double_buffer.cc
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	/* -------------------------------------------------------------------------- */
	#include "double_buffer.hh"
	#include "grid.hh"
	/* -------------------------------------------------------------------------- */

	/* -------------------------------------------------------------------------- */
	DoubleBuffer::DoubleBuffer(int m, int n)
	: m_current(new Grid(m, n)), m_old(new Grid(m, n)) {}

	/* -------------------------------------------------------------------------- */
	Grid & DoubleBuffer::current() { return *m_current; }

	/* -------------------------------------------------------------------------- */
	Grid & DoubleBuffer::old() { return *m_old; }

	/* -------------------------------------------------------------------------- */
	void DoubleBuffer::swap() {
	m_current.swap(m_old);
	}