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ACTS
Experiment-independent tracking
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VertexFitProblem and a Cache VertexFitProblem and a Cache VertexFitProblem, which describes the vertices to be fitted and is owned by the caller, and Cache, which holds the fitter's scratch data. Construct those two separately and use the corresponding fit and addVtxToFit overloads instead. AnyConstTrackStateProxy, which is compiled once in the Acts core library: VertexFitCandidate, which describes the vertex to be fitted, and the private fitter cache, which holds the fitter's per-vertex scratch data. This type merges the two and is kept only so that code written against the pre-split AdaptiveMultiVertexFitter::State keeps compiling; it is no longer used by the fitter itself.