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#pragma once
#include <concepts>
#include <string>
#include <string_view>
#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 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:
// TODO: Special logic to decide argument type and control assignment.
#define PROPERTY_RW(NAME) \
PROPERTY(NAME) \
public: \
void set_##NAME(decltype(NAME) new_##NAME) { \
NAME = new_##NAME; \
} \
private:
}
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