tree a192b9090b7110206354f44acd69a36e2fc6721b
parent 2fc0ed6143ad499d6dc82d621ff5ec69170beb52
author Sameer Agarwal <sameeragarwal@google.com> 1358543492 -0800
committer Sameer Agarwal <sameeragarwal@google.com> 1358546507 -0800

NumericDiffFunctor.

A wrapper class that takes a variadic functor evaluating a
function, numerically differentiates it and makes it available as a
templated functor so that it can be easily used as part of Ceres'
automatic differentiation framework.

The tests for NumericDiffCostFunction and NumericDiffFunctor have
a lot of stuff that is common, so refactor them to reduce code.

Change-Id: I83b01e58b05e575fb2530d15cbd611928298646a