Custom Exception Types and Declarations in C++
Learn how to declare custom exception types in C++, including creating custom exception classes like MyException, nesting exception declarations, and creating useful base classes for handling errors effectively in your C++ code.
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Declaring a Custom Exception Type class MyException : public std::exception { public: MyException(const std::string& msg) : message(msg) {} const char *what() const noexcept { return message.c_str(); } private: std::string message; }; CS 190 Lecture Notes: Code Review 2 Slide 1
Nest Exception Declarations Wrong: Right: class PersistentStorageFailure : public std::exception { ... }; class PersistentStorage { public: class StorageFailure : public std::exception { ... }; ... }; class PersistentStorage { ... }; throw PersistentStorageFailure( storage corrupted ); throw PeristentStorage::StorageFailure( storage corrupted ); CS 190 Lecture Notes: Code Review 2 Slide 2
Create Useful Base Classes class ExceptionWithErrno : public std::exception { public: ExceptionWithErrno(const std::string& msg) { message = msg + ": " + strerror(errno); } const char *what() const noexcept { return message.c_str(); } private: std::string message; }; class StorageError : public ExceptionWithErrno { public: StorageError(const std::string& msg) : ExceptionWithErrno(msg) {} } CS 190 Lecture Notes: Code Review 2 Slide 3
Another Useful Base Class class ExceptionWithPrintf : public std::exception { public: ExceptionWithPrintf(const char *format, ...) { char buffer[1000]; va_list args; va_start(args, format); vsnprintf(buffer, sizeof(buffer), format, args); message = buffer; } const char *what() const noexcept { return message.c_str(); } private: std::string message; }; throw ExceptionWithPrintf( Couldn t bind to port %d: %s , portNum, strerror(errno)); CS 190 Lecture Notes: Code Review 2 Slide 4
