C++: A Dialog Programming with the C++ Standard Library

The Functions of the HomeUtility namespace

Now that we've covered that new construct, let's take a look at the functions declared in the HomeUtility namespace, starting with ReadDoubleFromLine, which is shown in Figure 13.10.

Figure 13.10. HomeUtility::ReadDoubleFromLine (from code\hmutil1.cpp)

bool HomeUtility::ReadDoubleFromLine(istream& is, double& Result) { double temp; xstring garbage; is >> Result; return CheckNumericInput(is); }

This function isn't terribly complicated. It uses the standard library input operator >> to read the data from an input stream into a double called Result, calls a function named CheckNumericInput (shown in Figure 13.15 on page 931), and returns the result of that function to the user.

However, there is one ...