The auto_ptr class template respects polymorphism and destroys derived objects of base pointers properly. In the following program, an auto_ptr is actually bound to a B * pointer, where B
A function call such as the following: classname::funcname(); is a qualified call. Qualified disambiguate function names. They are needed, for instance, in a class that inherits from several base classes,
Here’s a very common error. You define a class but forgot to add a semicolon after the closing }. For example: class Mylist{public: Mylist(); ~Mylist(); //..more member functions} // missing
Because static class members are not associated with a particular object of their class, you can access them even if you haven’t instantiated any object. In the following example, the
The escape sequence ‘a’ is the ASCII code for a beep. To emit a beep from your program, output this escape sequence to the standard output. For example: const char
C++ defines four possible forms for a class’s copy constructor. For a class called X, a copy constructor can have one of the following forms: X(X&);X(const X&);X(volatile X&);X(const volatile X&);
Technically speaking, constructors have no name. This may seem strange at first because you define a constructor for class X as X::X(). However, this construct is not the name of
A reader asked me the following questions: “Can a function that returns something, throw a exception and still return a value?” Lets’ look at a concrete example: int f(){ if
This class can help in simplifying most of the validation chores in your UI-intensive apps. The class “wraps” around a TextBox control and traps most of its events, to automatically
Introduction In this article I’ll move away from COM security to provide an overview about that vast subject generally referred as “Internet security”. As you will see, providing an effective
‘ evaluate the transposed matrix” a transposed matrix is the array you get when’ you “rotate” a bi-dimensional arrayFunction TransposeMatrix(arr() As Double) As Double() Dim startRow As Long, startCol As
Option Explicit’ Evalutate the 16-bit CRC (Cyclic Redundancy Checksum) of an array of bytes” If you omit the second argument, the entire array is consideredFunction Crc16(cp() As Byte, Optional ByVal
‘ VBA’s intrinsic Rnd function returns numbers evenly’ distributed between 0 and 1. Each number in that’ interval has equal probability of being returned’ for any given function call.’ This
‘ Converts a decimal value into fractional parts as integers’ (based on the concept of Continued Fractions)’ Examples of usage:’ Call DeclToFrac(0.125, a, b) ‘ 1 and 8 are returned
The following technique will allow you to free your tablespaces from Oracle Related Posts Brocade Expands The Effortless Network Strategy with New Campus LAN InnovationsNeuralink prepares for second human trialRevolutionizing
In Visual Basic, it is not possible to measure time with more precision than one second. This code allows the user to measure time passed in increments less than one
The method shown below returns as a String the complete path to the current (working) directory. This can be useful to know because default files(including property files) are read from
While designing a database in Access 2000 recently, I decided the most intuitive way for my users to be able to look at the data they wanted was to let
Private Declare Sub keybd_event Lib “user32” (ByVal bVk As Byte, _ ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)Private Const VK_LWIN = &H5BPrivate Const KEYEVENTF_KEYUP =
Like many high-level, abstract, and portable concepts, EJB spec has itsdownsides. One of them is the very generality that makes beans so portable.Interfaces javax.ejb.EntityBean and javax.ejb.SessionBean declare quite a few
In the coming Visual Studio 7, it is possible to create constructors in VB. One of the great benefits of using constructors is that they make it possible to control
When you pass a read-writable property directly as a ByRef parameter to a function or subroutine, the property will not be changed. This is because in VB 6.0 or previous
Trying to pass an ActiveX control as a parameter to a method on an external ActiveX DLL (or EXE), garners a Related Posts How to Declare a Pattern in JavaElon
The duration of a timed task in seconds can be determined by the DateDiff function. To present the result in a user friendly format, pass the DateDiff result to this
The NowCombo control is a multi-columns ComboBox that expands on the DBCombo control. You can use it to select and copy an item from another table in the database. For
By taking advantage of the functionality of two Microsoft Message Queuing libraries, you can minimize the time it takes to create MSMQ objects during testing or deployment of your messaging
Private Type RECT Left As Long Top As Long Right As Long Bottom As LongEnd TypePrivate Declare Function IsWindow Lib “user32” (ByVal hWnd As Long) As LongPrivate Declare Function GetClientRect
‘ Returns a collection with the names of all the files’ that match a file specification” The file specification can include wildcards; multiple’ specifications can be provided, using a semicolon-delimited’
‘ list all the files in a directory’ if NESTEDDIRS = True it lists a whole directory tree” returns a 1-based array containing all the listed filesFunction ListFiles(ByVal Path As
‘ create a nested directory” it’s similar to MkDir, but it also creates’ all intermediary sub-directoriesSub MakePath(ByVal path As String) Dim i As Integer, ercode As Long On Error Resume