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meta: refine meta_any vtable, prepare to drop any from meta container rebind

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This commit is contained in:
Michele Caini
2023-08-03 10:11:57 +02:00
parent f65a21f88c
commit ace3da4173
1 changed files with 18 additions and 18 deletions
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36
src/entt/meta/meta.hpp
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@@ -151,13 +151,15 @@ class meta_any {
enum class operation : std::uint8_t {
deref,
seq,
assoc
cseq,
assoc,
cassoc
};
using vtable_type = void(const operation, const any &, void *);
using vtable_type = void(const operation, const void *, void *);
template<typename Type>
static void basic_vtable([[maybe_unused]] const operation op, [[maybe_unused]] const any &value, [[maybe_unused]] void *other) {
static void basic_vtable([[maybe_unused]] const operation op, [[maybe_unused]] const void *value, [[maybe_unused]] void *other) {
static_assert(std::is_same_v<std::remove_cv_t<std::remove_reference_t<Type>>, Type>, "Invalid type");
if constexpr(!std::is_void_v<Type>) {
@@ -165,28 +167,30 @@ class meta_any {
case operation::deref:
if constexpr(is_meta_pointer_like_v<Type>) {
if constexpr(std::is_function_v<typename std::pointer_traits<Type>::element_type>) {
static_cast<meta_any *>(other)->emplace<Type>(any_cast<Type>(value));
static_cast<meta_any *>(other)->emplace<Type>(*static_cast<const Type *>(value));
} else if constexpr(!std::is_same_v<std::remove_const_t<typename std::pointer_traits<Type>::element_type>, void>) {
using in_place_type = decltype(adl_meta_pointer_like<Type>::dereference(any_cast<const Type &>(value)));
using in_place_type = decltype(adl_meta_pointer_like<Type>::dereference(*static_cast<const Type *>(value)));
if constexpr(std::is_constructible_v<bool, Type>) {
if(const auto &pointer_like = any_cast<const Type &>(value); pointer_like) {
if(const auto &pointer_like = *static_cast<const Type *>(value); pointer_like) {
static_cast<meta_any *>(other)->emplace<in_place_type>(adl_meta_pointer_like<Type>::dereference(pointer_like));
}
} else {
static_cast<meta_any *>(other)->emplace<in_place_type>(adl_meta_pointer_like<Type>::dereference(any_cast<const Type &>(value)));
static_cast<meta_any *>(other)->emplace<in_place_type>(adl_meta_pointer_like<Type>::dereference(*static_cast<const Type *>(value)));
}
}
}
break;
case operation::seq:
case operation::cseq:
if constexpr(is_complete_v<meta_sequence_container_traits<Type>>) {
static_cast<meta_sequence_container *>(other)->rebind<Type>(std::move(const_cast<any &>(value)));
op == operation::seq ? static_cast<meta_sequence_container *>(other)->rebind<Type>(forward_as_any(*static_cast<Type *>(const_cast<void *>(value)))) : static_cast<meta_sequence_container *>(other)->rebind<Type>(forward_as_any(*static_cast<const Type *>(value)));
}
break;
case operation::assoc:
case operation::cassoc:
if constexpr(is_complete_v<meta_associative_container_traits<Type>>) {
static_cast<meta_associative_container *>(other)->rebind<Type>(std::move(const_cast<any &>(value)));
op == operation::assoc ? static_cast<meta_associative_container *>(other)->rebind<Type>(forward_as_any(*static_cast<Type *>(const_cast<void *>(value)))) : static_cast<meta_associative_container *>(other)->rebind<Type>(forward_as_any(*static_cast<const Type *>(value)));
}
break;
}
@@ -517,17 +521,15 @@ public:
* @return A sequence container proxy for the underlying object.
*/
[[nodiscard]] meta_sequence_container as_sequence_container() noexcept {
any detached = storage.as_ref();
meta_sequence_container proxy{*ctx};
vtable(operation::seq, detached, &proxy);
vtable(policy() == meta_any_policy::cref ? operation::cseq : operation::seq, std::as_const(*this).data(), &proxy);
return proxy;
}
/*! @copydoc as_sequence_container */
[[nodiscard]] meta_sequence_container as_sequence_container() const noexcept {
any detached = storage.as_ref();
meta_sequence_container proxy{*ctx};
vtable(operation::seq, detached, &proxy);
vtable(operation::cseq, data(), &proxy);
return proxy;
}
@@ -536,17 +538,15 @@ public:
* @return An associative container proxy for the underlying object.
*/
[[nodiscard]] meta_associative_container as_associative_container() noexcept {
any detached = storage.as_ref();
meta_associative_container proxy{*ctx};
vtable(operation::assoc, detached, &proxy);
vtable(policy() == meta_any_policy::cref ? operation::cassoc : operation::assoc, std::as_const(*this).data(), &proxy);
return proxy;
}
/*! @copydoc as_associative_container */
[[nodiscard]] meta_associative_container as_associative_container() const noexcept {
any detached = storage.as_ref();
meta_associative_container proxy{*ctx};
vtable(operation::assoc, detached, &proxy);
vtable(operation::cassoc, data(), &proxy);
return proxy;
}
@@ -557,7 +557,7 @@ public:
*/
[[nodiscard]] meta_any operator*() const noexcept {
meta_any ret{meta_ctx_arg, *ctx};
vtable(operation::deref, storage, &ret);
vtable(operation::deref, storage.data(), &ret);
return ret;
}