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wip: make shared traits usable

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This commit is contained in:
Michele Caini
2019-02-17 23:04:02 +01:00
parent 617635a989
commit f7c756d215
4 changed files with 56 additions and 33 deletions
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76
src/entt/core/type_traits.hpp
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@@ -43,14 +43,55 @@ template<typename>
struct shared_traits;
/**
* @brief Specialization used to get rid of constness.
* @tparam Type Shared type.
*/
template<typename Type>
struct shared_traits<const Type>
: shared_traits<Type>
{};
/**
* @brief Provides the member constant `value` to true if a given type is
* shared. In all other cases, `value` is false.
*/
template<typename, typename = std::void_t<>>
struct is_shared: std::false_type {};
/**
* @brief Provides the member constant `value` to true if a given type is
* shared. In all other cases, `value` is false.
* @tparam Type Potentially shared type.
*/
template<typename Type>
struct is_shared<Type, std::void_t<typename shared_traits<std::decay_t<Type>>::type>>: std::true_type {};
/**
* @brief Helper variable template.
*
* True if a given type is shared, false otherwise.
*
* @tparam Type Potentially shared type.
*/
template<class Type>
constexpr auto is_shared_v = is_shared<Type>::value;
}
/**
* @brief Makes an already existing type a shared type.
* @param type Type to make shareable.
*/
#define ENTT_SHARED_TYPE(type)\
template<>\
struct shared_traits<type>\
: std::integral_constant<typename hashed_string::hash_type, hashed_string::to_value(#type)>\
struct entt::shared_traits<type>\
: std::integral_constant<typename entt::hashed_string::hash_type, entt::hashed_string::to_value(#type)>\
{}
@@ -74,35 +115,4 @@ struct shared_traits;
class clazz
/**
* @brief Provides the member constant `value` to true if a given type is
* shared. In all other cases, `value` is false.
*/
template<typename>
struct is_shared: std::false_type {};
/**
* @brief Provides the member constant `value` to true if a given type is
* shared. In all other cases, `value` is false.
* @tparam Type Potentially shared type.
*/
template<typename Type>
struct is_shared<shared_traits<Type>>: std::true_type {};
/**
* @brief Helper variable template.
*
* True if a given type is shared, false otherwise.
*
* @tparam Type Potentially shared type.
*/
template<class Type>
constexpr auto is_shared_v = is_shared<Type>::value;
}
#endif // ENTT_CORE_TYPE_TRAITS_HPP

5
test/lib/a_module.cpp
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@@ -10,6 +10,11 @@
#endif
#endif
ENTT_SHARED_TYPE(int);
ENTT_SHARED_TYPE(char);
ENTT_SHARED_TYPE(double);
ENTT_SHARED_TYPE(float);
LIB_EXPORT typename entt::registry<>::component_type a_module_int_type() {
entt::registry<> registry;

5
test/lib/another_module.cpp
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@@ -10,6 +10,11 @@
#endif
#endif
ENTT_SHARED_TYPE(int);
ENTT_SHARED_TYPE(char);
ENTT_SHARED_TYPE(double);
ENTT_SHARED_TYPE(float);
LIB_EXPORT typename entt::registry<>::component_type another_module_int_type() {
entt::registry<> registry;

3
test/lib/lib.cpp
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@@ -6,6 +6,9 @@ extern typename entt::registry<>::component_type a_module_char_type();
extern typename entt::registry<>::component_type another_module_int_type();
extern typename entt::registry<>::component_type another_module_char_type();
ENTT_SHARED_TYPE(int);
ENTT_SHARED_TYPE(char);
TEST(Lib, Shared) {
entt::registry<> registry;