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Request for inclusion of Boost.MultiIndex #2

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joaquintides opened this issue Feb 27, 2019 · 1 comment
Closed

Request for inclusion of Boost.MultiIndex #2

joaquintides opened this issue Feb 27, 2019 · 1 comment
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enhancement New feature or request

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@joaquintides
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I'd very much like to see Boost.MultiIndex included in this benchmark. As it happens, the library provides a set-like interface rather than that of a map, but the latter can easily be emulated as follows:

#pragma once

#include "Hash.h"
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/member.hpp>
#include <utility>

static const char* MapName = "boost::multi_index::hashed_unique";

template <class T1, class T2>
struct MapElement
{
    using first_type = T1;
    using second_type = T2;
    
    template<class Q1>
    MapElement(Q1&& first):
        first{std::forward<Q1>(first)},
        second{}
        {}

    template<class Q1, class Q2>
    MapElement(Q1&& first, Q2&& second):
        first{std::forward<Q1>(first)},
        second{std::forward<Q2>(second)}
        {}
    
    T1         first;
    mutable T2 second;
};

template <class Key, class Val>
using MapBase = boost::multi_index_container<
    MapElement<Key, Val>,
    boost::multi_index::indexed_by<
        boost::multi_index::hashed_unique<
            boost::multi_index::member<
                MapElement<Key, Val>, Key, &MapElement<Key, Val>::first
            >,
            Hash<Key>
        >
    >
>;

template <class Key, class Val>
struct Map: MapBase<Key, Val>
{
  using super = MapBase<Key, Val>;
  using super::super;
  
  template <class K>
  Val& operator[](K&& key){
      return this->emplace(std::forward<K>(key)).first->second; 
  }
};
@martinus martinus self-assigned this Mar 1, 2019
@martinus martinus added the enhancement New feature or request label Mar 1, 2019
@martinus
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martinus commented Mar 1, 2019

Thanks for this! I've added it to the benchmark in comit f97c368

@martinus martinus closed this as completed Mar 1, 2019
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