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          the io_context
          to invoke the given function object.
        
template<
    typename Function,
    typename OtherAllocator>
void defer(
    Function && f,
    const OtherAllocator & a) const;
          This function is used to ask the io_context
          to execute the given function object. The function object will never be
          executed inside defer(). Instead, it will be scheduled to
          run on the io_context.
        
          If the current thread belongs to the io_context,
          defer() will delay scheduling the function object until the
          current thread returns control to the pool.
        
The function object to be called. The executor will make a copy of the handler object as required. The function signature of the function object must be:
void function();
An allocator that may be used by the executor to allocate the internal storage needed for function invocation.