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#### thread_pool::executor_type::defer

Request the thread pool to invoke the given function object.

    template<
        typename Function,
        typename Allocator>
    void defer(
        Function && f,
        const Allocator & a) const;

This function is used to ask the thread pool to execute the given function object. The function object will never be executed inside `defer()`. Instead, it will be scheduled to run on the thread pool.

If the current thread belongs to the thread pool, `defer()` will delay scheduling the function object until the current thread returns control to the pool.

###### Parameters

f

  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();

a

  An allocator that may be used by the executor to allocate the internal storage needed for function invocation.