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Re:Streams – Lazy evaluation in C++14 by fanssex on Sunday June 22, 2014 @09:32PM (#7929776)
1. loop: x + y, loop (x + y) * z, loop (x + y) * z - w.

2. loop: (x[i,...,n] + y[i,...,n]) * z[i,...,n] - w[i,...,n]

although I don't think the loops are going to be the main overhead in this case.

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