1 #ifndef STAN_MATH_REV_CORE_OPERATOR_UNARY_PLUS_HPP
2 #define STAN_MATH_REV_CORE_OPERATOR_UNARY_PLUS_HPP
5 #include <boost/math/special_functions/fpclassify.hpp>
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Independent (input) and dependent (output) variables for gradients.
const double val_
The value of this variable.
bool isnan(const stan::math::var &v)
Checks if the given number is NaN.
vari * vi_
Pointer to the implementation of this variable.
fvar< T > operator+(const fvar< T > &x1, const fvar< T > &x2)