Question: I am collecting a number of function pointers in C++ and before I call them I want to check to see if they have been set. I really want
Question: Could you please explain what the significance of string::npos is in the statement? someString.find_first_not_of(“0123456789”)==string::npos Answer: string::npos is a constant integer that holds the maximum value of characters that a
Both C and C++ allow you to return by value aggregates, e.g., structs and unions, from a function. However, the runtime overhead of returning large objects by value can be
In many applications, you need a generic class that invokes callback functions regardless of their class type. For example, an even-driven system that needs to call a member function of
Here’s a common error: you define a class-internal type, say an enum or typedef, and then try to use it as the return type of that class’s member function: class
The standard functions isalpha(), isdigit(), isprint() etc., defined in the standard header or often fail to produce the right results because they assume that their arguments are of type ‘unsigned
The .* and ->* operators enable you to call a member function without having to know the function’s name. Remember, however, that when using these operators, you have to parenthesize
This is a useful tip if you are using SQL Server as your database and Accessas your front-end application. Use the following code to dynamically change theAccess passthrough query definition,
Question: We currently have three Exchange 5.5 SP3 servers in California. We’re going to add one server in London and use x.400 connectors, but we’re not sure what the best