How can I hash a string to an int using c++?

Question

I have to write my own hash function. If I wanted to just make the simple hash function that maps each letter in the string to a numerical value (i.e. a=1, b=2, c=3, ...), i

Answer 1

#include 
#include 
#include 

using namespace std;

// a variation on dan bernstein's algorithm
// [http://www.cse.yorku.ca/~oz/hash.html]
template
struct hash {
    hash() : acc(5381) { }
    template
    void operator()(Ch ch) { acc = ((acc << 5) + acc) ^ ch; }
    operator Int() const { return acc; }
    Int acc;
};

int main(int argc, char* argv[])
{
    string s("Hellp, world");
    cout << hex << showbase
        << for_each(s.begin(), s.end(), hash()) << '\n';
    return 0;
}