C++ exception handling

EPOC provides its own exception handling mechanisms. C++ exception handling (try, catch and throw) is not used because:

• compiler support for C++ exception handling was unavailable or inadequate at the time of EPOC's design

• EPOC exception handling is specialised for use with other EPOC conventions (C and T classes, 32-bit integer error codes), allowing lower overheads than for C++ exception support

Existing C++ programs for other platforms that use exception handling must be modified before they can be used.

Note that the cleanup and two-phase construction idioms that are part of EPOC exception support would still be needed if C++ exception handling were used.