tuple_a_not_b.hpp

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * to you 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
 *
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 */
 
#ifndef TUPLE_A_NOT_B_HPP_
#define TUPLE_A_NOT_B_HPP_
 
#include "tuple_sketch.hpp"
#include "theta_set_difference_base.hpp"
 
namespace datasketches {

template<
  typename Summary,
  typename Allocator = std::allocator<Summary>
>
class tuple_a_not_b {
public:
  using Entry = std::pair<uint64_t, Summary>;
  using ExtractKey = pair_extract_key<uint64_t, Summary>;
  using CompactSketch = compact_tuple_sketch<Summary, Allocator>;
  using AllocEntry = typename std::allocator_traits<Allocator>::template rebind_alloc<Entry>;
  using State = theta_set_difference_base<Entry, ExtractKey, CompactSketch, AllocEntry>;

  explicit tuple_a_not_b(uint64_t seed = DEFAULT_SEED, const Allocator& allocator = Allocator());

  template<typename FwdSketch, typename Sketch>
  CompactSketch compute(FwdSketch&& a, const Sketch& b, bool ordered = true) const;
 
private:
  State state_;
};
 
} /* namespace datasketches */
 
#include "tuple_a_not_b_impl.hpp"
 
#endif