Method FunctionState

include/cppoptlib/function_base.h:315–315

Legacy x-only constructor. Leaves value = 0 and gradient = empty; the caller must populate them before the state is consumed by the new eval-free code paths. Kept so existing user code that writes `FunctionState(x0)` continues to compile; the outer solver `Minimize` will evaluate `function(x)` once and rebuild a fully-populated state.

  // `FunctionState(x0)` continues to compile; the outer solver `Minimize`
  // will evaluate `function(x)` once and rebuild a fully-populated state.
  explicit FunctionState(VectorType x_in) : x(std::move(x_in)) {}

  // Evaluate `function` at `x` once and populate all fields.
  template <class FunctionT>