[mlpack-git] [mlpack] Low-rank constraint matrices in LRSDP (#578)

[Evan Patterson]

@rcurtin: Thanks for the suggestion. I've been thinking about how to most cleanly implement this feature.

The approach via variadic templates is interesting, but making that work would probably require some [template black magic](http://stackoverflow.com/questions/27941661). Now appetites for these things vary, but that's a bit much for me. Or maybe you had something else in mind?

What do you think about using either a traditional inheritence-based approach or `std::function`? There is some additional runtime overhead compared to templates, but it should be negligible compared to the linear algebra.

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