta_any value) {
* @return A bool denoting whether the removal took place.
*/
inline meta_associative_container::size_type meta_associative_container::erase(meta_any key) {
return insert(std::move(key), meta_any{meta_ctx_arg, *ctx});
return ((storage.policy() != any_policy::cref) && vtable(operation::erase, *ctx, storage.data(), &key, nullptr, nullptr));
}
/**
@@ -2044,7 +2052,9 @@ inline meta_associative_container::size_type meta_associative_container::erase(m
* @return An iterator to the element with the given key, if any.
*/
[[nodiscard]] inline meta_associative_container::iterator meta_associative_container::find(meta_any key) {
return find_fn(*ctx, std::as_const(storage).data(), (storage.policy() == any_policy::cref), key);
iterator it{};
vtable(storage.policy() == any_policy::cref ? operation::cfind : operation::find, *ctx, std::as_const(storage).data(), &key, nullptr, &it);
return it;
}
/**