https://github.com/wang-bin/mkid

Generate a unique integer from characters at build time. A replacement of FourCC
https://github.com/wang-bin/mkid

Last synced: 3 months ago
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Generate a unique integer from characters at build time. A replacement of FourCC

• Host: GitHub
• URL: https://github.com/wang-bin/mkid
• Owner: wang-bin
• Created: 2013-11-01T10:51:15.000Z (over 12 years ago)
• Default Branch: master
• Last Pushed: 2014-12-08T15:59:50.000Z (over 11 years ago)
• Last Synced: 2025-02-26T15:45:49.087Z (over 1 year ago)
• Language: C++
• Homepage:
• Size: 137 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

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

Supports 0~6 characters as parameters.

    #include "mkid.h"

    #include 

    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