The type of the most derived object to which an expression refers is said to be the dynamic type of that expression. For example, if p is declared as a pointer to class B and it’s actually pointing to an object of class D (when D is derived from B),
Another useful STL algorithm is replace(), which is defined in the standard header and has the following prototype: void replace (ForwardIterator start, ForwardIterator end, const T & old_value, const T & new_value); The first and the second arguments mark the sequence’s beginning and end, respectively. replace() changes every occurrence of
A value of type bool can be converted implicitly to a value of type int, with false becoming zero, and true becoming one. For example: bool b = false; int n = b; // n equals 0 b = true; double f = b; // f equals 1.0 Likewise, an
The classic implementation of the swap algorithm looks like this: void swap (int & i, int & j) { int temp = i; i = j; j = temp; } Is it possible to swap i and j without using a third variable? Yes it is: swap(int & i, int
On 32-bit platforms, int and long usually occupy the same size. Programmers use these types interchangeably when they need a 32-bit integer. However, on 64-bit architectures, long is often represented as a 64-bit integer, whereas int occupies 32 bits. In the next few years, many platforms and processors will switch
Merging two lists isn’t only a popular homework assignment; rather, this task is sometimes needed in real world programming as well. Fortunately, you don’t have to reinvent the wheel anymore. STL’s list defines the member function merge(), which takes a second list as an argument and merges it into the
Question: I have a datawindow with a few columns. I have written a menu through which I can sort the existing data alphabetically or by value. Whenever a new row is inserted, or an existing row is changed, I want the sorting to take place automatically. I do not want
Question: I’m looking for an “SQL builder” component that I can plug into a VB application that is end-user-friendly. Essentially, I would like the component to allow users to use a graphical interface that represents the tables/views of an Informix DB with the output being a SQL statement. The resulting
Question: How can I give the user the option to print only one page in a Visual FoxPro report? Answer: The REPORT FORM command has a RANGE parameter. Here is information from the help file: RANGE nStartPage [, nEndPage]Specifies a range of pages to print. nStartPage specifies the first page