apply_scalar_unary.hpp

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#ifndef STAN_MATH_REV_FUNCTOR_APPLY_SCALAR_UNARY_HPP
#define STAN_MATH_REV_FUNCTOR_APPLY_SCALAR_UNARY_HPP
 
#include <stan/math/prim/functor/apply_scalar_unary.hpp>
#include <stan/math/rev/core/var.hpp>
 
namespace stan {
namespace math {
 
template <typename F, typename T>
struct apply_scalar_unary<
    F, T, std::enable_if_t<is_var<T>::value && is_stan_scalar<T>::value>> {
  using return_t = var;
 
  template <typename T2>
  static inline auto apply(T2&& x) {
    return F::fun(std::forward<T2>(x));
  }
};
 
template <typename F, typename T>
struct apply_scalar_unary<F, T, require_var_matrix_t<T>> {
  using return_t = plain_type_t<T>;
 
  template <typename T2>
  static inline auto apply(T2&& x) {
    return F::fun(std::forward<T2>(x));
  }
};
 
}  // namespace math
}  // namespace stan
#endif