trunc.hpp

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#ifndef __STAN__AGRAD__REV__TRUNC_HPP__
#define __STAN__AGRAD__REV__TRUNC_HPP__

#include <boost/math/special_functions/trunc.hpp>
#include <stan/agrad/rev/var.hpp>
#include <stan/agrad/rev/vari.hpp>

namespace stan {
  namespace agrad {

    namespace {
      // derivative 0 almost everywhere
      class trunc_vari : public vari {
      public:
        trunc_vari(vari* avi) :
          vari(boost::math::trunc(avi->val_)) { 
        }
      };
    }

    inline var trunc(const stan::agrad::var& a) {
      return var(new trunc_vari(a.vi_));
    }

  }
}
#endif