#include "binary.h"

namespace binary {

unsigned convert(const std::string &input)
{
    unsigned result = 0;
    unsigned factor = 1;

    for (auto i = input.crbegin(); i != input.crend(); ++i) {

        switch (*i) {

        case '0':
            break;

        case '1':
            result += factor;
            break;

        default:
            return 0;
        }

        factor <<= 1;
    }

    return result;
}

}