lazy.hpp

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// Copyright (c) 2024 Simons Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0.txt
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Authors: Thomas Hahn, Alexander Hampel, Olivier Parcollet, Nils Wentzell
 
#pragma once
 
#include "./communicator.hpp"
 
#include <mpi.h>
 
namespace mpi {
 
  namespace tag {
 
    struct reduce {};
 
    struct scatter {};
 
    struct gather {};
 
  } // namespace tag
 
  template <typename Tag, typename T> struct lazy {
    T rhs;
 
    communicator c;
 
    int root{};
 
    bool all{};
 
    MPI_Op op{};
  };
 
  template <typename T> inline constexpr bool is_mpi_lazy = false;
 
  template <typename Tag, typename T> inline constexpr bool is_mpi_lazy<lazy<Tag, T>> = true;
 
} // namespace mpi