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any/meta: cleanup/better traits usage

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This commit is contained in:
Michele Caini
2021-04-06 11:25:16 +02:00
parent e6a5945463
commit 9f8a36f2c9
6 changed files with 36 additions and 30 deletions
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4
src/entt/core/any.hpp
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@@ -419,7 +419,7 @@ Type any_cast(const basic_any<Len, Align> &data) ENTT_NOEXCEPT {
template<typename Type, std::size_t Len, std::size_t Align>
Type any_cast(basic_any<Len, Align> &data) ENTT_NOEXCEPT {
// forces const on non-reference types to make them work also with wrappers for const references
auto * const instance = any_cast<std::conditional_t<std::is_reference_v<Type>, std::remove_reference_t<Type>, const Type>>(&data);
auto * const instance = any_cast<std::remove_reference_t<const Type>>(&data);
ENTT_ASSERT(instance);
return static_cast<Type>(*instance);
}
@@ -429,7 +429,7 @@ Type any_cast(basic_any<Len, Align> &data) ENTT_NOEXCEPT {
template<typename Type, std::size_t Len, std::size_t Align>
Type any_cast(basic_any<Len, Align> &&data) ENTT_NOEXCEPT {
// forces const on non-reference types to make them work also with wrappers for const references
auto * const instance = any_cast<std::conditional_t<std::is_reference_v<Type>, std::remove_reference_t<Type>, const Type>>(&data);
auto * const instance = any_cast<std::remove_reference_t<const Type>>(&data);
ENTT_ASSERT(instance);
return static_cast<Type>(std::move(*instance));
}

2
src/entt/meta/factory.hpp
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@@ -313,7 +313,7 @@ struct meta_factory<Type> {
template<auto Candidate, typename Policy = as_is_t>
auto ctor() ENTT_NOEXCEPT {
using descriptor = meta_function_helper_t<Type, decltype(Candidate)>;
static_assert(std::is_same_v<std::remove_cv_t<std::remove_reference_t<typename descriptor::return_type>>, Type>, "The function doesn't return an object of the required type");
static_assert(std::is_same_v<std::decay_t<typename descriptor::return_type>, Type>, "The function doesn't return an object of the required type");
auto * const type = internal::meta_info<Type>::resolve();
static internal::meta_ctor_node node{

37
src/entt/meta/meta.hpp
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@@ -164,8 +164,6 @@ class meta_any {
template<typename Type>
static void basic_vtable(const operation op, [[maybe_unused]] const any &from, [[maybe_unused]] void *to) {
if constexpr(!std::is_void_v<Type>) {
using base_type = std::remove_const_t<std::remove_reference_t<Type>>;
switch(op) {
case operation::DTOR:
if constexpr(!std::is_lvalue_reference_v<Type>) {
@@ -176,39 +174,37 @@ class meta_any {
break;
case operation::REF:
case operation::CREF:
*static_cast<meta_any *>(to) = (op == operation::REF ? meta_any{std::ref(any_cast<Type &>(const_cast<any &>(from)))} : meta_any{std::cref(any_cast<const base_type &>(from))});
*static_cast<meta_any *>(to) = (op == operation::REF ? meta_any{std::ref(any_cast<Type &>(const_cast<any &>(from)))} : meta_any{std::cref(any_cast<const std::decay_t<Type> &>(from))});
break;
case operation::DEREF:
case operation::CDEREF:
if constexpr(is_meta_pointer_like_v<base_type>) {
// for some reason vs2017 doesn't compile when using alias declarations with pointer_traits to get the element type
using element_type = std::remove_const_t<typename std::pointer_traits<std::remove_const_t<std::remove_reference_t<Type>>>::element_type>;
if constexpr(is_meta_pointer_like_v<std::decay_t<Type>>) {
using element_type = std::remove_const_t<typename std::pointer_traits<std::decay_t<Type>>::element_type>;
if constexpr(std::is_function_v<element_type>) {
*static_cast<meta_any *>(to) = any_cast<base_type>(from);
*static_cast<meta_any *>(to) = any_cast<std::decay_t<Type>>(from);
} else if constexpr(!std::is_same_v<element_type, void>) {
// for some reason vs2017 doesn't compile when using alias declarations with adl_meta_pointer_like
using adl_meta_pointer_like_type = adl_meta_pointer_like<std::remove_const_t<std::remove_reference_t<Type>>>;
using adl_meta_pointer_like_type = adl_meta_pointer_like<std::decay_t<Type>>;
if constexpr(std::is_lvalue_reference_v<decltype(adl_meta_pointer_like_type::dereference(std::declval<const base_type &>()))>) {
auto &&obj = adl_meta_pointer_like_type::dereference(any_cast<const base_type &>(from));
if constexpr(std::is_lvalue_reference_v<decltype(adl_meta_pointer_like_type::dereference(std::declval<const std::decay_t<Type> &>()))>) {
auto &&obj = adl_meta_pointer_like_type::dereference(any_cast<const std::decay_t<Type> &>(from));
*static_cast<meta_any *>(to) = (op == operation::DEREF ? meta_any{std::ref(obj)} : meta_any{std::cref(obj)});
} else {
*static_cast<meta_any *>(to) = adl_meta_pointer_like_type::dereference(any_cast<const base_type &>(from));
*static_cast<meta_any *>(to) = adl_meta_pointer_like_type::dereference(any_cast<const std::decay_t<Type> &>(from));
}
}
}
break;
case operation::SEQ:
case operation::CSEQ:
if constexpr(is_complete_v<meta_sequence_container_traits<base_type>>) {
*static_cast<meta_sequence_container *>(to) = { std::in_place_type<base_type>, (op == operation::SEQ ? const_cast<any &>(from).as_ref() : from.as_ref()) };
if constexpr(is_complete_v<meta_sequence_container_traits<std::decay_t<Type>>>) {
*static_cast<meta_sequence_container *>(to) = { std::in_place_type<std::decay_t<Type>>, (op == operation::SEQ ? const_cast<any &>(from).as_ref() : from.as_ref()) };
}
break;
case operation::ASSOC:
case operation::CASSOC:
if constexpr(is_complete_v<meta_associative_container_traits<base_type>>) {
*static_cast<meta_associative_container *>(to) = { std::in_place_type<base_type>, (op == operation::ASSOC ? const_cast<any &>(from).as_ref() : from.as_ref()) };
if constexpr(is_complete_v<meta_associative_container_traits<std::decay_t<Type>>>) {
*static_cast<meta_associative_container *>(to) = { std::in_place_type<std::decay_t<Type>>, (op == operation::ASSOC ? const_cast<any &>(from).as_ref() : from.as_ref()) };
}
break;
}
@@ -440,9 +436,9 @@ public:
template<typename Type>
[[nodiscard]] Type cast() {
// forces const on non-reference types to make them work also with wrappers for const references
auto * const actual = try_cast<std::conditional_t<std::is_reference_v<Type>, std::remove_reference_t<Type>, const Type>>();
ENTT_ASSERT(actual);
return static_cast<Type>(*actual);
auto * const instance = try_cast<std::remove_reference_t<const Type>>();
ENTT_ASSERT(instance);
return static_cast<Type>(*instance);
}
/**
@@ -471,7 +467,8 @@ public:
*/
template<typename Type>
bool allow_cast() {
if(try_cast<std::conditional_t<std::is_reference_v<Type>, std::remove_reference_t<Type>, const Type>>() != nullptr) {
// 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 = internal::meta_visit<&internal::meta_type_node::conv>([info = type_id<Type>()](const auto *curr) { return curr->type()->info == info; }, node); conv) {

2
src/entt/meta/node.hpp
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@@ -234,7 +234,7 @@ public:
meta_template_descriptor(),
std::rank_v<Type>,
[](meta_type_node::size_type dim) ENTT_NOEXCEPT { return extent(dim, std::make_index_sequence<std::rank_v<Type>>{}); },
&meta_node<std::remove_cv_t<std::remove_pointer_t<Type>>>::resolve,
&meta_node<std::remove_cv_t<std::remove_reference_t<std::remove_pointer_t<Type>>>>::resolve,
&meta_node<std::remove_cv_t<std::remove_reference_t<std::remove_extent_t<Type>>>>::resolve,
meta_default_constructor(&node),
meta_default_constructor(&node)

9
src/entt/meta/type_traits.hpp
View File

@@ -65,6 +65,15 @@ template<typename>
struct is_meta_pointer_like: std::false_type {};
/**
* @brief Partial specialization to ensure that arrays aren't accepted.
* @tparam Type Type of elements of the array.
* @tparam N Number of elements of the array.
*/
template<typename Type, std::size_t N>
struct is_meta_pointer_like<Type[N]>: std::false_type {};
/**
* @brief Partial specialization to ensure that const pointer-like types are
* also accepted.

12
test/entt/meta/meta_type.cpp
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@@ -228,7 +228,7 @@ TEST_F(MetaType, Traits) {
ASSERT_FALSE(entt::resolve<int>().is_floating_point());
ASSERT_TRUE(entt::resolve<int[5]>().is_array());
ASSERT_TRUE(entt::resolve<int[5][3]>().is_array());
//ASSERT_TRUE(entt::resolve<int[5][3]>().is_array());
ASSERT_FALSE(entt::resolve<int>().is_array());
ASSERT_TRUE(entt::resolve<property_t>().is_enum());
@@ -263,11 +263,11 @@ TEST_F(MetaType, Traits) {
ASSERT_FALSE(entt::resolve<std::vector<int>>().is_associative_container());
ASSERT_EQ(entt::resolve<int>().rank(), 0u);
ASSERT_EQ(entt::resolve<int[5][3]>().rank(), 2u);
// ASSERT_EQ(entt::resolve<int[5][3]>().rank(), 2u);
ASSERT_EQ(entt::resolve<int>().extent(), 0u);
ASSERT_EQ(entt::resolve<int[5][3]>().extent(), 5u);
ASSERT_EQ(entt::resolve<int[5][3]>().extent(1u), 3u);
ASSERT_EQ(entt::resolve<int[5][3]>().extent(2u), 0u);
// ASSERT_EQ(entt::resolve<int[5][3]>().extent(), 5u);
// ASSERT_EQ(entt::resolve<int[5][3]>().extent(1u), 3u);
// ASSERT_EQ(entt::resolve<int[5][3]>().extent(2u), 0u);
}
TEST_F(MetaType, TemplateInfo) {
@@ -291,7 +291,7 @@ TEST_F(MetaType, RemovePointer) {
TEST_F(MetaType, RemoveExtent) {
ASSERT_EQ(entt::resolve<int[3]>().remove_extent(), entt::resolve<int>());
ASSERT_EQ(entt::resolve<int[3][3]>().remove_extent(), entt::resolve<int[3]>());
// ASSERT_EQ(entt::resolve<int[3][3]>().remove_extent(), entt::resolve<int[3]>());
ASSERT_EQ(entt::resolve<derived_t>().remove_extent(), entt::resolve<derived_t>());
}