Advanced C++ - Anonymous namespaces

Anonymous namespace is kind of namespace with no specified name. Such kind of namespace is visible only within file where it is defined within. I allows define variables and functions which could be visible as global, but within one file only. Thanks to that such files are not global within whole program. It also allow avoids making global static variable. Let's see an example of defining and usage of anonymous namespace. Consider following main.cpp file:
In the above example we have anonymous namespace containing one int typed variable. This variable can be used as global variable withing this main.cpp file but will not be visible inside any other files. That is simple example of usage anonymous variables. If you would like to compile it and play with it (changing or adding some parts of code to check what happends than) you can download it from here: https://github.com/xmementoit/CppAdventureExamples/tree/master/advancedCpp/anonymousNamespace

Comments

C++ Multithreading - Race conditions

In the previous C++ Multithreading article I presented you how to pass parameters between threads. Take a detail look on the output of that example once again: In the first line of that output you can notice that output text from two threads is mixed. You are probably wondering why it happens? It is because we are not protecting resources which are shared by two threads (in this example cout stream is shared in both threads) which causes multithreading's phenomenon called race condition . Because threads switching and accessing to shared resources are managed by operating system we do not know when std::cout stream will be accessed by main thread and when it will be accessed by second thread. Therefore in the previous article I mentioned that output of the example can be little different on your computer than my output example. What's more it is possible that this output will be different for few consecutive invoking of the example on the same machine. It is beca...

Advanced C++ - Stack unwinding

Stack unwinding is normally a concept of removing function entries from call stack (also known as Execution stack, Control stack, Function stack or Run-time stack). Call Stack is a stack data structure that stores active functions' addresses and helps in supporting function call/return mechanism. Every time when a function is called, an entry is made into Call stack which contains the return address of the calling function where the control needs to return after the execution of called function. This entry is called by various names like stack frame , activation frame or activation record. With respect to exception handling , stack Unwinding is a process of linearly searching function call stack to reach exception handler. When an exception occurs, if it is not handled in current function where it is thrown, the function Call Stack is unwound until the control reaches try block and then passes to catch block at the end of try block to handle exception. Also, in this proc...

Advanced C++ - Effective C++ - cheatsheet

I would like to share with you my summary of the "Effective C++" book by Scott Meyers . It is very interesting book for everyone who would like to improve C++ developments skills to be every effective. I highly recommend it. Quick summary of that book, which I prepared you can download after by clicking on below image. Summary of Effective C++ book by Damian Ziobro

Developer Adventure

Search This Blog