|Re: [eigen] Interesting C++ standard proposal|
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auto a = A.block(...); does the user want a copy of the submatrix or a lightweight view?Actually, an even more trivial example would be this: auto B = A; // is B a reference or a copy?
Isn't auto& always needed in order to get a reference to a C++ or STL object? It would be surprising if eigen behaved differently.
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