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This reverts commit 5ed8df22cd59680a685c4ada7daa5555bf59d4fe.
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Introduce AlwaysReturn<void> specialization, which always discards any result
of calling the specified callable with specified args.
Derive new Windows_SEH_exception from LLException, not std::runtime_error.
Put the various SEH functions in LL::seh nested namespace, e.g.
LL::seh::catcher() as the primary API.
Break out more levels of Windows SEH handler to work around the restrictions on
functions containing __try/__except.
The triadic catcher() overload now does little save declare a std::string
stacktrace before forwarding the call to catcher_inner(), passing a reference
to stacktrace along with the trycode, filter and handler functions.
catcher_inner() accepts the stacktrace and the three function template
arguments. It contains the __try/__except logic. It calls a new filter_()
wrapper template, which calls fill_stacktrace() before forwarding the call to
the caller's filter function. fill_stacktrace(), in the .cpp file, contains
the logic to populate the stacktrace string -- unless the Structured Exception
is stack overflow, in which case it puts an explanatory string instead.
catcher_inner()'s __except clause passes not only the code, but also the
stacktrace string, to the caller's handler function. It wraps the caller's
handler function in always_return<rtype>(), where rtype is the type returned
by the trycode function. This allows a handler to return a value, while also
supporting the void handler case, e.g. one that throws a C++ exception. (This
is why we need AlwaysReturn<void>: some trycode() functions are themselves
void.)
For the dyadic catcher() overload, introduce common_filter() containing the
logic to distinguish a C++ exception from any other kind of Structured
Exception. The fact that the stacktrace is captured before the filter function
is called should permit capturing a stacktrace for a C++ exception as well as
for most other Structured Exceptions.
As before, the monadic catcher() overload supplies the rethrow() handler, in
the .cpp file.
Change existing calls from seh_catcher() to LL::seh::catcher().
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LF, and trim trailing whitespaces as needed
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Add LL::always_return<T>(), which takes a callable and variadic arguments. It
calls the callable with those arguments and, if the returned type is
convertible to T, converts it and returns it. Otherwise it returns T().
always_return() is generalized from, and supersedes,
LLEventDispatcher::ReturnLLSD.
Add LL::function_arity<CALLABLE>, which extends
boost::function_types::function_arity by reporting results for both
std::function<CALLABLE> and boost::function<CALLABLE>. Use for
LL::apply(function, LLSD array) as well as for LLEventDispatcher.
Make LLEventDispatcher::add() overloads uniformly distinguish between a
callable (whether non-static member function or otherwise) that accepts a
single LLSD parameter, versus any other signature. Accepting exactly one LLSD
parameter signals that the callable will accept the composite arguments LLSD
blob, instead of asking LLEventDispatcher to unpack the arguments blob into
individual arguments.
Support add(subclass method) overloads for arbitrary-parameters methods as
well as for (const LLSD&) methods. Update tests accordingly: we need no longer
pass the boilerplate lambda instance getter that binds and returns 'this'.
Extract to the two LLEventDispatcher::make_invoker() overloads the LL::apply()
logic formerly found in ReturnLLSD.
Change lleventdispatcher_test.cpp tests from boost::bind(), which accepts
variadic arguments (even though it only passes a fixed set to the target
callable), to fixed-signature lambdas. This is because the revamped add()
overloads care about signature.
Add a test for a non-static method that accepts (const LLSD&), in other words
the composite arguments LLSD blob, and likewise returns LLSD.
(cherry picked from commit 95b787f7d7226ee9de79dfc9816f33c8bf199aad)
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