madness.h

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/*
 * This file is a part of TiledArray.
 * Copyright (C) 2013  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/>.
 *
 */
 
#ifndef TILEDARRAY_EXTERNAL_MADNESS_H__INCLUDED
#define TILEDARRAY_EXTERNAL_MADNESS_H__INCLUDED
 
// This needs to be defined before world/worldreduce.h and world/worlddc.h
#ifndef WORLD_INSTANTIATE_STATIC_TEMPLATES
#define WORLD_INSTANTIATE_STATIC_TEMPLATES
#endif  // WORLD_INSTANTIATE_STATIC_TEMPLATES
 
#include <memory>
 
#include <TiledArray/config.h>
 
TILEDARRAY_PRAGMA_GCC(diagnostic push)
TILEDARRAY_PRAGMA_GCC(system_header)
 
#include <madness/world/MADworld.h>
#include <madness/world/worldmem.h>
 
TILEDARRAY_PRAGMA_GCC(diagnostic pop)
 
#include <TiledArray/error.h>
 
namespace TiledArray {
// Import some MADNESS classes into TiledArray for convenience.
using madness::Future;
using madness::World;
 
// it is useful to specify the implicit execution context for the TiledArray
// DSL on a per-scope basis ... this assumes that only 1 thread (usually, main)
// parses TiledArray DSL
namespace detail {
struct default_world {
  static World& get() {
    if (!world()) {
      TA_ASSERT(madness::initialized() &&
                "TiledArray::detail::default_world::get() called "
                "before madness::initialize()");
      world() = &madness::World::get_default();
    }
    return *world();
  }
  static void set(World* w) { world() = w; }
  static World* query() { return world(); }
 
 private:
  static World*& world() {
    static World* world_ = nullptr;
    return world_;
  }
};
}  // namespace detail
 
 
inline void set_default_world(World& world) {
  return detail::default_world::set(&world);
}
inline World& get_default_world() { return detail::default_world::get(); }
inline void reset_default_world() {
  return detail::default_world::set(nullptr);
}
 
namespace {
auto world_resetter = [](World* w) { set_default_world(*w); };
}  // namespace
 
inline std::unique_ptr<World, decltype(world_resetter)> push_default_world(
    World& world) {
  World* current_world = detail::default_world::query();
  set_default_world(world);
  return std::unique_ptr<World, decltype(world_resetter)>(current_world,
                                                          world_resetter);
}
 
}  // namespace TiledArray
 
#endif  // TILEDARRAY_EXTERNAL_MADNESS_H__INCLUDED