[a1369209993]

Hmm, some further improvements:

  typedef float F;typedef int I;
  // saves 2 lines (but zero bytes)
  
  #define R return
  // OR
  #define O(S,A,R) operator S(A){return R;}
  
  #define E(F){E_((F||cudaPeekAtLastError)(),__FILE__,__LINE__);}

and so on - although you'd probably have to make semantic chages to get onto a single card. (Or use a smaller font, but that's presumably cheating.)

[sp332]

I feel like the self-timing and error-checking is unnecessary, and you can at least fit it on the front + back of a business card with enough room left for your name and an email address.