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selector.hpp
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selector.hpp
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#pragma once
#include "api.hpp"
namespace glua {
class selector_base;
namespace detail {
template<typename Ret, typename... Args>
struct _call_impl {
inline static Ret call(lua_State& l, Args&&... args) {
api::push(l, std::forward<Args>(args)...);
api::call(l, sizeof...(Args), 1);
return api::checkGet<Ret>(l);
}
};
template<typename... Rets, typename... Args>
struct _call_impl<std::tuple<Rets...>, Args...> {
inline static std::tuple<Rets...> call(lua_State& l, Args&&... args) {
api::push(l, std::forward<Args>(args)...);
api::call(l, sizeof...(Args), sizeof...(Rets));
return api::checkGet<std::tuple<Rets...>>(l);
}
};
struct ret {
private:
lua_State& l;
friend class ::glua::selector_base;
ret(lua_State& l) : l(l) {}
public:
template<typename T>
inline auto get()
-> decltype(api::checkGet<T>(l))
{
return api::checkGet<T>(l);
}
template<typename T>
inline operator T() {
return get<T>();
}
};
} // namespace detail
class selector_base {
public:
lua_State& l;
virtual ~selector_base() {}
virtual void push() = 0;
selector_base(const selector_base&) = delete;
selector_base& operator=(const selector_base&) = delete;
//selector_base(selector_base&&) = delete;
template<typename T>
void set(T val);
template<typename T>
inline auto get()
-> decltype(api::checkGet<T>(l))
{
this->push();
decltype(api::checkGet<T>(l)) val = api::checkGet<T>(l);
return val;
}
template<typename T, typename = typename
std::enable_if<
(std::is_pod<T>::value ||
std::is_fundamental<T>::value ||
std::is_pointer<T>::value ) &&
!std::is_reference<T>::value
>::type
>
inline operator T() {
return get<T>();
}
template<typename... Args>
inline detail::ret operator()(Args&&... args) {
this->push();
//return detail::_call_impl<Ret, Args...>::call(l, std::forward<Args>(args)...);
api::push(l, std::forward<Args>(args)...);
api::call(l, sizeof...(Args), LUA_MULTRET);
return detail::ret(l);
}
protected:
selector_base(lua_State& l) : l(l) {}
};
template<typename Key>
class selector : public selector_base {
public:
inline virtual void push() {
api::getTable(l, key);
}
template<typename T>
void set(T val) { api::setTable(l, key, val); }
template<typename T>
inline void operator=(T val) { set(val); }
template<typename K>
inline auto operator[](K&& nextKey) && -> selector<K> {
this->push();
return selector<K>(l, std::forward<K>(nextKey));
}
protected:
inline selector(lua_State& l, Key&& key) : selector_base(l), key(key) {}
inline selector(lua_State& l, const Key& key) : selector_base(l), key(key) {}
Key key;
};
} // namespace glua