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#### is_async_stream

Determine if `T` meets the requirements of AsyncStream.

##### Synopsis

Defined in header `<boost/beast/core/stream_traits.hpp>`

    template<
        class T>
    using is_async_stream = see-below;

##### Description

Metafunctions are used to perform compile time checking of template types. This type will be `std::true_type` if `T` meets the requirements, else the type will be `std::false_type`.

##### Example

Use with `static_assert`:

    template < class AsyncStream>
    void f(AsyncStream& stream)
    {
        static_assert (is_async_stream<AsyncStream>::value,
            "AsyncStream type requirements not met" );
    ...

Use with `std::enable_if` (SFINAE):

    template < class AsyncStream>
    typename std::enable_if<is_async_stream<AsyncStream>::value>::type
    f(AsyncStream& stream);