rand.cpp

#include "rand.hpp"

#include <string>
#include <cstring>
#include <sstream>

int generate_random_num()
{
    static std::random_device rd;
    static std::mt19937 gen(rd());
    static std::uniform_int_distribution<> dis(std::numeric_limits<int>::min(), std::numeric_limits<int>::max());
    return dis(gen);
}

auto gen_rand_str(std::size_t len) -> std::string {
    static constexpr auto chars =
        "0123456789"
        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
        "abcdefghijklmnopqrstuvwxyz"
        "!@#$^&*(){}[]|";
    thread_local auto rng = random_generator<>();
    auto dist = std::uniform_int_distribution{{}, std::strlen(chars) - 1};
    auto result = std::string(len, '\0');
    std::generate_n(begin(result), len, [&]() { return chars[dist(rng)]; });
    return result;
}