generate.cpp

#include "modules/generate.h"
#include <iostream>
#include <random>

std::string generatealg::Generate(size_t length)
{
    static const std::string allowed_chars{"123456789BCDFGHJKLMNPQRSTVWXZbcdfghjklmnpqrstvwxz"};

    static thread_local std::default_random_engine randomEngine(std::random_device{}());
    static thread_local std::uniform_int_distribution<int> randomDistribution(0, allowed_chars.size() - 1);

    std::string id(length ? length : 32, '\0');

    for (std::string::value_type &c : id)
    {
        c = allowed_chars[randomDistribution(randomEngine)];
    }

    return id;
}

std::string generatealg::GenerateMode(std::string::size_type length)
{
    static auto &chrs = "0123456789"
                        "abcdefghijklmnopqrstuvwxyz"
                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    thread_local static std::mt19937 rg{std::random_device{}()};
    thread_local static std::uniform_int_distribution<std::string::size_type> pick(0, sizeof(chrs) - 2);

    std::string s;

    s.reserve(length);

    while (length--)
        s += chrs[pick(rg)];
    return s;
}

std::string generatealg::GenerateMode1(std::size_t length)
{
    const std::string CHARACTERS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    std::random_device random_device;
    std::mt19937 generator(random_device());
    std::uniform_int_distribution<> distribution(0, CHARACTERS.size() - 1);

    std::string random_string;

    for (std::size_t i = 0; i < length; ++i)
    {
        random_string += CHARACTERS[distribution(generator)];
    }

    return random_string;
}