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		~Grid2D() {}
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		~Grid2D() {}
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		Grid2D(int i, int j, const T& val): XDIM(i), YDIM(j), pixels(i*j, val) {}
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		Grid2D(int i, int j, const T& val): XDIM(i), YDIM(j), pixels(i*j, val) {}
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		Grid2D(int i, int j): XDIM(i), YDIM(j), pixels(i*j) {}
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		Grid2D(int i, int j): XDIM(i), YDIM(j), pixels(i*j) {}
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		Grid2D(): XDIM(0), YDIM(0) {}
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		void resize(int i, int j)
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				{
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						XDIM = i;
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						YDIM = j;
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						pixels.resize(i*j);
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				}
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		const T& operator()(int i, int j) const
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		const T& operator()(int i, int j) const
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		{
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		{
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		  assert(i>=0 && i< XDIM);
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		  assert(i>=0 && i< XDIM);
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		  assert(j>=0 && j< YDIM);
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		  assert(j>=0 && j< YDIM);