ImperativeIO functor
functor ImperativeIO ( ... ) : IMPERATIVE_IO (* OPTIONAL *)
The optional ImperativeIO functor can be used to implement (derive) an imperative-style stream I/O facility in terms of a lazy functional stream I/O facility. In the imperative style, input and output operations do not return a new stream each time but cause side-effects on their arguments. Most functions can raise the Io exception for various reasons, including illegal or inconsistent parameters, IO failures, and attempts to do I/O on closed output streams.
The ImperativeIO functor is not often needed, as the required BinIO and TextIO structures supply imperative-style I/O for most situations. It plays a useful role when the programmer needs to construct I/O facilities with element types other than char or Word8.word, or ones based on user-specified I/O primitives.
structure StreamIO : STREAM_IO
structure Vector : MONO_VECTOR
structure Array : MONO_ARRAY
sharing type StreamIO.elem = Vector.elem = Array.elem
sharing type StreamIO.vector = Vector.vector = Array.vector
structure StreamIO : STREAM_IO
StreamIO and do a little extra bookkeeping.
IMPERATIVE_IO,MONO_ARRAY,MONO_VECTOR,PrimIO,STREAM_IO,StreamIO
Generated October 02, 2003
Last Modified April 15, 1996
Comments to John Reppy.
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