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David Frank authored
So far, the interface functions `evaluate`, `getGradient`, `getHessian` were non-const functions. This was okay as we mostly clone Functionals and then use them an non-const object. However, this is prohibitive for some other function and usage styles and is plainly wrong. This is a small change thou the file list touches a lot. Most changes are only a single touch in 3 lines.
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