index

Table of Contents

• The HIBF Cookbook
• All HIBF documentation snippets

The HIBF Cookbook

This document provides example recipes on how to carry out particular tasks using the HIBF functionalities in C++. Please note that these recipes are not ordered. You can use the links in the table of contents or the search function of your browser to navigate them.

It will take some time, but we hope to expand this document into containing numerous great examples. If you have suggestions for how to improve the Cookbook and/or examples you would like included, please feel free to contact us.

All HIBF documentation snippets

The following lists all snippets that appear in our documentation. Search for keywords with Strg + F.

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cstddef>    // for size_t
#include <functional> // for function
 
#include <hibf/config.hpp> // for config, insert_iterator
 
int main()
{
    auto my_input = [&](size_t const /* user_bin_id */, seqan::hibf::insert_iterator it) // fixed parameters!
    {
        it = 42; // assign something that is convertible to uint64_t
    };
 
    seqan::hibf::config config{.input_fn = my_input};
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cinttypes>  // for uint64_t
#include <cstddef>    // for size_t
#include <filesystem> // for path
#include <fstream>    // for basic_ifstream, ifstream
#include <functional> // for function
#include <string>     // for getline, string
#include <vector>     // for vector
 
#include <hibf/test/temporary_snippet_file.hpp> // for temporary_snippet_file
 
seqan::hibf::test::temporary_snippet_file file1{"file1.fa", "ACGT"};
seqan::hibf::test::temporary_snippet_file file2{"file2.fa", "ACGT"};
 
#include <hibf/config.hpp> // for config, insert_iterator
 
int main()
{
    std::vector<std::filesystem::path> filenames{file1.path(), file2.path()};
 
    auto my_input = [&](size_t const user_bin_id, seqan::hibf::insert_iterator it)
    {
        std::ifstream infile{filenames[user_bin_id]};
        std::string line;
        std::getline(infile, line); // assume there is a sequence in the first line
        // Look at https://docs.seqan.de/seqan3/3-master-user/group__io__sequence__file.html for e.g. FASTA File I/O
 
        for (size_t i = 0; i < line.size() - 1; ++i)
        {
            // compute 2-mer hashes based on the character value
            uint64_t hash = 4 * line[i] + line[i + 1];
            // You can also look at the seqan3::kmer_hash view for hashing
            // https://docs.seqan.de/seqan3/3-master-user/group__search__views.html#ga6e598d6a021868f704d39df73252974f
            it = hash;
        }
    };
 
    seqan::hibf::config config{.input_fn = my_input};
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cinttypes>  // for uint64_t
#include <cstddef>    // for size_t
#include <functional> // for function
#include <vector>     // for vector
 
#include <hibf/config.hpp> // for config, insert_iterator
 
struct dna
{
    int rank{0}; // 0 = A, C = 1, G = 2, T = 3
};
 
int main()
{
    // user_bins stores one dna sequence per user bin
    // You can look at https://docs.seqan.de/seqan3/3-master-user/group__alphabet__nucleotide.html for dna alphabets
    std::vector<std::vector<dna>> user_bins{{{0}, {0}, {0} /*AAA*/}, {{1}, {1}, {1} /*CCC*/}};
 
    auto my_input = [&](size_t const user_bin_id, seqan::hibf::insert_iterator it)
    {
        auto const & seq = user_bins[user_bin_id];
        for (size_t i = 0; i < seq.size() - 1; ++i)
        {
            // compute 2-mer hashes
            uint64_t hash = 4 * seq[i].rank + seq[i + 1].rank;
            // You can also look at the seqan3::kmer_hash view for hashing
            // https://docs.seqan.de/seqan3/3-master-user/group__search__views.html#ga6e598d6a021868f704d39df73252974f
            it = hash;
        }
    };
 
    seqan::hibf::config config{.input_fn = my_input};
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cstddef>    // for size_t
#include <functional> // for function
 
#include <hibf/config.hpp> // for config, insert_iterator
 
int main()
{
    auto my_input = [&](size_t const /* user_bin_id */, seqan::hibf::insert_iterator it) // fixed parameters!
    {
        it = 42; // assign something that is convertible to uint64_t
    };
 
    seqan::hibf::config config{.input_fn = my_input, .number_of_user_bins = 12};
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cstddef>    // for size_t
#include <functional> // for function
#include <vector>     // for vector
 
#include <hibf/config.hpp>                                // for config, insert_iterator
#include <hibf/hierarchical_interleaved_bloom_filter.hpp> // for hierarchical_interleaved_bloom_filter
 
int main()
{
    // 2 user bins:
    std::vector<std::vector<size_t>> hashes{{1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u, 10u}, {1u, 2u, 3u, 4u, 5u}};
 
    // input just passes hashes:
    auto my_input = [&](size_t const user_bin_id, seqan::hibf::insert_iterator it)
    {
        for (auto const hash : hashes[user_bin_id])
            it = hash;
    };
 
    seqan::hibf::config config{.input_fn = my_input,     // required
                               .number_of_user_bins = 2, // required
                               .number_of_hash_functions = 2,
                               .maximum_fpr = 0.05, // recommended to adapt
                               .threads = 1,        // recommended to adapt
                               .sketch_bits = 12,
                               .tmax = 0, // triggers default copmutation
                               .alpha = 1.2,
                               .max_rearrangement_ratio = 0.5,
                               .disable_estimate_union = false,
                               .disable_rearrangement = false};
 
    // construct the HIBF
    seqan::hibf::hierarchical_interleaved_bloom_filter hibf{config};
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cstddef>    // for size_t
#include <functional> // for function
#include <vector>     // for vector
 
#include <hibf/config.hpp>                                // for config, insert_iterator
#include <hibf/hierarchical_interleaved_bloom_filter.hpp> // for hierarchical_interleaved_bloom_filter
#include <hibf/misc/print.hpp>                            // for print, print_t
 
int main()
{
    // 2 user bins:
    std::vector<std::vector<size_t>> hashes{{1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u, 10u}, {1u, 2u, 3u, 4u, 5u}};
 
    // input just passes hashes:
    auto my_input = [&](size_t const user_bin_id, seqan::hibf::insert_iterator it)
    {
        for (auto const hash : hashes[user_bin_id])
            it = hash;
    };
 
    seqan::hibf::config config{.input_fn = my_input, .number_of_user_bins = 2};
 
    // construct the HIBF
    seqan::hibf::hierarchical_interleaved_bloom_filter hibf{config};
 
    // query the HIBF
    std::vector<size_t> query{1u, 2u, 3u};
    std::vector<size_t> query2{8u, 9u, 10u};
 
    auto agent = hibf.membership_agent();              // you need an agent for efficient queries
    auto & result = agent.membership_for(query, 2u);   // both user bins have hashes 1,2,3
    seqan::hibf::print(result);                        // [1,0]
    agent.sort_results();                              // Results can also be sorted
    seqan::hibf::print(result);                        // [0,1]
    auto & result2 = agent.membership_for(query2, 2u); // only user bin 0 has hashes 8,9,10
    seqan::hibf::print(result2);                       // [0]
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cinttypes> // for uint8_t
#include <cstddef>   // for size_t
#include <ranges>    // for iota_view, operator==, __fn, iota, views
#include <vector>    // for vector
 
#include <hibf/interleaved_bloom_filter.hpp> // for interleaved_bloom_filter, bin_index, bin_count, bin_size, hash_...
#include <hibf/misc/print.hpp>               // for print, print_t
 
int main()
{
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{8u},
                                              seqan::hibf::bin_size{8192u},
                                              seqan::hibf::hash_function_count{2u}};
 
    auto sequence1 = std::views::iota(0u, 20u);
    auto sequence2 = std::views::iota(10u, 30u);
    auto sequence3 = std::views::iota(25u, 35u);
 
    // Insert all values of sequence1 into bin 0
    for (auto && value : sequence1)
        ibf.emplace(value, seqan::hibf::bin_index{0u});
 
    // Insert all values of sequence2 into bin 4
    for (auto && value : sequence2)
        ibf.emplace(value, seqan::hibf::bin_index{4u});
 
    // Insert all values of sequence3 into bin 7
    for (auto && value : sequence3)
        ibf.emplace(value, seqan::hibf::bin_index{7u});
 
    auto agent = ibf.counting_agent();
 
    // Count all values of sequence1 for all bins
    auto & result = agent.bulk_count(sequence1); // Bind by `&` to avoid copies!
    seqan::hibf::print(result);                  // [20,0,0,0,10,0,0,0]
 
    // Search for specific values
    std::vector<size_t> const values{92, 1238, 812, 81273};
    seqan::hibf::print(agent.bulk_count(values));                      // [0,0,0,0,0,0,0,0]
    seqan::hibf::print(agent.bulk_count(std::views::iota(0u, 1024u))); // [20,0,0,0,20,0,0,10]
 
    // The default counters are 16 bit unsigned integer.
    // An optional template parameter can be used to specify the counter type
    auto agent2 = ibf.counting_agent<uint8_t>();
    // The returned counts are now 8 bit unsigned integers.
    seqan::hibf::print(agent2.bulk_count(sequence1)); // [20,0,0,0,10,0,0,0]
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <hibf/interleaved_bloom_filter.hpp>
 
int main()
{
    // Construct an Interleaved Bloom Filter to be used with the counting_agent.
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{43u},
                                              seqan::hibf::bin_size{8192u},
                                              seqan::hibf::hash_function_count{3}};
 
    // The counting_agent can now be constructed by calling `counting_agent` on the Interleaved Bloom Filter.
    auto agent = ibf.counting_agent();
 
    // Calling `increase_bin_number_to` invalidates the agent.
    ibf.increase_bin_number_to(seqan::hibf::bin_count{60u});
 
    // So make sure to construct a new counting_agent.
    agent = ibf.counting_agent();
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cinttypes> // for uint16_t
 
#include <hibf/interleaved_bloom_filter.hpp> // for interleaved_bloom_filter, bin_index, bin_count, bin_size
#include <hibf/misc/counting_vector.hpp>     // for counting_vector
#include <hibf/misc/print.hpp>               // for print, print_t
 
int main()
{
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{12u}, seqan::hibf::bin_size{8192u}};
    ibf.emplace(126, seqan::hibf::bin_index{0u});
    ibf.emplace(126, seqan::hibf::bin_index{3u});
    ibf.emplace(126, seqan::hibf::bin_index{9u});
    ibf.emplace(712, seqan::hibf::bin_index{3u});
    ibf.emplace(237, seqan::hibf::bin_index{9u});
 
    // The counting_vector must be at least as big as the number of bins.
    seqan::hibf::counting_vector<uint16_t> counts(12, 0);
 
    auto agent = ibf.membership_agent();
 
    counts += agent.bulk_contains(712); // `counts` contains the number of occurrences of 712 in each bin.
    seqan::hibf::print(counts);         // prints [0,0,0,1,0,0,0,0,0,0,0,0]
 
    counts += agent.bulk_contains(237); // `counts` contains the number of occurrences of 712 and 237 in each bin.
    seqan::hibf::print(counts);         // prints [0,0,0,1,0,0,0,0,0,1,0,0]
 
    counts += agent.bulk_contains(126); // `counts` contains the number of occurrences of 712, 237 and 126 in each bin.
    seqan::hibf::print(counts);         // prints [1,0,0,2,0,0,0,0,0,2,0,0]
 
    counts += counts;           // multiple counts can also be added together
    seqan::hibf::print(counts); // prints [2,0,0,4,0,0,0,0,0,4,0,0]
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <ranges> // for iota_view, operator==, _Iota, iota, views
#include <vector> // for vector
 
#include <hibf/interleaved_bloom_filter.hpp> // for bin_index, interleaved_bloom_filter, bin_count, bin_size, hash_...
#include <hibf/misc/print.hpp>               // for print, print_t
 
int main()
{
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{8u},
                                              seqan::hibf::bin_size{8192u},
                                              seqan::hibf::hash_function_count{2u}};
 
    auto sequence1 = std::views::iota(0u, 20u);
    auto sequence2 = std::views::iota(10u, 30u);
    auto sequence3 = std::views::iota(25u, 35u);
 
    // Insert all values of sequence1 into bin 0
    for (auto && value : sequence1)
        ibf.emplace(value, seqan::hibf::bin_index{0u});
 
    // Insert all values of sequence2 into bin 4
    for (auto && value : sequence2)
        ibf.emplace(value, seqan::hibf::bin_index{4u});
 
    // Insert all values of sequence3 into bin 7
    for (auto && value : sequence3)
        ibf.emplace(value, seqan::hibf::bin_index{7u});
 
    auto agent = ibf.counting_agent();
 
    // Count all values of sequence1 for all bins
    seqan::hibf::print(agent.bulk_count(sequence1)); // [20,0,0,0,10,0,0,0]
 
    // Clear bin 0
    ibf.clear(seqan::hibf::bin_index{0u});
 
    // After clearing, no values are found in bin 0
    seqan::hibf::print(agent.bulk_count(sequence1)); // [0,0,0,0,10,0,0,0]
 
    // Search for specific values
    seqan::hibf::print(agent.bulk_count(std::views::iota(0u, 1024u))); // [0,0,0,0,20,0,0,10]
 
    // Clear bin 4 and 7
    ibf.clear(std::vector{seqan::hibf::bin_index{4u}, seqan::hibf::bin_index{7u}});
 
    // After clearing, nothing is found
    seqan::hibf::print(agent.bulk_count(std::views::iota(0u, 1024u))); // [0,0,0,0,0,0,0,0]
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <hibf/interleaved_bloom_filter.hpp>
 
int main()
{
    // Construct an Interleaved Bloom Filter that contains 43 bins, each using 8192 bits, and 3 hash functions.
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{43u},
                                              seqan::hibf::bin_size{8192u},
                                              seqan::hibf::hash_function_count{3}};
 
    // Construct an Interleaved Bloom Filter that contains 43 bins, each using 256 KiBits,
    // and the default of 2 hash functions.
    seqan::hibf::interleaved_bloom_filter ibf2{seqan::hibf::bin_count{43}, seqan::hibf::bin_size{1ULL << 20}};
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <hibf/interleaved_bloom_filter.hpp>
 
int main()
{
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{12u}, seqan::hibf::bin_size{8192u}};
 
    // Insert the values `126`, `712` and `237` into bins `0`, `3` and `9` of the Interleaved Bloom Filter.
    ibf.emplace(126, seqan::hibf::bin_index{0u});
    ibf.emplace(712, seqan::hibf::bin_index{3u});
    ibf.emplace(237, seqan::hibf::bin_index{9u});
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <hibf/interleaved_bloom_filter.hpp> // for interleaved_bloom_filter, bin_index, bin_count, bin_size
#include <hibf/misc/print.hpp>               // for print, print_t
 
int main()
{
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{12u}, seqan::hibf::bin_size{8192u}};
    ibf.emplace(126, seqan::hibf::bin_index{0u});
    ibf.emplace(712, seqan::hibf::bin_index{3u});
    ibf.emplace(237, seqan::hibf::bin_index{9u});
 
    ibf.increase_bin_number_to(seqan::hibf::bin_count{18u});
    // Be sure to get the agent after `increase_bin_number_to` as it invalidates all agents!
    auto agent = ibf.membership_agent();
 
    // The content of the bins which were already present before the resize does not change
    seqan::hibf::print(agent.bulk_contains(126)); // [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
    seqan::hibf::print(agent.bulk_contains(712)); // [0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
    seqan::hibf::print(agent.bulk_contains(237)); // [0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0]
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <hibf/interleaved_bloom_filter.hpp> // for interleaved_bloom_filter, bin_index, bin_count, bin_size
#include <hibf/misc/print.hpp>               // for print, print_t
 
int main()
{
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{12u}, seqan::hibf::bin_size{8192u}};
    ibf.emplace(126, seqan::hibf::bin_index{0u});
    ibf.emplace(712, seqan::hibf::bin_index{3u});
    ibf.emplace(237, seqan::hibf::bin_index{9u});
 
    // Query the Interleaved Bloom Filter. Note that there may be false positive results!
    // A `1` at position `i` indicates the (probable) presence of the query in bin `i`.
    // Capture the result by reference to avoid copies.
    auto agent = ibf.membership_agent();
    auto & result = agent.bulk_contains(712);
    seqan::hibf::print(result); // [0,0,0,1,0,0,0,0,0,0,0,0]
 
    // Calling `increase_bin_number_to` invalidates the agent.
    ibf.increase_bin_number_to(seqan::hibf::bin_count{60u});
 
    // So make sure to construct a new membership_agent.
    agent = ibf.membership_agent();
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <hibf/interleaved_bloom_filter.hpp>
 
int main()
{
    // Construct an Interleaved Bloom Filter to be used with the membership_agent.
    seqan::hibf::interleaved_bloom_filter ibf{seqan::hibf::bin_count{43u},
                                              seqan::hibf::bin_size{8192u},
                                              seqan::hibf::hash_function_count{3}};
 
    // The membership_agent can now be constructed by calling `membership_agent` on the Interleaved Bloom Filter.
    auto agent = ibf.membership_agent();
 
    // Calling `increase_bin_number_to` invalidates the agent.
    ibf.increase_bin_number_to(seqan::hibf::bin_count{60u});
 
    // So make sure to construct a new membership_agent.
    agent = ibf.membership_agent();
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <cinttypes>  // for uint64_t, int64_t
#include <cstddef>    // for size_t
#include <functional> // for function
#include <iostream>   // for operator<<, basic_ostream, cout
#include <ranges>     // for __fn, iota, views
#include <vector>     // for vector
 
#include <hibf/config.hpp>                                // for insert_iterator, config
#include <hibf/hierarchical_interleaved_bloom_filter.hpp> // for hierarchical_interleaved_bloom_filter
 
int main()
{
    // Let's say we have groups that have data that we find interesting.
    // For example, each file of the RefSeq data set could be such a group.
    // In the context of the HIBF, we call such groups user bins.
 
    // Given a query, we want to quickly determine which user bins this query is likely to occur in.
    // This is also called Approximate Membership Query (AMQ).
 
    // In this example, we have three user bins. Each of these user bins is characterized by a range of
    // unsigned integer values. Some popular techniques for obtaining such unsigned integers from
    // biological sequences include k-mers, minimisers, and syncmers.
 
    // For clarity, we show each user bin individually before copying them to user_bin_data.
    std::vector<uint64_t> user_bin_1{1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u, 10u};
    std::vector<uint64_t> user_bin_2{1u, 2u, 3u, 4u, 5u};
    std::vector<uint64_t> user_bin_3{3u, 9u, 11u};
    std::vector<std::vector<uint64_t>> user_bin_data{user_bin_1, user_bin_2, user_bin_3};
 
    // The HIBF uses a config. There are two required options:
    // 1) The number of user bins: 3 (user_bin_data.size())
    // 2) A function to access the input data.
    //    The signature is (size_t const user_bin_id, seqan::hibf::insert_iterator it). You need to
    //    provide the function body, and the hibf lib will use this function to access the data of each
    //    user bin. When this function is called by the library with a specific user_bin_id, all
    //    unsigned integer values (data) belonging to this user bin have to be assigned to the
    //    seqan::hibf::insert_iterator.
    //    Conveniently, this function can be a lambda, and hence capture data outside the function body.
    auto get_user_bin_data = [&](size_t const user_bin_id, seqan::hibf::insert_iterator it)
    {
        for (auto value : user_bin_data[user_bin_id])
            it = value;
    };
 
    // Now we can construct a config, any other settings are optional. We have included some interesting
    // settings with their respective default values here.
    seqan::hibf::config config{.input_fn = get_user_bin_data, // required
                               .number_of_user_bins = 3u,     // required
                               .number_of_hash_functions = 2u,
                               .maximum_fpr = 0.05,
                               .threads = 1u};
 
    // The HIBF constructor will determine a hierarchical layout for the user bins and build the filter.
    seqan::hibf::hierarchical_interleaved_bloom_filter hibf{config};
 
    // Now we can search for some query.
    std::vector<uint64_t> query1{3u, 9u, 12u, 14u};
 
    // For this, we use the membership agent of the HIBF. This agent only needs to be created once and
    // can be reused for multiple subsequent queries.
    // If you are using multiple threads in your app, each thread should have its own membership agent.
    auto agent = hibf.membership_agent();
 
    // The membership_for function takes the query and a threshold. Here, a threshold of two means that
    // at least (>=) 2 values of the query must be found within a user bin to be a hit.
    // While exact thresholds can be obtained for some approaches such as k-mers, another popular
    // approach is to require at least x% of the values in the query to hit.
    // For example, a threshold of 2 equals 40% of the values in query1 (5 values).
    // This threshold needs to be provided by the user. In general, some care should be taken with the
    // threshold. A low threshold requires a traversal of more parts of the hierarchy and slows down
    // the search.
    // Note that we bind the result with a `&` to avoid copies!
    auto & result1 = agent.membership_for(query1, 2u);
 
    // query1 hits in user_bin_1 and user_bin_3, which have the IDs 0 and 2, respectively.
    for (int64_t hit_user_bin : result1)
        std::cout << hit_user_bin << ' '; // The results are not sorted: 2 0
    std::cout << '\n';
 
    // Another query.
    // A query is simply a range of unsigned integer values, e.g., it does not have to be a vector.
    auto query2 = std::views::iota(0u, 15u); // 0,1,2,...,14
    auto & result2 = agent.membership_for(query2, 5u);
    agent.sort_results(); // Sort the results.
 
    // query2 hits in user_bin_1 and user_bin_2, which have the IDs 0 and 1, respectively.
    for (int64_t hit_user_bin : result2)
        std::cout << hit_user_bin << ' '; // The results are sorted: 0 1
    std::cout << '\n';
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: BSD-3-Clause
 
int main()
{
    return 0;
}

// SPDX-FileCopyrightText: 2006-2024, Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2024, Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#include <gtest/gtest.h> // for Test, AssertionResult, TestInfo, EXPECT_TRUE, Message, TEST, TestPar...
 
#include <filesystem> // for remove
#include <fstream>    // for char_traits, operator<<, basic_ostream, ofstream
 
#include <hibf/test/sandboxed_path.hpp> // for operator/, sandboxed_path
#include <hibf/test/tmp_directory.hpp>  // for tmp_directory
 
TEST(snippet_tmp_directory, tmp_directory_)
{
    // create a directory folder
    seqan::hibf::test::tmp_directory tmp{};
 
    // Some function that should creates temporary files and removes them again
    {
        std::ofstream ofs{tmp.path() / "somefile.txt"};
        ofs << "Hello World!";
        ofs.close();
 
        std::filesystem::remove(tmp.path() / "somefile.txt");
    }
 
    // check that everything was cleanup properly
    EXPECT_TRUE(tmp.empty());
}