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#pragma once
#include <concepts>
#include <string>
#include <string_view>
#include <openvic-dataloader/detail/SelfType.hpp>
#include <openvic-dataloader/detail/TypeName.hpp>
#define OV_DETAIL_GET_TYPE_BASE_CLASS(CLASS) \
static constexpr std::string_view get_type_static() { return ::ovdl::detail::type_name<CLASS>(); } \
constexpr virtual std::string_view get_type() const = 0; \
static constexpr std::string_view get_base_type_static() { return ::ovdl::detail::type_name<CLASS>(); } \
constexpr virtual std::string_view get_base_type() const { return get_base_type_static(); } \
template<typename T> constexpr bool is_type() const { \
return get_type().compare(::ovdl::detail::type_name<T>()) == 0; } \
template<typename T> constexpr bool is_derived_from() const { \
return is_type<T>() || get_base_type().compare(::ovdl::detail::type_name<T>()) == 0; } \
template<typename T> constexpr T* cast_to() { \
if (is_derived_from<T>() || is_type<CLASS>()) return (static_cast<T*>(this)); \
return nullptr; } \
template<typename T> constexpr const T* const cast_to() const { \
if (is_derived_from<T>() || is_type<CLASS>()) return (static_cast<const T*>(this)); \
return nullptr; }
#define OV_DETAIL_GET_TYPE \
struct _self_type_tag {}; \
constexpr auto _self_type_helper()->decltype(::ovdl::detail::Writer<_self_type_tag, decltype(this)> {}); \
using type = ::ovdl::detail::Read<_self_type_tag>; \
static constexpr std::string_view get_type_static() { return ::ovdl::detail::type_name<type>(); } \
constexpr std::string_view get_type() const override { \
return ::ovdl::detail::type_name<std::decay_t<decltype(*this)>>(); }
#define OV_DETAIL_GET_BASE_TYPE(CLASS) \
static constexpr std::string_view get_base_type_static() { return ::ovdl::detail::type_name<CLASS>(); } \
constexpr std::string_view get_base_type() const override { \
return ::ovdl::detail::type_name<std::decay_t<decltype(*this)>>(); }
#define REF_GETTERS(var) \
constexpr decltype(var)& get_##var() { \
return var; \
} \
constexpr decltype(var) const& get_##var() const { \
return var; \
}
namespace OpenVic {
struct ReturnByValueProperty {};
/*
* Template function used to choose the return type and provide the implementation for the
* for variable getters created using the PROPERTY macro.
*/
template<typename decl, typename T>
inline constexpr decltype(auto) _get_property(const T& property) {
if constexpr(std::is_reference_v<decl>) {
/* Return const reference */
return property;
} else if constexpr (std::same_as<T, std::string>) {
/* Return std::string_view looking at std::string */
return std::string_view { property };
} else if constexpr (
std::integral<T> || std::floating_point<T> || std::is_enum<T>::value || std::derived_from<T, ReturnByValueProperty>
) {
/* Return value */
return T { property };
} else if constexpr(std::is_pointer<T>::value) {
/* Return const pointer */
return static_cast<std::add_pointer_t<std::add_const_t<std::remove_pointer_t<T>>>>(property);
} else {
/* Return const reference */
return property;
}
}
/*
* Use this on a variable delcaration to generate a getter function. It assumes the variable is private and so
* sets the accessibility modifier state back to private after declaring the getter as public.
* Examples:
* int PROPERTY(x); // int x; int get_x() const;
* const std::string PROPERTY(name); // const std::string name; std::string_view get_name() const;
* std::vector<int> PROPERTY(sizes); // std::vector<int> sizes; std::vector<int> const& get_sizes() const;
* uint8_t const* PROPERTY(data); // uint8_t const* data; uint8_t const* get_data() const;
* colour_t* PROPERTY(pixels); // colour_t* pixels; colour_t const* get_pixels() const;
* CultureGroup const& PROPERTY(group);// CultureGroup const& group; CultureGroup const& get_group() const;
* Province& PROPERTY(province); // Province& province; Province const& get_province() const;
*/
#define PROPERTY(NAME) \
NAME; \
\
public: \
auto get_##NAME() const -> decltype(OpenVic::_get_property<decltype(NAME)>(NAME)) { \
return OpenVic::_get_property<decltype(NAME)>(NAME); \
} \
\
private:
}
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