log1m_exp.hpp

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#ifndef STAN_MATH_REV_FUN_LOG1M_EXP_HPP
#define STAN_MATH_REV_FUN_LOG1M_EXP_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/fun/expm1.hpp>
#include <stan/math/prim/fun/log1m_exp.hpp>
 
namespace stan {
namespace math {
 
template <typename T, require_stan_scalar_or_eigen_t<T>* = nullptr>
inline auto log1m_exp(const var_value<T>& x) {
  return make_callback_var(log1m_exp(x.val()), [x](auto& vi) mutable {
    as_array_or_scalar(x.adj())
        -= as_array_or_scalar(vi.adj()) / as_array_or_scalar(expm1(-x.val()));
  });
}
 
}  // namespace math
}  // namespace stan
#endif