Request the strand to invoke the given function object.

template<
    typename Function,
    typename Allocator>
void post(
    Function && f,
    const Allocator & a) const;
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(Deprecated: Use post.) Request the strand to invoke the given handler and return immediately.

template<
    typename LegacyCompletionHandler>
auto post(
    LegacyCompletionHandler && handler);
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