index_comparator.cpp

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// Copyright (c) 2021 MIT Digital Currency Initiative,
//                    Federal Reserve Bank of Boston
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "index_comparator.hpp"
 
#include <cstdint>
#include <cstring>
#include <leveldb/slice.h>
 
namespace cbdc::raft {
    auto index_comparator::Compare(const leveldb::Slice& a,
                                   const leveldb::Slice& b) const -> int {
        assert(a.size() == b.size());
        uint64_t a_val{0};
        uint64_t b_val{0};
        std::memcpy(&a_val, a.data(), sizeof(a_val));
        std::memcpy(&b_val, b.data(), sizeof(b_val));
        if(a_val == b_val) {
            return 0;
        }
 
        if(a_val < b_val) {
            return -1;
        }
 
        return 1;
    }
 
    auto index_comparator::Name() const -> const char* {
        return "IndexComparator";
    }
 
    void index_comparator::FindShortestSeparator(
        std::string* /* start */,
        const leveldb::Slice& /* limit */) const {}
 
    void index_comparator::FindShortSuccessor(std::string* /* key */) const {}
}