unary_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
 *
 *  unary_engine.h
 *  Apr 1, 2014
 *
 */
 
#ifndef TILEDARRAY_EXPRESSIONS_UNARY_ENGINE_H__INCLUDED
#define TILEDARRAY_EXPRESSIONS_UNARY_ENGINE_H__INCLUDED
 
#include <TiledArray/dist_eval/unary_eval.h>
#include <TiledArray/expressions/expr_engine.h>
 
namespace TiledArray {
namespace expressions {
 
// Forward declarations
template <typename>
class UnaryExpr;
 
template <typename Derived>
class UnaryEngine : ExprEngine<Derived> {
 public:
  // Class hierarchy typedefs
  typedef UnaryEngine<Derived> UnaryEngine_;  
  typedef ExprEngine<Derived> ExprEngine_;    
 
  // Argument typedefs
  typedef typename EngineTrait<Derived>::argument_type
      argument_type;  
 
  // Operational typedefs
  typedef typename EngineTrait<Derived>::value_type
      value_type;  
  typedef typename EngineTrait<Derived>::op_type
      op_type;  
  typedef
      typename EngineTrait<Derived>::policy policy;  
  typedef typename EngineTrait<Derived>::dist_eval_type
      dist_eval_type;  
 
  // Meta data typedefs
  typedef typename EngineTrait<Derived>::size_type size_type;  
  typedef typename EngineTrait<Derived>::trange_type
      trange_type;  
  typedef typename EngineTrait<Derived>::shape_type shape_type;  
  typedef typename EngineTrait<Derived>::pmap_interface
      pmap_interface;  
 
  static constexpr bool consumable = true;
  static constexpr unsigned int leaves = argument_type::leaves;
 
 protected:
  // Import base class variables to this scope
  using ExprEngine_::indices_;
  using ExprEngine_::perm_;
  using ExprEngine_::permute_tiles_;
  using ExprEngine_::pmap_;
  using ExprEngine_::shape_;
  using ExprEngine_::trange_;
  using ExprEngine_::world_;
 
  argument_type arg_;  
 
 private:
  // Not allowed
  UnaryEngine(const UnaryEngine_&);
  UnaryEngine_& operator=(const UnaryEngine_&);
 
 public:
  template <typename D>
  UnaryEngine(const UnaryExpr<D>& expr) : ExprEngine_(expr), arg_(expr.arg()) {}
 
  // Pull base class functions into this class.
  using ExprEngine_::derived;
  using ExprEngine_::indices;
 
 
  void perm_indices(const BipartiteIndexList& target_indices) {
    TA_ASSERT(permute_tiles_);
 
    indices_ = target_indices;
    if (arg_.indices() != target_indices) arg_.perm_indices(target_indices);
  }
 
 
  void init_indices(const BipartiteIndexList& target_indices) {
    arg_.init_indices(target_indices);
    perm_indices(target_indices);
  }
 
  void init_indices() {
    arg_.init_indices();
    indices_ = arg_.indices();
  }
 
 
  void init_struct(const BipartiteIndexList& target_indices) {
    arg_.init_struct(ExprEngine_::indices());
    ExprEngine_::init_struct(target_indices);
  }
 
 
  void init_distribution(World* world,
                         const std::shared_ptr<pmap_interface>& pmap) {
    arg_.init_distribution(world, pmap);
    ExprEngine_::init_distribution(world, arg_.pmap());
  }
 
 
  trange_type make_trange() const { return arg_.trange(); }
 
 
  trange_type make_trange(const Permutation& perm) const {
    return perm ^ arg_.trange();
  }
 
 
  dist_eval_type make_dist_eval() const {
    typedef TiledArray::detail::UnaryEvalImpl<
        typename argument_type::dist_eval_type, typename Derived::op_type,
        typename dist_eval_type::policy>
        impl_type;
 
    // Construct left and right distributed evaluators
    const typename argument_type::dist_eval_type arg = arg_.make_dist_eval();
 
    // Construct the distributed evaluator type
    std::shared_ptr<impl_type> pimpl = std::make_shared<impl_type>(
        arg, *world_, trange_, shape_, pmap_, perm_, ExprEngine_::make_op());
 
    return dist_eval_type(pimpl);
  }
 
 
  void print(ExprOStream os, const BipartiteIndexList& target_indices) const {
    ExprEngine_::print(os, target_indices);
    os.inc();
    arg_.print(os, indices_);
    os.dec();
  }
 
};  // class UnaryEngine
 
}  // namespace expressions
}  // namespace TiledArray
 
#endif  // TILEDARRAY_EXPRESSIONS_UNARY_ENGINE_H__INCLUDED