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

• can manage millions of keys and values
• is thread-safe
• is an in-memory database
• supports some data types
• supports a secure access to keys and values
• has GUI (regedit) and command …

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).

The goal of the test is to compare the speed of manipulations …

In the case of linked circular list you need to add some checks to avoid memory corruption.

Full example (compiled OK with GCC 8.x)

#include <iostream>
#include <cstdlib>

struct Node
{
    Node(Node* prev, int val)
        : prev(prev), next(NULL), value(val)
    { }
    Node *prev, *next;
    int value;
};

void clear_list(Node …

In the case of linked circular list you need to add some checks to avoid memory corruption.

Full example (compiled OK with GCC 8.x)

#include <iostream>
#include <cstdlib>

struct Node
{
    Node(Node* prev, int val)
        : prev(prev), next(NULL), value(val)
    { }
    Node *prev, *next;
    int value;
};

void clear_list(Node …

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

Scenario

The program uses

• N threads (1 means a single thread)
• X bytes of memory to allocate a huge block (255 MB by default)
• M files to dump some huge memory block …

Delphi case

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

program IntfDelphi;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  Classes, SysUtils, Variants;

type
  ITest = interface(IInterface)
    ['{BEDC5E17-2C40-4F7C-8C78-34448F5CE146}']
    procedure Foo(const Msg: string);
  end;

  TestImpl = class(TInterfacedObject, ITest)
  public
    procedure Foo(const Msg …

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:

• more of C++11 language …

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:

• Usually, Delphi files are stored in separated folders of other applications and packages. So your C++ project will point to many …

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 …

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 …