Is there a substantial advantage to passing a std::list into a function by reference instead of by value? Or is the base list class pretty small regardless of the number of values? e.g.:
is the call to foo() any more expensive than the call to bar()?
One more question while I'm on the topic of std::list, does the insertion functions (push_front, push_back, insert) copy the object or just store a pointer to it? i.e. will the following work, or will I be referencing deallocated memory if I try to access the first element of l after I return from foo()?
If the above code doesn't work, I'm assuming the solution is to do this:
thanks a bunch. I haven't done much with STL lately and my memory is a bit rusty.
--sam

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C++

Dev C++ I Can't Pass By Reference Page

Auto tune download for windows xp free. Passing parameters by references in C - We have discussed how we implement call by reference concept using pointers. Here is another example of call by reference which makes use of C reference −.

C++ Pass By Reference Object

P: n/a
I've read that C allows two ways to pass information between
functions:
o Pass by Value
o Pass by Reference
I was talking to some C programmers and they told me there is no such
thing as pass by reference in C since you are just passing an address
(or a pointer value address I guess?). So I was wondering is this
correct?
Also I read that, 'C does not have run-time typing'. What does this
mean and is it true?
C just cares that you pass the correct type of arguments (int, float,
char, ..) and doesn't care about the value or variable/data structure
name is that also correct?
I wrote 3 simple test programs for the different ways to pass
information in functions. Any critiques/improvements would be welcome:
/* Example 1 */
/* func.c */
int swap(int a, int b)
{
a = b;
return a;
}
/* main.c */
int b =1;
int c = 2;
int main(void)
{
swap(b,c);
printf('%d',c);
return 0;
}
BTW in my example of func.c and main.c here it doesn't seem to matter
if I make b, c global variables or local. In writing C how do I best
decide if I should make variables global or local, or if it won't
affect the purpose of the code should I not care?
/* Example 2 */
/* func2.c */
int swap(int &a, int &b)
{
a = b;
return a;
}
/* main2.c */
int *b =1;
int *c = 2;
int main(void)
{
swap(&b,&c);
printf('%d',&c);
return 0;
}
/* Example 3 */
/* func3.c */
int swap(int *a, int *b)
{
*a = *b;
return *a;
}
/* main3.c */
int *b =1;
int *c = 2;
int main(void)
{
swap(*b,*c);
printf('%d',&c);
return 0;
}
PS: I'm learning about closures in Lisp and they seem nifty, but I
read C doesn't have them. Or is this not quite true?
Lisp 9000
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