update header of sequence.mli to explain some assumptions about sequences.

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Simon Cruanes 2013-03-10 15:17:27 +01:00
parent e23e1f8da1
commit f1c101310c

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@ -11,21 +11,32 @@ form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
this software is provided by the copyright holders and contributors "as is" and
any express or implied warranties, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose are
disclaimed. in no event shall the copyright holder or contributors be liable
for any direct, indirect, incidental, special, exemplary, or consequential
damages (including, but not limited to, procurement of substitute goods or
services; loss of use, data, or profits; or business interruption) however
caused and on any theory of liability, whether in contract, strict liability,
or tort (including negligence or otherwise) arising in any way out of the use
of this software, even if advised of the possibility of such damage.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(** Transient iterators, that abstract on a finite sequence of elements. They
are designed to allow easy transfer (mappings) between data structures,
without defining n^2 conversions between the n types. *)
(** {1 Transient iterators, that abstract on a finite sequence of elements. *)
(** The iterators are designed to allow easy transfer (mappings) between data
structures, without defining n^2 conversions between the n types. The
implementation relies on the assumption that a sequence can be iterated
on as many times as needed; this choice allows for high performance
of many combinators. However, for transient iterators, the {!persistent}
function is provided, storing elements of a transient iterator
in memory; the iterator can then be used several times.
Note that some combinators also return sequences (e.g. {!group}). The
transformation is computed on the fly every time one iterates over
the resulting sequence. If a transformation performs heavy computation,
{!persistent} can also be used as intermediate storage. *)
type +'a t = ('a -> unit) -> unit
(** Sequence abstract iterator type, representing a finite sequence of