Re: Why doesn't the class/object keep its internal data properly when returned from function?

From:
"Victor Bazarov" <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Mon, 28 Apr 2008 12:10:37 -0400
Message-ID:
<fv4stt$ihh$1@news.datemas.de>
Rob wrote:

I have a vector of a class type and when I create an object inside a
function and return that and add it to the vector, it doesn't properly
keep the data inside it.


What do you mean?

So I have a few questions:

1. Is this because it loses scope since it wasn't created with "new"?


No.

2. If I do create it with new, but the vector holds objects not
pointers, will the vector's "delete" operator function still handle
deleting all those pointers?


No.

CODE 1:

//Doing without "new"

SomeClass create(string name)
{
    return SomeClass( name );
}

int main()
{
    std::vector<SomeClass> p;
    p.push_back( create( "Fred" ) );
}

CODE 2:

//Doing with "new"

SomeClass create(string name)
{
    return *( new SomeClass( name ) );
}

int main()
{
    //Will calling "delete p" also delete all the pointers created
for the data it holds?


No.

    std::vector<SomeClass> p;
    p.push_back( create( "Fred" ) );
}


V
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