inv_square.hpp

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#ifndef STAN_MATH_PRIM_FUN_INV_SQUARE_HPP
#define STAN_MATH_PRIM_FUN_INV_SQUARE_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/inv.hpp>
#include <stan/math/prim/fun/square.hpp>
#include <stan/math/prim/functor/apply_vector_unary.hpp>
 
namespace stan {
namespace math {
 
template <typename T, require_arithmetic_t<T>* = nullptr>
inline auto inv_square(T&& x) {
  return inv(square(x));
}
 
template <typename Container,
          require_not_container_st<std::is_arithmetic, Container>* = nullptr,
          require_all_not_nonscalar_prim_or_rev_kernel_expression_t<
              Container>* = nullptr,
          require_container_t<Container>* = nullptr>
inline auto inv_square(Container&& x) {
  return make_holder(
      [](auto&& v) { return inv(square(std::forward<decltype(v)>(v))); },
      std::forward<Container>(x));
}
 
template <typename Container,
          require_container_st<std::is_arithmetic, Container>* = nullptr>
inline auto inv_square(Container&& x) {
  return apply_vector_unary<Container>::apply(
      std::forward<Container>(x),
      [](auto&& v) { return v.array().square().inverse(); });
}
 
}  // namespace math
}  // namespace stan
 
#endif