scal_engine.h

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/*
 *  This file is a part of TiledArray.
 *  Copyright (C) 2014  Virginia Tech
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Justus Calvin
 *  Department of Chemistry, Virginia Tech
 *
 *  scal_engine.h
 *  Apr 1, 2014
 *
 */

#ifndef TILEDARRAY_EXPRESSIONS_SCAL_ENGINE_H__INCLUDED
#define TILEDARRAY_EXPRESSIONS_SCAL_ENGINE_H__INCLUDED

#include <TiledArray/expressions/unary_engine.h>
#include <TiledArray/tile_op/scal.h>
#include <TiledArray/tile_op/unary_wrapper.h>

namespace TiledArray {
  namespace expressions {

    // Forward declarations
    template <typename, typename> class ScalExpr;
    template <typename, typename, typename> class ScalEngine;


    template <typename Arg, typename Scalar, typename Result>
    struct EngineTrait<ScalEngine<Arg, Scalar, Result> > {
      // Argument typedefs
      typedef Arg argument_type; 

      // Operational typedefs
      typedef Scalar scalar_type; 
      typedef TiledArray::detail::Scal<Result,
          typename EngineTrait<Arg>::eval_type, scalar_type,
          EngineTrait<Arg>::consumable>
          op_base_type; 
      typedef TiledArray::detail::UnaryWrapper<op_base_type>
          op_type; 
      typedef typename op_type::result_type
          value_type; 
      typedef typename eval_trait<value_type>::type
          eval_type; 
      typedef typename argument_type::policy
          policy; 
      typedef TiledArray::detail::DistEval<value_type, policy>
      dist_eval_type; 

      // Meta data typedefs
      typedef typename policy::size_type size_type; 
      typedef typename policy::trange_type trange_type; 
      typedef typename policy::shape_type shape_type; 
      typedef typename policy::pmap_interface
          pmap_interface; 

      static constexpr bool consumable = true;
      static constexpr unsigned int leaves = EngineTrait<Arg>::leaves;
    };



    template <typename Arg, typename Scalar, typename Result>
    class ScalEngine : public UnaryEngine<ScalEngine<Arg, Scalar, Result> > {
    public:
      // Class hierarchy typedefs
      typedef ScalEngine<Arg, Scalar, Result> ScalEngine_; 
      typedef UnaryEngine<ScalEngine_> UnaryEngine_; 
      typedef typename UnaryEngine_::ExprEngine_ ExprEngine_; 

      // Argument typedefs
      typedef typename EngineTrait<ScalEngine_>::argument_type argument_type; 

      // Operational typedefs
      typedef typename EngineTrait<ScalEngine_>::value_type value_type; 
      typedef typename EngineTrait<ScalEngine_>::scalar_type scalar_type; 
      typedef typename EngineTrait<ScalEngine_>::op_type op_type; 
      typedef typename EngineTrait<ScalEngine_>::policy policy; 
      typedef typename EngineTrait<ScalEngine_>::dist_eval_type dist_eval_type; 

      // Meta data typedefs
      typedef typename EngineTrait<ScalEngine_>::size_type size_type; 
      typedef typename EngineTrait<ScalEngine_>::trange_type trange_type; 
      typedef typename EngineTrait<ScalEngine_>::shape_type shape_type; 
      typedef typename EngineTrait<ScalEngine_>::pmap_interface pmap_interface; 

    private:

      scalar_type factor_; 

    public:


      template <typename A, typename S>
      ScalEngine(const ScalExpr<A, S>& expr) : UnaryEngine_(expr), factor_(expr.factor()) { }


      shape_type make_shape() const {
        return UnaryEngine_::arg_.shape().scale(factor_);
      }


      shape_type make_shape(const Permutation& perm) const {
        return UnaryEngine_::arg_.shape().scale(factor_, perm);
      }


      op_type make_tile_op() const { return op_type(factor_); }


      op_type make_tile_op(const Permutation& perm) const { return op_type(perm, factor_); }


      std::string make_tag() const {
        std::stringstream ss;
        ss << "[" << factor_ << "] ";
        return ss.str();
      }

    }; // class ScalEngine


  }  // namespace expressions
} // namespace TiledArray

#endif // TILEDARRAY_EXPRESSIONS_SCAL_ENGINE_H__INCLUDED