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Newer C++ compilers have different semantics around LLSDArray's special copy
constructor, which was essential to proper LLSD nesting. In short, we can no
longer trust LLSDArray to behave correctly. Now that we have variadic
functions, get rid of LLSDArray and replace every reference with llsd::array().
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Use them in place of awkward try/catch test boilerplate.
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Test also passes overlong arrays and maps with extraneous keys; in all cases
we expect the same set of values to be passed to the registered functions.
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We'd introduced FunctionsTriple to associate a pair of registered function
names with the Vars* on which those functions should operate. But with more
different tests coming up, it became clear that restating the Vars* every time
a given function name appeared in any such context was redundant.
Instead, extended addf() to accept and store the relevant Vars* for each
registered function, be it the global Vars for the free functions and static
methods or the stack Vars for the non-static methods.
Added varsfor() function to retrieve and validate the Vars* for a given
function name.
Eliminated array_funcs() function, restating aggregates of names to test as
LLSD collections. Where before these were coerced into a separate LLSD map
with ["a"] and ["b"] keys, that map can now be part of the original structure.
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An array-registered function has no param names, so you can only pass an
array: a map would be meaningless. Initial implementation of map-registered
functions assumed that since you CAN pass a map, you MUST pass a map. But in
fact it's meaningful to pass an array as well -- for whatever reason -- and
easy to implement, so there you are. Tests to follow.
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LLSDParam<const char*> is coded to pass NULL for an isUndefined() LLSD value,
so event-based caller can choose whether to pass NULL, "" or whatever string
value to such a parameter. Ensure this behavior.
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One operation we often use is to take an LLSD array of param names, a
corresponding LLSD array of values, and create from them a name=value LLSD
map. Instead of doing that "by hand" every time, use a function.
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Streamline a bit more redundancy from the code in that test.
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Following the C++ convention of having two distinct somethigna, somethingb
names, initially we introduced paramsa, paramsb LLSD arrays, following that
convention all the way down the line. This led to two distinct loops every
time we wanted to walk both arrays, since we didn't want to assume that they
were both the same size. But leveraging the fact that distinct LLSD arrays
stored in the same LLSD container can in fact be of different lengths,
refactored all the pairs of vars into top-level LLSD maps keyed by ["a"] and
["b"]. That lets us perform nested loops rather than duplicating the logic,
making test code much less messy.
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Naively storing a const char* param in a const char* data member ignores the
fact that once the caller's done, the string data referenced by that pointer
will probably be freed. Store the referenced string in a std::string instead.
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A certain popular-but-dumb compiler seems to think that initializing a
std::vector from a pair of iterators requires assignment. A struct containing
a reference cannot be assigned. Pointers get us past this issue.
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We want to break out a couple different test methods that both need the same
data. While we could define a std::vector<FunctionsTriple> in the
lleventdispatcher_data class and initialize it using a classic {} initializer
as in array_funcs(), using a separate function puts it closer to the tests
consuming that data, and helps reduce clutter in the central data class.
Either way, it's cool that BOOST_FOREACH() handles the gory details of
iterating over a std::vector vs. a classic-C array.
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You can't directly write:
BOOST_FOREACH(LLSD item, someLLSDarray) { ... }
because LLSD has two distinct iteration mechanisms, one for arrays and one for
maps, neither using the standard [const_]iterator typedefs or begin()/end()
methods. But with these helpers, you can write:
BOOST_FOREACH(LLSD item, llsd::inArray(someLLSDarray)) { ... }
or
BOOST_FOREACH(const llsd::MapEntry& pair, llsd::inMap(someLLSDmap)) { ... }
These are in namespace llsd instead of being (e.g.) llsd_inMap because with a
namespace at least your .cpp file can have a local 'using':
using namespace llsd;
BOOST_FOREACH(LLSD item, inArray(someLLSDarray)) { ... }
It's namespace llsd rather than LLSD because LLSD can't be both a namespace
and a class name.
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Also, finally got sick of hand-writing the official iterator-loop idiom and
dragged in BOOST_FOREACH(). Because LLSD has two completely different
iteration styles, added inArray and inMap helper classes to be able to write:
BOOST_FOREACH(LLSD item, inArray(someArray)) { ... }
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Previous tests involved a small handful of functions with only a couple
different parameter types. Now we exhaustively invoke every registration case,
plus every metadata query case. Call cases still pending.
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Until now, LLEventAPI has only been able to register functions specifically
accepting(const LLSD&). Typically you add a wrapper method to your LLEventAPI
subclass, register that, have it extract desired params from the incoming LLSD
and then call the actual function of interest.
With help from Alain, added new LLEventAPI::add() methods capable of
registering functions/methods with arbitrary parameter signatures. The code
uses boost::fusion magic to implicitly match incoming LLSD arguments to the
function's formal parameter list, bypassing the need for an explicit helper
method.
New add() methods caused an ambiguity with a previous convenience overload.
Removed that overload and fixed the one existing usage.
Replaced LLEventDispatcher::get() with try_call() -- it's no longer easy to
return a Callable for caller to call directly. But the one known use of that
feature simply used it to avoid fatal LL_ERRS on unknown function-name string,
hence the try_call() approach actually addresses that case more directly.
Added indra/common/lleventdispatcher_test.cpp to exercise new functionality.
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