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meta: added meta_function_descriptor_traits to avoid repetition and errors

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This commit is contained in:
Michele Caini
2022-09-14 09:46:11 +02:00
parent 88fd79069b
commit b9e60c679a
1 changed files with 50 additions and 55 deletions
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105
src/entt/meta/utility.hpp
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@@ -12,6 +12,26 @@
namespace entt {
/**
* @brief Meta function descriptor traits.
* @tparam Ret Function return type.
* @tparam Args Function arguments.
* @tparam Static Function staticness.
* @tparam Const Function constness.
*/
template<typename Ret, typename Args, bool Static, bool Const>
struct meta_function_descriptor_traits {
/*! @brief Meta function return type. */
using return_type = Ret;
/*! @brief Meta function arguments. */
using args_type = Args;
/*! @brief True if the meta function is static, false otherwise. */
static constexpr bool is_static = Static;
/*! @brief True if the meta function is const, false otherwise. */
static constexpr bool is_const = Const;
};
/*! @brief Primary template isn't defined on purpose. */
template<typename, typename>
struct meta_function_descriptor;
@@ -24,17 +44,12 @@ struct meta_function_descriptor;
* @tparam Args Function arguments.
*/
template<typename Type, typename Ret, typename Class, typename... Args>
struct meta_function_descriptor<Type, Ret (Class::*)(Args...) const> {
/*! @brief Meta function return type. */
using return_type = Ret;
/*! @brief Meta function arguments. */
using args_type = std::conditional_t<std::is_base_of_v<Class, Type>, type_list<Args...>, type_list<const Class &, Args...>>;
/*! @brief True if the meta function is const, false otherwise. */
static constexpr auto is_const = true;
/*! @brief True if the meta function is static, false otherwise. */
static constexpr auto is_static = !std::is_base_of_v<Class, Type>;
};
struct meta_function_descriptor<Type, Ret (Class::*)(Args...) const>
: meta_function_descriptor_traits<
Ret,
std::conditional_t<std::is_base_of_v<Class, Type>, type_list<Args...>, type_list<const Class &, Args...>>,
!std::is_base_of_v<Class, Type>,
true> {};
/**
* @brief Meta function descriptor.
@@ -44,17 +59,12 @@ struct meta_function_descriptor<Type, Ret (Class::*)(Args...) const> {
* @tparam Args Function arguments.
*/
template<typename Type, typename Ret, typename Class, typename... Args>
struct meta_function_descriptor<Type, Ret (Class::*)(Args...)> {
/*! @brief Meta function return type. */
using return_type = Ret;
/*! @brief Meta function arguments. */
using args_type = std::conditional_t<std::is_base_of_v<Class, Type>, type_list<Args...>, type_list<Class &, Args...>>;
/*! @brief True if the meta function is const, false otherwise. */
static constexpr auto is_const = false;
/*! @brief True if the meta function is static, false otherwise. */
static constexpr auto is_static = !std::is_base_of_v<Class, Type>;
};
struct meta_function_descriptor<Type, Ret (Class::*)(Args...)>
: meta_function_descriptor_traits<
Ret,
std::conditional_t<std::is_base_of_v<Class, Type>, type_list<Args...>, type_list<Class &, Args...>>,
!std::is_base_of_v<Class, Type>,
false> {};
/**
* @brief Meta function descriptor.
@@ -63,17 +73,12 @@ struct meta_function_descriptor<Type, Ret (Class::*)(Args...)> {
* @tparam Ret Data member type.
*/
template<typename Type, typename Ret, typename Class>
struct meta_function_descriptor<Type, Ret Class::*> {
/*! @brief Meta data return type. */
using return_type = Ret &;
/*! @brief Meta data arguments. */
using args_type = std::conditional_t<std::is_base_of_v<Class, Type>, type_list<>, type_list<Class &>>;
/*! @brief True if the meta data is const, false otherwise. */
static constexpr auto is_const = false;
/*! @brief True if the meta data is static, false otherwise. */
static constexpr auto is_static = !std::is_base_of_v<Class, Type>;
};
struct meta_function_descriptor<Type, Ret Class::*>
: meta_function_descriptor_traits<
Ret &,
std::conditional_t<std::is_base_of_v<Class, Type>, type_list<>, type_list<Class &>>,
!std::is_base_of_v<Class, Type>,
false> {};
/**
* @brief Meta function descriptor.
@@ -83,17 +88,12 @@ struct meta_function_descriptor<Type, Ret Class::*> {
* @tparam Args Other function arguments.
*/
template<typename Type, typename Ret, typename MaybeType, typename... Args>
struct meta_function_descriptor<Type, Ret (*)(MaybeType, Args...)> {
/*! @brief Meta function return type. */
using return_type = Ret;
/*! @brief Meta function arguments. */
using args_type = std::conditional_t<std::is_base_of_v<std::remove_cv_t<std::remove_reference_t<MaybeType>>, Type>, type_list<Args...>, type_list<MaybeType, Args...>>;
/*! @brief True if the meta function is const, false otherwise. */
static constexpr auto is_const = std::is_base_of_v<std::remove_cv_t<std::remove_reference_t<MaybeType>>, Type> && std::is_const_v<std::remove_reference_t<MaybeType>>;
/*! @brief True if the meta function is static, false otherwise. */
static constexpr auto is_static = !std::is_base_of_v<std::remove_cv_t<std::remove_reference_t<MaybeType>>, Type>;
};
struct meta_function_descriptor<Type, Ret (*)(MaybeType, Args...)>
: meta_function_descriptor_traits<
Ret,
std::conditional_t<std::is_base_of_v<std::remove_cv_t<std::remove_reference_t<MaybeType>>, Type>, type_list<Args...>, type_list<MaybeType, Args...>>,
!std::is_base_of_v<std::remove_cv_t<std::remove_reference_t<MaybeType>>, Type>,
std::is_base_of_v<std::remove_cv_t<std::remove_reference_t<MaybeType>>, Type> && std::is_const_v<std::remove_reference_t<MaybeType>>> {};
/**
* @brief Meta function descriptor.
@@ -101,17 +101,12 @@ struct meta_function_descriptor<Type, Ret (*)(MaybeType, Args...)> {
* @tparam Ret Function return type.
*/
template<typename Type, typename Ret>
struct meta_function_descriptor<Type, Ret (*)()> {
/*! @brief Meta function return type. */
using return_type = Ret;
/*! @brief Meta function arguments. */
using args_type = type_list<>;
/*! @brief True if the meta function is const, false otherwise. */
static constexpr auto is_const = false;
/*! @brief True if the meta function is static, false otherwise. */
static constexpr auto is_static = true;
};
struct meta_function_descriptor<Type, Ret (*)()>
: meta_function_descriptor_traits<
Ret,
type_list<>,
true,
false> {};
/**
* @brief Meta function helper.