Note effect of BOOST_USE_SEGMENTED_STACKS if StackAllocator is not explicitly
passed.
Introduce function_heading_for QuickBook template to allow separate
descriptions of swap(fiber), swap(packaged_task) and swap(promise).
Document async() using C++14 std::result_of_t and std::decay_t, aligning with
std::async() documentation.
Rework when_any / when_all examples to use unbounded_channel throughout, since
we always close() the channel after the first value anyway. bounded_channel
doesn't really add much value here.
Make wait_first_outcome_impl() infer its channel pointer type. That way we can
reuse that function instead of coding a separate wait_all_until_error_impl(),
which differs only in using the nchannel facade instead of directly pushing to
unbounded_channel.
Explain use of std::bind() to bind a lambda.
Use a more nuanced discussion of promise lifetime in write_ec() example
function.
Use condition_variable::wait(lock, predicate) in a couple places in
work_sharing.cpp example.
This covers both generic callbacks (adapt_callbacks.cpp,
adapt_method_calls.cpp) and custom Asio completion tokens (yield.hpp,
promise_completion_token.hpp, detail/yield.hpp, detail/promise_handler.hpp).
Mark up the relevant source files to provide code snippets for callbacks.qbk.
This illustrates how to interface a synchronous Fiber function with an async
API whose notification consists of an abstract base class with virtual
success/error methods.
