Re: Is this valid and moral C++?
"Filimon Roukoutakis" <filimon@phys.uoa.gr> wrote in message
news:eu8bvp$68a$1@cernne03.cern.ch...
Jim Langston wrote:
"Filimon Roukoutakis" <filimon@phys.uoa.gr> wrote in message
news:eu0b95$h0k$1@cernne03.cern.ch...
Filimon Roukoutakis wrote:
Suppose that we have a function
f(Object*& obj)
and have declared a global std::vector<Object*> vec;
Is it valid to do
void g() {
vec.push_back(new Object);
f(vec.back());
}
ie does f() internally actually have read/write access to the Object
allocated in g() on the heap? If not, what would be the trick to
achieve this? Thanks,
filimon
Problem solved. The problem was that the above code produced a
segmentation violation in another part of the program. The fix was to
replace std::vector<Object*> with std::vector<Object**> and
vec.push_back(new Object*). Probably this was not obvious in the context
of the code snippet that was presented here. Thanks for the answers.
std::vector<someclass*> is usually bad design unless you are working with
polymorphism. Even then some would say use a smart pointer (although I
use naked pointers myself).
I am working with polymorphism. At some point I was reading strong
statements about not using std::smart_ptr with std::containers. Did I
misunderstand?
Probably not. There are a few people who don't like smart pointers for
various reasons.
The question becomes, then, why do you need a someclass** instead of a
class*? Unless you are changing where the pointer is pointing somewhere, in
which case wouldn't it just be better to overwrite the value?
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