Charles Mills wrote:
Different from C, where you use extern on both ends.
Charles
Generally speaking, C has a few models of how to do this.
One is called the "common" model - where what you say is true.
The other is called the "strict ref-def" model; where you can only
have one definition and any number of references.
Also - in the common model, you can have multiple definitions.
For example; one file might have:
struct my_struct {
int array[200];
} var;
and another might have:
long double var;
The linker simply allocates the largest amount of declared space and names
it "var" (with probably disasterous results at runtime.)
Both of these are definitions - but because they are not intiailized, it
goes
into "common" space (a name borrowed from FORTRAN.)
I prefer the strict ref-def model - one definition, many references.
But, very few
C implementations support that.
Some of the implementation details of C++ depend on the ability to do
common-like
things...
- Dave Rivers -
--
[email protected] Work: (919) 676-0847
Get your mainframe programming tools at http://www.dignus.com
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
