Determines if the given template argument is a seekable stream type, which
is any stream, input or output, that defines a Optional!StreamError seekInStream(ulong offset)
function for seeking to a particular position in a stream, specified by the
offset in terms of elements.
Determines if the given template argument is a seekable stream type, which is any stream, input or output, that defines a Optional!StreamError seekInStream(ulong offset) function for seeking to a particular position in a stream, specified by the offset in terms of elements.