unit_vector_free.hpp

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#ifndef STAN_MATH_PRIM_FUN_UNIT_VECTOR_FREE_HPP
#define STAN_MATH_PRIM_FUN_UNIT_VECTOR_FREE_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/to_ref.hpp>
#include <cmath>
 
namespace stan {
namespace math {
 
template <typename EigVec, require_eigen_col_vector_t<EigVec>* = nullptr>
inline auto unit_vector_free(EigVec&& x) {
  auto&& x_ref = to_ref(std::forward<EigVec>(x));
  check_unit_vector("stan::math::unit_vector_free", "Unit vector variable",
                    x_ref);
  return x_ref;
}
 
template <typename T, require_std_vector_t<T>* = nullptr>
auto unit_vector_free(const T& x) {
  return apply_vector_unary<T>::apply(
      x, [](auto&& v) { return unit_vector_free(v); });
}
 
}  // namespace math
}  // namespace stan
 
#endif