template <typename TryCallable,
          typename CatchCallable>
inline decltype(auto) try_catch_exception_ptr(
    TryCallable&& t,
    CatchCallable&& c)

Description

Helper function for a try-catch block where what would normally go in the catch block should be called after the catch block. This is useful for situations where the catch-block may yield, since the catch block should be started and ended on the same worker thread (with yielding and stealing, the catch block may end on a different worker thread than where it was started). Because of this, the helper's catch block only stores the exception pointer, and forwards it outside the catch block. Do not replace uses of try_catch_exception_ptr with a plain try-catch without ensuring that the catch-block can never yield. Note: Windows does not seem to have problems resuming a catch block on a different worker thread, but we use this nonetheless on Windows since it doesn't hurt.

Declared at: libs/pika/errors/include/pika/errors/try_catch_exception_ptr.hpp:30

Parameters

TryCallable&& t

CatchCallable&& c