A question about variable-argument lists

[curiosity5374]

A function foo is defined as:
int foo(string, ...);

How to determine there are how many arguments in the list?

[Mike Smith]

cu***********@yahoo.com.cn wrote:

A function foo is defined as:
int foo(string, ...);

How to determine there are how many arguments in the list?

There is no explicit means for doing so, but it should be possible to
infer this information somehow if the function is sensibly designed.

http://cppreference.com/stdother/va_arg.html

--
Mike Smith

[Mike Wahler]

<cu***********@yahoo.com.cnwrote in message
news:6c**********************************@t1g2000p ra.googlegroups.com...

>A function foo is defined as:
int foo(string, ...);

How to determine there are how many arguments in the list?

The function needs to be told the number
and types of arguments (e.g. by the caller
via another argument). That's how 'printf()'
does it.

-Mike