1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOG1P_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_LOG1P_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 #include <stan/math/prim/scal/fun/log1p.hpp>
6 
7 namespace stan {
8 namespace math {
9 
10 template <typename T>
log1p(const fvar<T> & x)11 inline fvar<T> log1p(const fvar<T>& x) {
12   return fvar<T>(log1p(x.val_), x.d_ / (1 + x.val_));
13 }
14 
15 }  // namespace math
16 }  // namespace stan
17 #endif
18