#### any_io_executor::prefer

Obtain a polymorphic wrapper with the specified property.

    template<
        typename Property>
    any_io_executor prefer(
        const Property & p,
        constraint_t< traits::prefer_member< const base_type &, const Property & >::is_valid >  = 0) const;
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    template<>
    any_io_executor prefer(
        const execution::blocking_t::possibly_t & p,
        int ) const;
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    template<>
    any_io_executor prefer(
        const execution::outstanding_work_t::tracked_t & p,
        int ) const;
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    template<>
    any_io_executor prefer(
        const execution::outstanding_work_t::untracked_t & p,
        int ) const;
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    template<>
    any_io_executor prefer(
        const execution::relationship_t::fork_t & p,
        int ) const;
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    template<>
    any_io_executor prefer(
        const execution::relationship_t::continuation_t & p,
        int ) const;
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    any_executor prefer(
        Property ) const;
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