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operator_unary_plus.hpp
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1 #ifndef STAN_MATH_REV_CORE_OPERATOR_UNARY_PLUS_HPP
2 #define STAN_MATH_REV_CORE_OPERATOR_UNARY_PLUS_HPP
3
4 #include <stan/math/rev/core/var.hpp>
5 #include <stan/math/prim/scal/fun/is_nan.hpp>
6 #include <stan/math/rev/core/precomp_v_vari.hpp>
7 #include <stan/math/prim/scal/fun/constants.hpp>
8
9 namespace stan {
10 namespace math {
11
43 inline var operator+(const var& a) {
44 if (unlikely(is_nan(a.vi_->val_)))
45 return var(new precomp_v_vari(NOT_A_NUMBER,
46 a.vi_,
47 NOT_A_NUMBER));
48 return a;
49 }
50
51 }
52 }
53 #endif
precomp_v_vari.hpp
stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:55
is_nan.hpp
stan
Definition: log_sum_exp.hpp:8
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:30
stan::math::vari::val_
const double val_
The value of this variable.
Definition: vari.hpp:38
unlikely
#define unlikely(x)
Definition: likely.hpp:9
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:42
var.hpp
stan::math::operator+
fvar< T > operator+(const fvar< T > &x1, const fvar< T > &x2)
Definition: operator_addition.hpp:12
constants.hpp
stan::math::precomp_v_vari
Definition: precomp_v_vari.hpp:11
stan::math::is_nan
int is_nan(const fvar< T > &x)
Returns 1 if the input's value is NaN and 0 otherwise.
Definition: is_nan.hpp:21

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