On 8/21/06, Emil Dotchevski <emildotchevski@hotmail.com> wrote:
Hello,
I just finished an update to the exception library I am planning to propose for addition to Boost. I appreciate all feedback, including incompatibility reports with various compilers (I believe the implementation to be standard-conforming, but I have only tested with msvc 7.1/8.0 and gcc 3.4.4).
As usual, the latest documentation is here:
http://www.revergestudios.com/boost-exception/boost-exception.htm
Here is a zip file with the source code, complete with jamfiles and tests:
http://www.revergestudios.com/boost-exception/boost-exception.zip
Here's what's new in this update: class boost::exception now defines what() function, similarly to std::exception. It automatically formats a message which combines all exception info stored by operator<< in the boost::exception object. The message is not user-friendly; it is designed for dumping in log files and for other debugging systems.
For what() to work, the system needs to be able to convert the exception info values stored in a boost::exception to string. Because this is not a critical feature, I thought it wouldn't be a good idea to require the user code to provide such a conversion for everything. The current implementation generates a string representation of each exception info value (at the time exception_info is called) as follows:
- If a suitable overload for the unqualified call to to_string (passing the exception info value as the only argument) is found, that overload is used.
- Otherwise, if a suitable overload for serializing the exception info value into a std::ostringstream is found, that overload is used.
- Otherwise the system gives up and uses a generic "stub" string to indicate that the exception info value could not be converted to string.
This is accomplished through the to_string function template, which has the following signature:
template <class T> std::string to_string( T const &, char const * stub );
Do you think that to_string is universally useful? Is there anything in Boost with similar functionality? Perhaps we can make to_string a separate addition to Boost?
std::string s = boost::lexical_cast<std::string>(T const&); Thanks,
Emil
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-- Thanks, Greg