wang-bin/mkid

Generate a unique integer from characters at build time. A replacement of FourCC

Generate a unique integer from characters at build time. A replacement of FourCC.

Supports 0~6 characters as parameters.

#include "mkid.h"
#include <iostream>
using namespace std;
int main()
{
    cout << "id32base64 for 'Hello': " << mkid::id32base64_5<'H','e','l','l','o'>::value << endl;
    cout << "id32base64 for 'MrWang': " << mkid::id32base36_6<'M','r','W','a','n','g'>::value << endl;
    cout << "FourCC for 'HEVC': " << mkid::fourcc<'H','E','V','C'>::value << endl;
    return 0;
}

Theorem 1

Given an integer q, any integer can be uniquely expressed as x=a0+a1*q+a2*q^2+... +ak*q^k, ai,k is in N

Thereom 2

Let K(q) be the max value let polynomial expression be a 32 bit integer, then K(256)<=3 (FourCC), K(64)<=4 (id32base64_n, n<=5) and K(36)<=5 (id32base36_n, n<=6).

Proof

Obviously