Re: C functions with shared state

[Tim Hunter <TimHunter@...>]

Jerome Vuarand wrote:
> In your Lua example, the common state is stored as an upvalue. You can
> also have upvalues in C. But you can also achieve the same effect with a
> function environment, and in your case, I think a function environment
> is more suited. 

Okay, I understand your example for using the environment, and thank you 
Mr. Vuarand very much for the code!

However, I'd like to also understand using lua_pushcclosure as well, as 
suggested by Mr. Roberts and Sr. de Figueiredo. I understand how to use 
lua_pushcclosure for a single function but how would I use it to define 
two functions that share an upvalue? Do I just push the seed value on 
the stack and then call lua_pushcclosure for "srand" and then push the 
seed value again and call lua_pushcclosure again for "rand"?

long seed = 12345;

lua_pushinteger(L, seed);
lua_pushcclosure(L, srand, 1);
lua_pushinteger(L, seed);
lua_pushcclosure(L, rand, 1);