##### any_io_executor::require (1 of 3 overloads)

Obtain a polymorphic wrapper with the specified property.

    template<
        typename Property>
    any_io_executor require(
        const Property & p,
        constraint_t< traits::require_member< const base_type &, const Property & >::is_valid >  = 0) const;

Do not call this function directly. It is intended for use with the `require` and `prefer` customisation points.

For example:

    any_io_executor ex = ...;
    auto ex2 = asio::require(ex, execution::blocking.possibly);