expm1.hpp

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#ifndef STAN_MATH_REV_FUN_EXPM1_HPP
#define STAN_MATH_REV_FUN_EXPM1_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/fun/expm1.hpp>
 
namespace stan {
namespace math {
 
inline var expm1(const var& a) {
  return make_callback_var(expm1(a.val()), [a](auto& vi) mutable {
    a.adj() += vi.adj() * (vi.val() + 1.0);
  });
}
 
template <typename T, require_eigen_t<T>* = nullptr>
inline auto expm1(const var_value<T>& a) {
  return make_callback_var(expm1(a.val()), [a](auto& vi) mutable {
    a.adj().array() += vi.adj().array() * (vi.val().array() + 1.0);
  });
}
 
}  // namespace math
}  // namespace stan
#endif