# Module Stream

    module Stream: sig .. end

Streams and parsers.

    type 'a t

The type of streams holding values of type `'a`.

    exception Failure

Raised by parsers when none of the first components of the stream patterns is accepted.

    exception Error of string

Raised by parsers when the first component of a stream pattern is accepted, but one of the following components is rejected.

## Stream builders

    val from : (int -> 'a option) -> 'a t

`Stream.from f` returns a stream built from the function `f`. To create a new stream element, the function `f` is called with the current stream count. The user function `f` must return either `Some <value>` for a value or `None` to specify the end of the stream.

Do note that the indices passed to `f` may not start at `0` in the general case. For example, `[< '0; '1; Stream.from f >]` would call `f` the first time with count `2`.

    val of_list : 'a list -> 'a t

Return the stream holding the elements of the list in the same order.

    val of_string : string -> char t

Return the stream of the characters of the string parameter.

    val of_bytes : bytes -> char t

Return the stream of the characters of the bytes parameter.

- Since 4.02.0

    val of_channel : in_channel -> char t

Return the stream of the characters read from the input channel.

## Stream iterator

    val iter : ('a -> unit) -> 'a t -> unit

`Stream.iter f s` scans the whole stream s, applying function `f` in turn to each stream element encountered.

## Predefined parsers

    val next : 'a t -> 'a

Return the first element of the stream and remove it from the stream. Raise `Stream.Failure` if the stream is empty.

    val empty : 'a t -> unit

Return `()` if the stream is empty, else raise `Stream.Failure`.

## Useful functions

    val peek : 'a t -> 'a option

Return `Some` of "the first element" of the stream, or `None` if the stream is empty.

    val junk : 'a t -> unit

Remove the first element of the stream, possibly unfreezing it before.

    val count : 'a t -> int

Return the current count of the stream elements, i.e. the number of the stream elements discarded.

    val npeek : int -> 'a t -> 'a list

`npeek n` returns the list of the `n` first elements of the stream, or all its remaining elements if less than `n` elements are available.