DRTVWR-588: Move LLSingleton dependency on LLMainThreadTask to .cpp.

Introduce LLSingletonBase::getInstanceForSecondaryThread(), used both by
LLSingleton and LLParamSingleton. Because it's a method of the non-template
base class, because it's not itself a template method,
getInstanceForSecondaryThread()'s definition can live in llsingleton.cpp. This
is what calls LLMainThreadTask::dispatch().

To support LLParamSingleton, though, getInstanceForSecondaryThread() must be
capable of handling arguments. For that, it accepts a nullary std::function
returning the LLSingletonBase* of interest.

Packing initParamSingleton() arguments into a nullary std::function to pass to
getInstanceForSecondaryThread() sounds like a job for std::bind().
Unfortunately std::bind() has trouble forwarding int and string literals to a
function that infers its argument types. To work around that, use
boost::call_traits::param_type and a lambda with an explicit tuple.

0 files changed, 0 insertions, 0 deletions