body.h
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	#ifndef __BODY_H__
	#define __BODY_H__

	#include <iosfwd>
	#include "symbasic/dvector.h"
	#include "symbasic/svector.h"

	typedef SVector<double, 2> Vec2D;
	typedef SVector<Vec2D, 2> BodyCoords;
	typedef DVector<BodyCoords> SysCoords;

	/* SysCoords structure
	*
	* Body 1:
	* Speed: (Vx, Vy)
	* Position: (x, y)
	* Body 2:
	* Speed: (Vx, Vy)
	* Position: (x, y)
	* ...
	* Body n:
	* Speed: (Vx, Vy)
	* Position: (x, y)
	*/

	struct Body {

	double m;

	Vec2D v;
	Vec2D x;

	bool fixed;

	const Vec2D& position() const
	{
	return x;
	}

	const Vec2D& velocity() const
	{
	return v;
	}

	const BodyCoords coordinates() const
	{
	return BodyCoords({v, x});
	}

	void update(const BodyCoords &entry)
	{
	v = entry[0];
	x = entry[1];
	}

	bool isFixed() const
	{
	return fixed;
	}
	};

	std::istream& operator>>(std::istream& is, Vec2D& v);

	std::istream& operator>>(std::istream& is, Body &body);

	std::ostream& operator<<(std::ostream& os, const Body &body);

	#endif