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operator_unary_increment.hpp
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1 #ifndef STAN_MATH_REV_CORE_OPERATOR_UNARY_INCREMENT_HPP
2 #define STAN_MATH_REV_CORE_OPERATOR_UNARY_INCREMENT_HPP
3
4 #include <stan/math/rev/core/var.hpp>
5 #include <stan/math/rev/core/v_vari.hpp>
6 #include <boost/math/special_functions/fpclassify.hpp>
7 #include <limits>
8
9 namespace stan {
10 namespace math {
11
12 namespace {
13 class increment_vari : public op_v_vari {
14 public:
15 explicit increment_vari(vari* avi) :
16 op_v_vari(avi->val_ + 1.0, avi) {
17 }
18 void chain() {
19 if (unlikely(boost::math::isnan(avi_->val_)))
20 avi_->adj_ = std::numeric_limits<double>::quiet_NaN();
21 else
22 avi_->adj_ += adj_;
23 }
24 };
25 }
26
36 inline var& operator++(var& a) {
37 a.vi_ = new increment_vari(a.vi_);
38 return a;
39 }
40
52 inline var operator++(var& a, int /*dummy*/) {
53 var temp(a);
54 a.vi_ = new increment_vari(a.vi_);
55 return temp;
56 }
57
58 }
59 }
60 #endif
stan::math::operator++
var & operator++(var &a)
Prefix increment operator for variables (C++).
Definition: operator_unary_increment.hpp:36
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
boost::math::isnan
bool isnan(const stan::math::var &v)
Checks if the given number is NaN.
Definition: boost_isnan.hpp:22
unlikely
#define unlikely(x)
Definition: likely.hpp:9
v_vari.hpp
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44
var.hpp

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