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#ifndef RFL_FLATTEN_HPP_
#define RFL_FLATTEN_HPP_
#include <algorithm>
#include <string_view>
#include <tuple>
#include <type_traits>
#include <utility>
namespace rfl {
/// Used to embed another struct into the generated output.
template <class T>
struct Flatten {
/// The underlying type.
using Type = std::remove_cvref_t<T>;
Flatten() = default;
Flatten(const Type& _value) : value_(_value) {}
Flatten(Type&& _value) noexcept : value_(std::forward<Type>(_value)) {}
Flatten(const Flatten<T>& _f) = default;
Flatten(Flatten<T>&& _f) noexcept = default;
template <class U>
Flatten(const Flatten<U>& _f) : value_(_f.get()) {}
template <class U>
Flatten(Flatten<U>&& _f) : value_(_f.get()) {}
template <class U, typename std::enable_if<std::is_convertible_v<U, Type>,
bool>::type = true>
Flatten(const U& _value) : value_(_value) {}
template <class U, typename std::enable_if<std::is_convertible_v<U, Type>,
bool>::type = true>
Flatten(U&& _value) : value_(_value) {}
~Flatten() = default;
/// Returns the underlying object.
Type& get() { return value_; }
/// Returns the underlying object.
const Type& get() const { return value_; }
/// Returns the underlying object.
Type& operator()() { return value_; }
/// Returns the underlying object.
const Type& operator()() const { return value_; }
/// Assigns the underlying object.
Flatten<T>& operator=(const T& _value) {
value_ = _value;
return *this;
}
/// Assigns the underlying object.
Flatten<T>& operator=(T&& _value) {
value_ = std::forward<Type>(_value);
return *this;
}
/// Assigns the underlying object.
template <class U, typename std::enable_if<std::is_convertible_v<U, Type>,
bool>::type = true>
Flatten<T>& operator=(const U& _value) {
value_ = _value;
return *this;
}
/// Assigns the underlying object.
Flatten<T>& operator=(const Flatten<T>& _f) = default;
/// Assigns the underlying object.
Flatten<T>& operator=(Flatten<T>&& _f) = default;
/// Assigns the underlying object.
template <class U>
Flatten<T>& operator=(const Flatten<U>& _f) {
value_ = _f.get();
return *this;
}
/// Assigns the underlying object.
template <class U>
Flatten<T>& operator=(Flatten<U>&& _f) {
value_ = std::forward<U>(_f);
return *this;
}
/// Three-way comparison operator
template <class U>
auto operator<=>(const Flatten<U>& _f) const {
return value_ <=> _f.value_;
}
/// Equality comparison operator.
template <class U>
bool operator==(const Flatten<U>& _f) const {
return value_ == _f.get();
}
/// Assigns the underlying object.
void set(const Type& _value) { value_ = _value; }
/// Assigns the underlying object.
void set(Type&& _value) { value_ = std::forward<Type>(_value); }
/// The underlying value.
Type value_;
};
} // namespace rfl
#endif
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