As with almost everything that has benefits, there are some potential downsides to exceptions as well. This article is not meant to be comprehensive, but just to point out some of the major issues that should be considered when using exceptions (or deciding whether to use them). Cleaning up resources …
Exceptions and member functions Up to this point in the tutorial, you’ve only seen exceptions used in non-member functions. However, exceptions are equally useful in member functions, and even more so in overloaded operators. Consider the following overloaded [] operator as part of a simple integer array class: int& IntArray::operator[](const …
By now, you should have a reasonable idea of how exceptions work. In this lesson, we’ll cover a few more interesting exception cases. Uncaught exceptions When a function throws an exception that it does not handle itself, it is making the assumption that a function somewhere down the call stack …
In the previous lesson on , we explained how throw, try, and catch work together to enable exception handling. In this lesson, we’ll talk about how exception handling interacts with functions. Throwing exceptions from a called function In the prior lesson, we noted, “a try block detects any exceptions that …
In the previous lesson on the need for exceptions, we talked about how using return codes causes your control flow and error flow to be intermingled, constraining both. Exceptions in C++ are implemented using three keywords that work in conjunction with each other: throw, try, and catch. Throwing exceptions We …
In the previous lesson on handling errors, we talked about ways to use assert(), std::cerr, and exit() to handle errors. However, we deferred one further topic that we will now cover: exceptions. When return codes fail When writing reusable code, error handling is a necessity. One of the most common …
This lesson and the next are optional reading for those desiring a deeper knowledge of C++ templates. Partial template specialization is not used all that often (but can be useful in specific cases). In lesson , you learned how expression parameters could be used to parameterize template classes. Let’s take …
In the previous lesson , we saw how it was possible to specialize functions in order to provide different functionality for specific data types. As it turns out, it is not only possible to specialize functions, it is also possible to specialize classes! Consider the case where you want a …
In previous lessons, you’ve learned how to use template type parameters to create functions and classes that are type independent. A template type parameter is a placeholder type that is substituted for a type passed in as an argument. However, template type parameters are not the only type of template …
In a previous chapter, we covered function templates (), which allow us to generalize functions to work with many different data types. While this is a great start down the road to generalized programming, it doesn’t solve all of our problems. Let’s take a look at an example of one …
