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meta: meta_any::allow_cast overload for meta types

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This commit is contained in:
Michele Caini
2021-07-22 16:55:45 +02:00
parent c30dfe3bfe
commit 18373bb679
1 changed files with 52 additions and 30 deletions
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82
src/entt/meta/meta.hpp
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@@ -61,13 +61,13 @@ public:
[[nodiscard]] inline meta_type value_type() const ENTT_NOEXCEPT;
[[nodiscard]] inline size_type size() const ENTT_NOEXCEPT;
inline bool resize(size_type);
inline bool resize(const size_type);
inline bool clear();
[[nodiscard]] inline iterator begin();
[[nodiscard]] inline iterator end();
inline iterator insert(iterator, meta_any);
inline iterator erase(iterator);
[[nodiscard]] inline meta_any operator[](size_type);
[[nodiscard]] inline meta_any operator[](const size_type);
[[nodiscard]] inline explicit operator bool() const ENTT_NOEXCEPT;
private:
@@ -430,6 +430,21 @@ public:
return static_cast<Type>(*instance);
}
/**
* @brief Converts an object in such a way that a given cast becomes viable.
* @param type Meta type to which the cast is requested.
* @return A valid meta any object if there exists a viable conversion, an
* invalid one otherwise.
*/
[[nodiscard]] meta_any allow_cast(const meta_type &type) const;
/**
* @brief Converts an object in such a way that a given cast becomes viable.
* @param type Meta type to which the cast is requested.
* @return True if there exists a viable conversion, false otherwise.
*/
[[nodiscard]] bool allow_cast(const meta_type &type);
/**
* @brief Converts an object in such a way that a given cast becomes viable.
* @tparam Type Type to which the cast is requested.
@@ -438,15 +453,7 @@ public:
*/
template<typename Type>
[[nodiscard]] meta_any allow_cast() const {
if(try_cast<std::remove_reference_t<Type>>() != nullptr) {
return as_ref();
} else if(node) {
if(const auto * const conv = visit<&internal::meta_type_node::conv>(type_id<Type>(), node); conv) {
return conv->conv(storage.data());
}
}
return {};
return allow_cast(internal::meta_info<Type>::resolve());
}
/**
@@ -456,17 +463,7 @@ public:
*/
template<typename Type>
bool allow_cast() {
// forces const on non-reference types to make them work also with wrappers for const references
if(try_cast<std::remove_reference_t<const Type>>() != nullptr) {
return true;
} else if(node) {
if(const auto * const conv = visit<&internal::meta_type_node::conv>(type_id<Type>(), node); conv) {
*this = conv->conv(std::as_const(storage).data());
return true;
}
}
return false;
return allow_cast(internal::meta_info<Type>::resolve());
}
/**
@@ -752,7 +749,7 @@ struct meta_ctor {
* @param index Index of the argument of which to return the type.
* @return The type of the i-th argument of a constructor.
*/
[[nodiscard]] meta_type arg(size_type index) const ENTT_NOEXCEPT;
[[nodiscard]] meta_type arg(const size_type index) const ENTT_NOEXCEPT;
/**
* @brief Creates an instance of the underlying type, if possible.
@@ -976,7 +973,7 @@ struct meta_func {
* @param index Index of the argument of which to return the type.
* @return The type of the i-th argument of a member function.
*/
[[nodiscard]] inline meta_type arg(size_type index) const ENTT_NOEXCEPT;
[[nodiscard]] inline meta_type arg(const size_type index) const ENTT_NOEXCEPT;
/**
* @brief Invokes the underlying function, if possible.
@@ -1293,7 +1290,7 @@ public:
* @param index Index of the template argument of which to return the type.
* @return The type of the i-th template argument of a type.
*/
[[nodiscard]] inline meta_type template_arg(size_type index) const ENTT_NOEXCEPT {
[[nodiscard]] inline meta_type template_arg(const size_type index) const ENTT_NOEXCEPT {
return index < template_arity() ? node->templ->arg(index) : meta_type{};
}
@@ -1311,7 +1308,7 @@ public:
* @return The number of elements along the given dimension in case of array
* types, 0 otherwise.
*/
[[nodiscard]] size_type extent(size_type dim = {}) const ENTT_NOEXCEPT {
[[nodiscard]] size_type extent(const size_type dim = {}) const ENTT_NOEXCEPT {
return node->extent(dim);
}
@@ -1660,12 +1657,37 @@ bool meta_any::set(const id_type id, Type &&value) {
}
[[nodiscard]] inline meta_any meta_any::allow_cast(const meta_type &type) const {
if(node) {
if(node->info == type.info() || visit<&internal::meta_type_node::base>(type.info(), node)) {
return as_ref();
} else if(const auto * const conv = visit<&internal::meta_type_node::conv>(type.info(), node); conv) {
return conv->conv(storage.data());
}
}
return {};
}
inline bool meta_any::allow_cast(const meta_type &type) {
if(node->info == type.info() || visit<&internal::meta_type_node::base>(type.info(), node)) {
return true;
} else if(const auto * const conv = visit<&internal::meta_type_node::conv>(type.info(), node); conv) {
*this = conv->conv(std::as_const(storage).data());
return true;
}
return false;
}
[[nodiscard]] inline meta_type meta_ctor::parent() const ENTT_NOEXCEPT {
return node->parent;
}
[[nodiscard]] inline meta_type meta_ctor::arg(size_type index) const ENTT_NOEXCEPT {
[[nodiscard]] inline meta_type meta_ctor::arg(const size_type index) const ENTT_NOEXCEPT {
return index < arity() ? node->arg(index) : meta_type{};
}
@@ -1690,7 +1712,7 @@ bool meta_any::set(const id_type id, Type &&value) {
}
[[nodiscard]] inline meta_type meta_func::arg(size_type index) const ENTT_NOEXCEPT {
[[nodiscard]] inline meta_type meta_func::arg(const size_type index) const ENTT_NOEXCEPT {
return index < arity() ? node->arg(index) : meta_type{};
}
@@ -1823,7 +1845,7 @@ private:
* @param sz The new size of the container.
* @return True in case of success, false otherwise.
*/
inline bool meta_sequence_container::resize(size_type sz) {
inline bool meta_sequence_container::resize(const size_type sz) {
return resize_fn(storage, sz);
}
@@ -1882,7 +1904,7 @@ inline meta_sequence_container::iterator meta_sequence_container::erase(iterator
* @param pos The position of the element to return.
* @return A reference to the requested element properly wrapped.
*/
[[nodiscard]] inline meta_any meta_sequence_container::operator[](size_type pos) {
[[nodiscard]] inline meta_any meta_sequence_container::operator[](const size_type pos) {
return get_fn(storage, pos);
}