Solved

Returning an object from a function

Posted on 2014-01-23
2
258 Views
Last Modified: 2014-01-23
I am a bit confuse with object return in general. Am I right the copy constructor being called for the object when a function return the object.

For example,

std::string ReturnStringFunction (std::string str)
{
    std::string s = str;
    return s;
}

Now in the main program

main()
{
       std::string s1;
       std::string s2;
       s1 = ReturnStringFunction ("DummyString1");
       s1 = ReturnStringFunction ("Dummy2");
       // ??? am I protentially introduce a memory leak here?

       s2 = ReturnStringFunction ("Dummy2");
       // ??? am I introduce a different copy of "Dummy2", 2 different memory location.


}
0
Comment
Question by:tommym121
2 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 39805087
No, no memory leaks will occur in the above. The assignment operator for a 'std::string' will dispose and clean up any allocated memory before storing the new contents. 's' will be cleaned up when 'ReturnStringFunction()' exits.
And yes, "Dummy2" will be stored in two string objects, both of which will allocate the memory on the process' heap.
0
 

Author Closing Comment

by:tommym121
ID: 39805167
Thanks.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now