stream_filter.h

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/*
 * Copyright 2018 Universidad Carlos III de Madrid
 * 
 * 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
 * 
 * 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.
 */
#ifndef GRPPI_STREAM_FILTER_H
#define GRPPI_STREAM_FILTER_H
 
#include "common/patterns.h"
 
namespace grppi {
 
template <typename Predicate>
auto keep(Predicate && predicate_op)
{
  return filter_t<Predicate>{std::forward<Predicate>(predicate_op)};
}
 
template <typename Predicate>
auto discard(Predicate && predicate_op)
{
  return keep([&](auto val) { return !predicate_op(val); });
}
 
}
 
#endif