void FontFaceSet::completedLoading()
{
if (m_promise)
fulfillPromise();
m_promise = Nullopt;
// FIXME: Fire a "loadingdone" and possibly a "loadingerror" event asynchronously.
}
/** Set a promise/result from a future/result
*
* Roughly this does:
*
* <pre>promise.set_value(future);</pre>
*
* but it takes care of exceptions and works with `void`.
*
* We might need this when working with generic code because
* the trivial implementation does not work with `void` (before C++1z).
*
* @param promise output (a valid future or a result)
* @param future input (a ready/waitable future or a valid result)
*/
template<class P, class F> inline
void setPromise(P& promise, F&& future)
{
fulfillPromise(promise, [&]{ return std::forward<F>(future).get(); });
}