#### io_context::strand::post

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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