parallel-hashmap/examples/dump_load.cc

#include <iostream>
#include <string>
#include <parallel_hashmap/phmap.h>

using phmap::flat_hash_map;
using phmap::parallel_flat_hash_map;

void dump_load_uint64_uint32() {
    flat_hash_map<uint64_t, uint32_t> mp1;
    phmap::BinaryOutputArchive ar_out("./dump.data");
    // Add a new entry
    mp1[100] = 99;
    mp1[300] = 299;

    // Iterate and print keys and values 
    for (const auto& n : mp1)
        std::cout << n.first << "'s value is: " << n.second << "\n";
 
    mp1.dump(ar_out);
    flat_hash_map<uint64_t, uint32_t> mp2;
    phmap::BinaryInputArchive ar_in("./dump.data");
    mp2.load(ar_in);
    // Iterate and print keys and values g|++
    for (const auto& n : mp2) 
        std::cout << n.first << "'s value is: " << n.second << "\n";
}

void dump_load_parallel_flat_hash_map() {
    parallel_flat_hash_map<uint64_t, uint32_t> mp1;
    phmap::OutputArchiveWrapper<phmap::BinaryOutputArchive> w_out("./");

    // Add a new entry
    mp1[100] = 99;
    mp1[300] = 299;
    mp1[101] = 992;
    mp1[1300] = 2991;
    mp1[1130] = 299;
    mp1[2130] = 1299;
    // Iterate and print
    for (const auto& n : mp1)
        std::cout << "key: " << n.first << ", value: " << n.second << "\n";
 
    mp1.dump(w_out);
    parallel_flat_hash_map<uint64_t, uint32_t> mp2;
    phmap::InputArchiveWrapper<phmap::BinaryInputArchive> w_in("./");

    mp2.load(w_in);
    for (const auto& n : mp2)
        std::cout << "key: " << n.first << ", value: " << n.second << "\n";
}

int main()
{
    dump_load_uint64_uint32();
    dump_load_parallel_flat_hash_map();
    return 0;
}