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dependencies
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boost::unordered_map<const char*, ...> does NOT, by default, "do the right
thing." Give it hash and equality functors that do.
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Per discussion with Richard, accept the type key for insert() and find() as a
template parameter rather than as std::type_info*. This permits (e.g.) some
sort of compile-time prehashing for common types, without changing the API.
Eliminate iterators from the API altogether, thus avoiding costs associated
with transform_iterator.
Fix existing references in llinitparam.h.
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Maybe it's failing to correctly handle overloaded transform() methods?
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It seems MSVC doesn't like boost::make_transform_iterator() in the context I
was using it. Try directly invoking the iterator's constructor.
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The original LLTypeInfoLookup implementation was based on two assumptions:
small overall container size, and infrequent normal-case lookup failures.
Those assumptions led to binary-searching a sorted vector, with linear search
as a fallback to cover the problem case of two different type_info* values for
the same type. As documented in the Jira, this turned out to be a problem. The
container size was larger than expected, and failed lookups turned out to be
far more common than expected.
The new implementation is based on a hash map of std::type_info::name()
strings, which should perform equally well in the success and failure cases:
no special-case fallback logic.
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In a number of places, the viewer uses a lookup based on std::type_info*. We
used to use std::map<std::type_info*, whatever>. But on Linux,
&typeid(SomeType) can produce different pointer values, depending on the
dynamic load module in which the code is executed. Introduce
LLTypeInfoLookup<T>, with an API that deliberately mimics
std::map<std::type_info*, T>. LLTypeInfoLookup::find() first tries an
efficient search for the specified std::type_info*. But if that fails, it
scans the underlying container for a match on the std::type_info::name()
string. If found, it caches the new std::type_info* to optimize subsequent
lookups with the same pointer.
Use LLTypeInfoLookup instead of std::map<std::type_info*, ...> in
llinitparam.h and llregistry.h.
Introduce LLSortedVector<KEY, VALUE>, a std::vector<std::pair<KEY, VALUE>>
maintained in sorted order with binary-search lookup. It presents a subset of
the std::map<KEY, VALUE> API.
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