>  i want to build a function  f: char array -> string     which just make 
> a char array into a string. But i dont want to do like this
>let f ary=

I think that's all you can do.  A char array is a proper caml array of 
chars, and chars are stored as ints outside of strings.  So, 
[|'a';'b';'c';'d'|] is 4 words long, while "abcd" is only 4 bytes long.

Chris

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