Tag: std::move

C++11

std::move explained with simple example

adminby admin

std::move is a C++11(Introduction to C++11) utility function which is used to convert an lvalue to rvalue expression to forcefully call the move constructor or move assignment operator which will improve the program’s performance drastically. This utility function is only change lvalue into rvalue expression that’s it. This function doesn’t do any kind of memory movement.

Implementation of this function is as follows:

From C++11 onwards:

template< class T >
typename std::remove_reference<T>::type&& move( T&& t );

From C++14 onwards:

template< class T >
constexpr typename std::remove_reference<T>::type&& move( T&& t );

Let’s take an example of usage of this move function:

(more…)
std::move explained with simple example Read More
C++11

Move Constructors explained with simple example

adminby admin


In C++11 (Introduction to C++11) , move constructors are added which can improve any code’s performance drastically. Typically a move constructor is same as copy constructor which will create a new instance based on the passed object. But, the idea behind move constructor is to avoid memory reallocation and use as many memory from the passed original object because the original object is about to be deleted as it has been provided as a temporary object.

Since, in move constructors we avoid memory reallocation while creating new instance while will improve the code’s performance as we know memory allocation is quite costly.
While implementing move constructors we need to take care of one important point to ensure that the original object can be correctly destroyed.

Let’s take an example to see how this memory reallocation is avoided in case of move constructor.

(more…)

Move Constructors explained with simple example Read More
C++11

Introduction to C++11

adminby 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

  1.  Compatibility and Stability MUST be maintained for old code written in C++98,C++03 and in C.
  2.  Extension of core language preferably be done via standard library.
  3.  System and library design method is preferred compared to introducing new features which is useful only for specific applications.
  4.  Focus to improve type safety by providing safer methods to earlier unsafe methods.
  5.  Improve performance and better interaction with hardware to ensure better,safe and high performance embedded system programming.
  6.  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.
(more…)
Introduction to C++11 Read More