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example-macro.cpp
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/**
* ***README***
* You will see that a LOT of code is being generated by these macros.
* You might be worried about compile times... Of course, compile times will increase
* but not by much. Stress tests show that compiling 1000 classes with 5 reflected members each,
* of which three functions and two fields, takes about 5s on an i7 mobile CPU with latest GCC/Clang.
*
* There are efforts to reduce those further. Some optimizations are already in place,
* for example the added template<Unused__> on member<N>s proved helpful. Remember that compilers
* do NOT even attempt to generate code for templates which are not instantiated (in fact, they can't).
* So no code is generated for member metadata that goes unused.
*
* The latest attempt to further reduce compile times was by removing the need to two invoke() functions, and
* by using a unified auto_resolve function which resolves and returns the pointer to the function using provided types.
* This required a lot of template utilities externally of what is generated through the macro, but reduced compile types by 17%.
* This work resides in the experimental-pointer-dispatch branch and is currently being tested.
*
* Also note that the infrastructure for proxies, although it seems heavyweight, has only about 15% impact on compilation times.
* If this is a problem for you, please open an issue and we might consider adding support for opting-out of proxies.
*/
struct Serializable : refl::attr::usage::member
{
};
class Shape {};
class Circle : public Shape {
double r;
public:
Circle(double r) : r(r) {}
double getRadius() const;
double getDiameter() const;
double getArea() const;
};
REFL_AUTO(
type(Circle, bases<>),
func(getRadius),
func(getDiameter),
func(getArea, property("area"), Serializable())
)
/// --- ABOVE MACRO EXPANDS TO ---
namespace refl_impl::metadata {
template<> struct type_info__<Circle> {
typedef Circle type;
static constexpr auto attributes{ ::refl::detail::make_attributes<::refl::attr::usage::type>(bases<>) };
static constexpr auto name{ ::refl::util::make_const_string("Circle") };
static constexpr size_t member_index_offset = 3 + 1;
template <size_t N, typename = void>
struct member {};
template<typename Unused__> struct member<4 - member_index_offset, Unused__> {
typedef ::refl::member::function member_type;
static constexpr auto name{ ::refl::util::make_const_string("getRadius") };
static constexpr auto attributes{ ::refl::detail::make_attributes<::refl::attr::usage::type>() };
public:
template<typename Self, typename... Args> static constexpr auto invoke(Self&& self, Args&&... args) -> decltype(std::declval<Self>().getRadius(::std::declval<Args>()...)) {
return ::std::forward<Self>(self).getRadius(::std::forward<Args>(args)...);
}
template<typename... Args> static constexpr auto invoke(Args&&... args) -> decltype(::refl::detail::head_t<type, Args...>::getRadius(::std::declval<Args>()...)) {
return ::refl::detail::head_t<type, Args...>::getRadius(::std::forward<Args>(args)...);
}
template <typename Dummy = void>
static constexpr auto pointer() -> decltype(&::refl::detail::head_t<type, Dummy>::getRadius) { return &::refl::detail::head_t<type, Dummy>::getRadius; }
template <typename Proxy> struct remap {
template <typename... Args> decltype(auto) getRadius(Args&&... args) {
return Proxy::invoke_impl(static_cast<Proxy&>(*this), ::std::forward<Args>(args)...);
}
template <typename... Args> decltype(auto) getRadius(Args&&... args) const {
return Proxy::invoke_impl(static_cast<const Proxy&>(*this), ::std::forward<Args>(args)...);
}
};
}; // struct member<4 - member_index_offset, Unused__>
template<typename Unused__> struct member<5 - member_index_offset, Unused__> {
typedef ::refl::member::function member_type;
static constexpr auto name{ ::refl::util::make_const_string("getDiameter") };
static constexpr auto attributes{ ::refl::detail::make_attributes<::refl::attr::usage::type>() };
public:
template<typename Self, typename... Args> static constexpr auto invoke(Self&& self, Args&&... args) -> decltype(std::declval<Self>().getDiameter(::std::declval<Args>()...)) {
return ::std::forward<Self>(self).getDiameter(::std::forward<Args>(args)...);
}
template<typename... Args> static constexpr auto invoke(Args&&... args) -> decltype(::refl::detail::head_t<type, Args...>::getDiameter(::std::declval<Args>()...)) {
return ::refl::detail::head_t<type, Args...>::getDiameter(::std::forward<Args>(args)...);
}
template <typename Dummy = void>
static constexpr auto pointer() -> decltype(&::refl::detail::head_t<type, Dummy>::getDiameter) { return &::refl::detail::head_t<type, Dummy>::getDiameter; }
template <typename Proxy> struct remap {
template <typename... Args> decltype(auto) getDiameter(Args&&... args) {
return Proxy::invoke_impl(static_cast<Proxy&>(*this), ::std::forward<Args>(args)...);
}
template <typename... Args> decltype(auto) getDiameter(Args&&... args) const {
return Proxy::invoke_impl(static_cast<const Proxy&>(*this), ::std::forward<Args>(args)...);
}
};
}; // struct member<5 - member_index_offset, Unused__>
template<typename Unused__> struct member<6 - member_index_offset, Unused__> {
typedef ::refl::member::function member_type;
static constexpr auto name{ ::refl::util::make_const_string("getArea") };
static constexpr auto attributes{ ::refl::detail::make_attributes<::refl::attr::usage::type>(property("area"), Serializable()) };
public:
template<typename Self, typename... Args> static constexpr auto invoke(Self&& self, Args&&... args) -> decltype(std::declval<Self>().getArea(::std::declval<Args>()...)) {
return ::std::forward<Self>(self).getArea(::std::forward<Args>(args)...);
}
template<typename... Args> static constexpr auto invoke(Args&&... args) -> decltype(::refl::detail::head_t<type, Args...>::getArea(::std::declval<Args>()...)) {
return ::refl::detail::head_t<type, Args...>::getArea(::std::forward<Args>(args)...);
}
template <typename Dummy = void>
static constexpr auto pointer() -> decltype(&::refl::detail::head_t<type, Dummy>::getArea) { return &::refl::detail::head_t<type, Dummy>::getArea; }
template <typename Proxy> struct remap {
template <typename... Args> decltype(auto) getArea(Args&&... args) {
return Proxy::invoke_impl(static_cast<Proxy&>(*this), ::std::forward<Args>(args)...);
}
template <typename... Args> decltype(auto) getArea(Args&&... args) const {
return Proxy::invoke_impl(static_cast<const Proxy&>(*this), ::std::forward<Args>(args)...);
}
};
}; // struct member<6 - member_index_offset, Unused__>
static constexpr size_t member_count{ 7 - member_index_offset }; \
}; // struct type_info__<Circle>
} // namespace refl_impl::metadata