container inside container in stl

[wolverine]

Hi
Me being a beginner in c++ , i just want to know is their
anything special i have to take care when using container inside a
container.

eg:
vector inside a map which is inside a map

When i googled i found out people saying about memory leaking. Is this
true ?
I know about issues of holding pointer inside a vector and forgetting
to delete it. I am asking for any thing else. Thanks in advance

Regards
Kiran Pradeep

[Kai-Uwe Bux]

wolverine wrote:

Hi
Me being a beginner in c++ , i just want to know is their
anything special i have to take care when using container inside a
container.

eg:
vector inside a map which is inside a map

Nope: nothing special.

>
When i googled i found out people saying about memory leaking. Is this
true ?

I do not know of any implementation of the standard library that leaks
memory. However, it is popular to use pooling allocators so that memory
allocated for containers is kept around; e.g., deleting an element in a map
may not shrink the memory use of your program but that location of memory
will be used next time, when you insert an element.

I know about issues of holding pointer inside a vector and forgetting
to delete it. I am asking for any thing else.

Huh?
Best

Kai-Uwe Bux

[Marcus Kwok]

Kai-Uwe Bux <jk********@gmx.netwrote:

wolverine wrote:

>I know about issues of holding pointer inside a vector and forgetting
to delete it. I am asking for any thing else.

Huh?

I think what the OP is saying is that he is aware of the memory leak
issue if you do something like:

std::vector<int*vip;
vip.push_back(new int(3));

but then fail to do the equivalent of:

delete vip[0];

before the vector itself is destroyed.

--
Marcus Kwok
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