base62 for C++

base62.cpp

#include <iostream>
#include <cassert>

using namespace std;

const string CODES = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

string toBase62(int value) {
    string str;

    do {
        str.insert(0, string(1, CODES[value % 62]));
        value /= 62;
    } while (value > 0);

    return str;
}

int toBase10(string value) {
    std::reverse(value.begin(), value.end());

    int ret = 0;
    int count = 1;
    for (char& character : value) {
        ret += CODES.find(character) * count;
        count *= 62;
    }

    return ret;
}

int main() {
    assert("3bj" == toBase62(12233));
    assert(12233 == toBase10("3bj"));
    
    return 0;
}