#### any_io_executor::require

Obtain a polymorphic wrapper with the specified property.

    template<
        typename Property>
    any_io_executor require(
        const Property & p,
        typename constraint< traits::require_member< const base_type &, const Property & >::is_valid >::type  = 0) const;
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    template<>
    any_io_executor require(
        const execution::blocking_t::never_t & p,
        int ) const;
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    template<
        typename Property>
    any_executor require(
        Property ) const;
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