What are the best practices for exception handling?

9 Best Practices to Handle Exceptions in Java

1. Clean Up Resources in a Finally Block or Use a Try-With-Resource Statement.
2. Prefer Specific Exceptions.
3. Document the Exceptions You Specify.
4. Throw Exceptions With Descriptive Messages.
5. Catch the Most Specific Exception First.
6. Don’t Catch Throwable.
7. Don’t Ignore Exceptions.

Should you use exceptions in C++?

Exceptions are preferred in modern C++ for the following reasons: An exception forces calling code to recognize an error condition and handle it. Unhandled exceptions stop program execution. An exception jumps to the point in the call stack that can handle the error.

How do you handle exceptions in C++?

C++ exception handling is built upon three keywords: try, catch, and throw. throw − A program throws an exception when a problem shows up. This is done using a throw keyword. catch − A program catches an exception with an exception handler at the place in a program where you want to handle the problem.

What is wrong with C++ exceptions?

The main reason C++ exceptions are so often forbidden is that it’s very hard to write exception safe C++ code. Exception safety is not a term you hear very often, but basically means code that doesn’t screw itself up too badly if the stack is unwound.

Which guidelines must follow while writing exceptions?

Exception handling guidelines

• Don’t catch Exception unless that’s all you’re having thrown to you.
• Don’t declare that you throw Exception ever.
• Both rules #1 and #2 apply to RuntimeException as well.
• Don’t catch Throwable if you want to continue breathing.
• Rule #4 applies to Error and any subclasses of Error as well.

When should you use exception handling?

Use exception handling if the event doesn’t occur very often, that is, if the event is truly exceptional and indicates an error (such as an unexpected end-of-file). When you use exception handling, less code is executed in normal conditions.

When should we use exception handling?

Exceptions should be used for situation where a certain method or function could not execute normally. For example, when it encounters broken input or when a resource (e.g. a file) is unavailable. Use exceptions to signal the caller that you faced an error which you are unwilling or unable to handle.

How can we restrict a function to throw certain exceptions?

How one can restrict a function to throw particular exceptions only? Explanation: We can use throw clause to mention the exceptions that a function can throw. Hence restricting the function to throw some particular exceptions only.

What should be put in a try block in C++?

What should be put in a try block? Explanation: The statements which may cause problems are put in try block. Also, the statements which should not be executed after a problem accursed, are put in try block. Note that once an exception is caught, the control goes to the next line after the catch block.

What are the best practices for handling and creating exceptions?

This section describes best practices for handling and creating exceptions. Use try / catch blocks around code that can potentially generate an exception and your code can recover from that exception. In catch blocks, always order exceptions from the most derived to the least derived. All exceptions derive from Exception.

Are there any tutorials available on exception handling in C++?

There are numerous tutorials available online on exception handling in C++. But few explains what you should not do & intricacies around it. So here I am to bridge the gap & show you some intricacies, from where & why you should not throw an exception and C++ exception handling best practices.

Should we use exception specifications in C++11?

However, exception specifications proved problematic in practice, and are deprecated in the C++11 draft standard. We recommend that you don’t use throw exception specifications except for throw (), which indicates that the function allows no exceptions to escape.

How are C++ exceptions implemented in MSVC?

In the Microsoft C++ compiler (MSVC), C++ exceptions are implemented for SEH. However, when you write C++ code, use the C++ exception syntax. For more information about SEH, see Structured Exception Handling (C/C++). Exception specifications were introduced in C++ as a way to specify the exceptions that a function might throw.