struct Equation_functor : NonLinearOptimizationFunctor<double> { DataSource *series; ExplicitEquation *fSource; Equation_functor() : NonLinearOptimizationFunctor() {}
struct Equation_functor : NonLinearOptimizationFunctor<double> { DataSource *series; ExplicitEquation *fSource; Equation_functor() : NonLinearOptimizationFunctor<double>() {} --- correction here ---
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