C++ Software Debugging

C++ Software Debugging - basics

I met very interesting article about basic rules of software debugging. Article is shared from University of Cambridge. I think, everyone should get know with that article.

You can find it here:

C++ Basics of Software Debugging - University of Cambridge

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QT - foreach algoriithm with const references performance improvement

Today I would like to show you optimal way of using foreach QT algorithm . I will show you why we should pass elements of foreach algorithm by const reference instead of passing them by value. Let me explain it on the below example: Output of this example is: In point I we are creating 3 objects of MyClass class and push them to myClasses QList element. In point II we are using QT foreach algorithm to invoke getValue() method for each object from myClasses list. As you can see on output text for that part of code we are invoking copy constructor before and destructor after invoking getValue() function. It is because we are passing each myClasses list element to foreach algorithm by value. Therefore we are copying that element at the beginning of foreach loop step and removing them (destructing) at the end. This is inefficient solution, especially when class of object being copied is big. It decreases performance. of our application. Solution for that i...

Advanced C++ - Compiler generated functions

When we define some class in our C++ code, compiler is generating some important functions for our class (unless we define it explicitly). Those functions (sometimes called Compiled Generated Functions ) are: default constructor destructor copy constructor copy assignment operator During compilation, compiler knows our code and classes usage, so when we are using one of above functions implicitly, it generate that function implicitly for us in the class body. For better explenation, let's see the example below: In point (I) we are defining class TestClass . This class seems to be empty. However we are implicitly using following function in main class: point III - we are implicitly using defualt constructor in order to create instance of TestClass - default constructor of TestClass is implicitly generated by compiler point IV - we are using copy constructor of TestClass in order to copy instance to...

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