[ITK] itk::Point extraction operator

[Wood, Tobias]

Hello,

While trying to read an itk::Point from stdin, I noticed that the insertion and extraction operators are asymmetric. The insertion operator adds [] round the point and uses commas for delimiters. The extraction operator only expects numbers with white-space as the delimiter. Hence the following code:

itk::Point<float, 3> A; A[0] = 1.; A[1] = 2.; A[2] = 3.;
	itk::Point<float, 3> B;
	std::stringstream stream;
	stream << A;
	stream >> B;
	std::cout << "A = " << A << std::endl;
	std::cout << "B = " << B << std::endl;


Produces this as output:

A = [1, 2, 3]
B = [0, 0, 0]


with no errors or exceptions thrown.

Is this intended behaviour? It was counter-intuitive to me - but in my experience dealing with formatted input via the extraction operator is a complete pain so I can understand why it was written like this! I found an interesting workaround which involves a custom locale on this Stack Overflow page - http://stackoverflow.com/questions/1894886/parsing-a-comma-delimited-stdstring

Best wishes,
Toby