floor.hpp

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#ifndef STAN__AGRAD__REV__FUNCTIONS__FLOOR_HPP
#define STAN__AGRAD__REV__FUNCTIONS__FLOOR_HPP

#include <math.h>
#include <stan/agrad/rev/var.hpp>
#include <stan/agrad/rev/internal/v_vari.hpp>
#include <boost/math/special_functions/fpclassify.hpp>
#include <stan/meta/likely.hpp>

namespace stan {
  namespace agrad {

    namespace {
      class floor_vari : public op_v_vari {
      public:
        floor_vari(vari* avi) :
          op_v_vari(::floor(avi->val_),avi) {
        }
        void chain() {
          if (unlikely(boost::math::isnan(avi_->val_)))
            avi_->adj_ = std::numeric_limits<double>::quiet_NaN();
        }
      };
    }
    
    inline var floor(const var& a) {
      return var(new floor_vari(a.vi_));
    }

  }
}
#endif