distance.hpp

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#ifndef STAN_MATH_PRIM_FUN_DISTANCE_HPP
#define STAN_MATH_PRIM_FUN_DISTANCE_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/abs.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/squared_distance.hpp>
#include <stan/math/prim/fun/sqrt.hpp>
#include <cmath>
 
namespace stan {
namespace math {
 
template <typename T1, typename T2,
          require_all_stan_scalar_t<T1, T2>* = nullptr>
inline return_type_t<T1, T2> distance(const T1& x1, const T2& x2) {
  check_finite("distance", "x1", x1);
  check_finite("distance", "x2", x2);
  return abs(x1 - x2);
}
 
template <typename T1, typename T2, require_all_vector_t<T1, T2>* = nullptr>
inline return_type_t<T1, T2> distance(const T1& x1, const T2& x2) {
  using std::sqrt;
  check_matching_sizes("distance", "x1", x1, "x2", x2);
  return sqrt(squared_distance(x1, x2));
}
 
}  // namespace math
}  // namespace stan
 
#endif