C++11 Archives - Page 2 of 2

Rvalue References

Before understanding about this new feature “Rvalue references” of C++11(Introduction to C++11), we should first understand what is lvalue and rvalue in C++.

Typically Lvalue is an expression which returns a permanent memory address which can be assigned to any variables. For ex:

int x = 10;
int y;
y = 20;

Here both x and y are lvalues. In some cases, we can have functions also as lvalue as shown in below example:

int x;  // global variable

// Returning reference to global variable x
int& getXRef()
{
    return x;
}

getXRef() = 30;

Now this function can act as lvalue too as shown above.

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by admin

In August 2011, a new C++ version which is known as C++11 is approved by ISO which adds a lot of new set of features to existing C++ programming language. All official documents related to these changes can be found at ISO C++ committee website.

Why C++11 ?

C++11 significantly improved the core C++ language by making several additions to its standard libraries. Major areas where C++11 is improved from its predecessor includes multithreading support, uniform initialization, generic programming support and performance.

Aims of C++11

Compatibility and Stability MUST be maintained for old code written in C++98,C++03 and in C.
Extension of core language preferably be done via standard library.
System and library design method is preferred compared to introducing new features which is useful only for specific applications.
Focus to improve type safety by providing safer methods to earlier unsafe methods.
Improve performance and better interaction with hardware to ensure better,safe and high performance embedded system programming.
Make C++ easier to teach and learn through increased uniformity, stronger guarantees, and facilities better libraries for beginners. Expert programmers can use other efficient features.

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