libsimple_motion/source/simple/motion/common.hpp

#ifndef SIMPLE_MOTION_COMMON_HPP
#define SIMPLE_MOTION_COMMON_HPP
#include "simple/support/range.hpp"
#include "simple/support/type_traits/conversions.hpp" // converts_to

namespace simple::motion
{

template <typename T>
concept basic = requires(T t)
{
	{t.advance(typename T::duration{})} -> support::converts_to<bool>;
	{t.done()} -> support::converts_to<bool>;
	t.reset();
	// FIXME: pain points
	// t.value();
	// t.move(, T::duration{})
};

template <typename Duration>
struct advance_result
{
	bool done;
	Duration remaining{};
	explicit operator bool() { return done; } // negate?
};

template <typename Duration, typename It = size_t>
struct multi_advance_result : public advance_result<Duration>
{
	support::range<It> updated {};
	using advance_result<Duration>::operator bool;
};


} // namespace simple::motion

#endif /* end of include guard */