Exception (Requirements)

Requirements

1. Exceptions should be compatible to std::exceptions
2. Exceptions should be lightweight and easy to use
3. It must be possible to add information to an exception when throwing
4. It must be possible to add information to already thrown exceptions (rethrow)
5. It must be possible to throw and catch exceptions over thread borders

Design-Decisions:

• std::exceptions are used as a base class for our Exceptions because this allows (1).
• We only enhance our Exceptions to allow them to contain more information than a single char array. This satisfies (2) as well as (3) and (4).
• We provide two macros MIRA_THROW and MIRA_RETHROW. This makes it easy to throw and re-throw exceptions and to add information to the exception via streams (2),(3),(4).
• The interface of our exceptions is stable and allows future extensions for throwing exceptions over thread borders to achieve (5).