String uri = "Some URI"
public int hashCode() {
    return uri.hashCode();
}

#include <boost/functional/hash.hpp>

int hashCode()
{
    boost::hash<std::string> string_hash;

    return string_hash("Hash me");
}

std::hash<std::string>()("foo");

public int hashCode()
{
       int h = hash;
       if (h == 0 && count > 0)
       {
           int off = offset;
           char val[] = value;
           int len = count;

           for (int i = 0; i < len; i++)
           {
               h = 31*h + val[off++];
           }
           hash = h;
       }
       return h;
   }

boost::hash<std::string> string_hash;

std::size_t h = string_hash("Hash me");

int  hashCode(QString text){
    int hash = 0, strlen = text.length(), i;
    QChar character;
    if (strlen == 0)
        return hash;
    for (i = 0; i < strlen; i++) {
        character = text.at(i);
        hash = (31 * hash) + (character.toAscii());
    }
    return hash;
}

int HashCode (const std::string &str) {
    int h = 0;
    for (size_t i = 0; i < str.size(); ++i)
        h = h * 31 + static_cast<int>(str[i]);
    return h;
}