inv_cloglog.hpp

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#ifndef STAN_MATH_REV_FUN_INV_CLOGLOG_HPP
#define STAN_MATH_REV_FUN_INV_CLOGLOG_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/exp.hpp>
#include <stan/math/prim/fun/inv_cloglog.hpp>
#include <cmath>
 
namespace stan {
namespace math {
 
template <typename T, require_stan_scalar_or_eigen_t<T>* = nullptr>
inline auto inv_cloglog(const var_value<T>& a) {
  auto precomp_exp = to_arena(as_array_or_scalar(exp(a.val() - exp(a.val()))));
  return make_callback_var(inv_cloglog(a.val()),
                           [a, precomp_exp](auto& vi) mutable {
                             as_array_or_scalar(a.adj())
                                 += as_array_or_scalar(vi.adj()) * precomp_exp;
                           });
}
 
}  // namespace math
}  // namespace stan
#endif