Re: [Boost-users] Re: Guidelines for effective exception usage

On Sun, 2004-08-22 at 23:41, Jonathan Turkanis wrote:

"Stephen torri" wrote in message news:1093230456.8377.44.camel@base.torri.org...

...

Are there any guidelines on where and when to use exceptions?

See http://www.boost.org/more/error_handling.html

Thanks for the link. I had already found this link but was confused on some of advice it gave. The question below are some of my confusion about using exceptions wisely. What I am seeking for each of them is an example explaining how it implements a solution. 1) Use virutal inheritance. I see the example and can understand why its wrong I just do not understand how to fix it. 2) Don't embed a std::string ... How can I use the data I have at the point of the error safely? I want to provide a debug message to the user that will lead them to the answer. This affects 6) Expose relevant information about the cause of the error. In my project I have a base class called BaseException that inherits from std::exception. class BaseException : public std::exception { // virtual functions? virtual const char* what() const throw() = 0; }; I want exceptions in the code to be obvious to what is wrong but use the what() message to say why: class DataTypeException : public BaseException { DataTypeException (std::string msg) : Base_Exception(), m_msg(msg) {} // Specify virtual functions? virtual const char* what() const throw() { try { std::stringstream output; output << m_exception_name << ": " << m_message.c_str() << std::endl; return (output.str()).c_str(); } catch(std::exception &) { return m_exception_name; } } private: std::string m_msg; }; Stephen -- Email: storri@torri.org