Re: [Dev-C++] Three dots in function prototypes

[Per W. <pw...@ia...>]

A variable number of parameters.

The most common use is the printf() class of functions, where the
parameter immediately before the ellipsis (the three dots) is a formatting
string, specifying how many parameters that will follow, and of what
type they are.

However, you might write your own functions doing just about anything. An
example:

int int_sum(int count,...);
void vec_add(Vec& res,int count,...);

However, the use of an ellipsis is most useful when the individual "extra"
parameters have varying types, since the above two examples could have
been modified to have two parameters - a count and an array of
integer or Vec items.

The functions need to use the macros va_start(), va_arg(), and va_end() to
walk through the extra parameters. However, the function never know how
many parameters and of what type it has received. It is completely up to
he caller to adhere to expected behaviour.

/Per W

On Sat, 28 Aug 2004 ab...@el... wrote:

> Dear users,
>
>    Reading the function prototypes in, for example, wchar.h, I saw the
> following line:
>
>    int	wprintf (const wchar_t*, ...);
>
>    Anybody knows what is the meaning of theese three dots?
>
> Regards
> Andre Barros
>
>
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