api/html/operator__unary__plus_8hpp_source.html

 #ifndef STAN__AGRAD__REV__OPERATORS__OPERATOR_UNARY_PLUS_HPP

 #define STAN__AGRAD__REV__OPERATORS__OPERATOR_UNARY_PLUS_HPP


 #include <stan/agrad/rev/var.hpp>

 #include <boost/math/special_functions/fpclassify.hpp>

 #include <stan/agrad/rev/internal/precomp_v_vari.hpp>

 #include <stan/math/constants.hpp>


 namespace stan {

   namespace agrad {


     inline var operator+(const var& a) {

       if (unlikely(boost::math::isnan(a.vi_->val_)))

         return var(new precomp_v_vari(stan::math::NOT_A_NUMBER,

                                       a.vi_,

                                       stan::math::NOT_A_NUMBER));

       return a;

     }


   }

 }

 #endif

boost::math::isnan
bool isnan(const stan::agrad::var &v)
Checks if the given number is NaN.
Definition: boost_fpclassify.hpp:69

precomp_v_vari.hpp

stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:53

stan::agrad::vari::val_
const double val_
The value of this variable.
Definition: vari.hpp:37

stan::agrad::operator+
fvar< T > operator+(const fvar< T > &x1, const fvar< T > &x2)
Definition: operator_addition.hpp:14

stan::agrad::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:40

unlikely
#define unlikely(x)
Definition: likely.hpp:9

var.hpp

stan::agrad::precomp_v_vari
Definition: precomp_v_vari.hpp:11

stan::agrad::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:27

constants.hpp