Windows registry performance in multithreading

Submitted by Serguei_Tarassov on Sat, 19/01/2019 - 15:44

The Windows registry (WR) is a NoSQL DBMS based on a semi-structured hierarchical data model. Unlike configuration files approach, WR:

Testing

C++ |
NoSQL

C++11 containers: move semantic vs pointers

Submitted by Serguei_Tarassov on Thu, 22/11/2018 - 13:34

Motivation

C++11 has introduced the move semantic which can also be used in containers instead of "old-school" pointers. The specific containers owning objects has been proposed earlier by third-party libraries like Boost (for example, ptr_map or ptr_vector).

Testing

C++ |
STL

C/C++: how to clear a linked circular list

Submitted by Serguei_Tarassov on Mon, 12/11/2018 - 15:25

In a linked circular list you need to add some checks to avoid memory corruption.

Full example (compiled OK with GCC 8.x)

Read/write performance: single thread vs multithread

Submitted by Serguei_Tarassov on Mon, 18/06/2018 - 16:14

The small test program shows how I/O operations (memory and file) can be accelerated using multiple threads.

Testing

C++ |
Multithreading

C++Builder: using variant type variable to store Delphi interface

Submitted by Serguei_Tarassov on Sat, 28/10/2017 - 19:27

Delphi case

Delphi supports interfaces natively. Any variable of variant type can store an interface like any allowed data types.

C++Builder |
C++

C++Builder: classic compiler vs clang

Submitted by Serguei_Tarassov on Mon, 24/07/2017 - 20:30

Pro et contra

I use C++Builder 10.1 (Berlin) that proposes both 'classic' bcc32 compiler and new clang bcc32c. Whether do you rather to use classic compiler or to switch to clang? The answer is not quite simple.

The advantages of new clang compiler:

Using Delphi library with C++ Builder

Submitted by Serguei_Tarassov on Thu, 29/09/2016 - 12:23

Since early XE versions C++ Builder supports Delphi units directly added in C++ project and compiles them as well as C/C++ source. However, this approach has several drawbacks:

Programming

C++ |
C++Builder

Happy tickets benchmark

Submitted by Serguei_Tarassov on Sat, 13/02/2016 - 10:49

Some countries have integer numbers printed on the transport tickets, for example, in ex-USSR. The ticket is "happy" when the sum of the first half of digits equals to the second one. Then you should eat it and make a wish.

Example:

123456 and 111222 are not happy tickets
123123 and 123222 are the happy tickets

Testing

Interface implementations and multiple inheritance in C++

Submitted by Serguei_Tarassov on Sat, 30/05/2015 - 12:02

Multiple inheritance of interfaces which are pure abstract classes indeed is not a problem until you need to use the interface implementation in other classes.

Suppose there are two interfaces, the implementation of which will be used in other classes.

Programming

DateTime in C++

Submitted by Serguei_Tarassov on Sat, 04/12/2010 - 13:48

Many years ago we had a need to manipulate the data of types "date" and "time" (DateTime in C# and Delphi/C++Builder). I had developed the corresponding class for these purposes.

Here is the interface with comments:

Programming

Motivation

Delphi case

Pro et contra

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