Summercool wrote: > On Sep 30, 4:18 am, 7stud -- <[EMAIL PROTECTED]> wrote: >> SpringFlowers AutumnMoon wrote: >>> we have no way >>> of knowing what we pass in could get changed. >> Sure you do. You look at the function's signature. In order to use >> someone else's library, you have to know the function's signature. And >> the signature explicitly tells you whether the value you pass in could >> be changed. > > do you mean in C++? I tried to find signature in two C++ books and it > is not there. Google has a few results but it looks something like > prototype. Is signature the same as the function prototype in the .h > file? If so, don't we usually just include <___.h> and forget about > the rest. Documentation is fine although in some situation, the > descriptions is 2 lines, and notes and warnings are 4, 5 times that, > and the users' discussing it, holding different opinion is again 2, 3 > times of that length. I think in Pascal and C, we can never have an > argument modified unless we explicitly allow it, by passing in the > pointer (address) of the argument. >
You need to get more C++ books :-). You generally won't find them in basic books, but some of the more advanced ones talk about function signatures. A C++ function's signature is dependent on the function name, number of parameters being passed, and the type of each parameter. This is passed onto the linker. In any C++ program, every function signature must be unique. But in this case he's a little incorrect. You *could* look at the function's signature, but it's much easier just to look at the function's declaration. > also i think for string, it is a bit different because by default, > string is a pointer to char or the address of the first char in C and C > ++. So it is like passing in the address already. it is when the > argument n is something like 1 that makes me wonder. > > -- ================== Remove the "x" from my email address Jerry Stuckle JDS Computer Training Corp. [EMAIL PROTECTED] ================== -- http://mail.python.org/mailman/listinfo/python-list
