adamc@2: (* Copyright (c) 2008, Adam Chlipala
adamc@2:  * All rights reserved.
adamc@2:  *
adamc@2:  * Redistribution and use in source and binary forms, with or without
adamc@2:  * modification, are permitted provided that the following conditions are met:
adamc@2:  *
adamc@2:  * - Redistributions of source code must retain the above copyright notice,
adamc@2:  *   this list of conditions and the following disclaimer.
adamc@2:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@2:  *   this list of conditions and the following disclaimer in the documentation
adamc@2:  *   and/or other materials provided with the distribution.
adamc@2:  * - The names of contributors may not be used to endorse or promote products
adamc@2:  *   derived from this software without specific prior written permission.
adamc@2:  *
adamc@2:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@2:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@2:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@2:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@2:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@2:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@2:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@2:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@2:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@2:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@2:  * POSSIBILITY OF SUCH DAMAGE.
adamc@2:  *)
adamc@2: 
adamc@2: signature SEARCH = sig
adamc@2: 
adamc@2:     datatype ('state, 'abort) result =
adamc@2:              Return of 'abort
adamc@2:            | Continue of 'state
adamc@2: 
adamc@2:     type ('data, 'state, 'abort) mapfolder =
adamc@2:          'data -> 'state -> ('data * 'state, 'abort) result
adamc@2: 
adamc@11:     type ('context, 'data, 'state, 'abort) mapfolderB =
adamc@11:          'context -> 'data -> 'state -> ('data * 'state, 'abort) result
adamc@11: 
adamc@11:     val return2 : 'data -> 'state -> ('data * 'state, 'abort) result
adamc@2: 
adamc@2:     val map : ('state1, 'abort) result
adamc@2:               * ('state1 -> 'state2)
adamc@2:               -> ('state2, 'abort) result
adamc@2: 
adamc@2:     val map2 : ('state2 -> ('state1 * 'state2, 'abort) result)
adamc@2:                * ('state1 -> 'state1')
adamc@2:                -> ('state2 -> ('state1' * 'state2, 'abort) result)
adamc@11: 
adamc@2:     val bind : ('state1, 'abort) result
adamc@2:                * ('state1 -> ('state2, 'abort) result)
adamc@2:                -> ('state2, 'abort) result
adamc@2: 
adamc@2:     val bind2 : ('state2 -> ('state1 * 'state2, 'abort) result)
adamc@6:                * ('state1 -> 'state2 -> ('state1' * 'state2, 'abort) result)
adamc@6:                -> ('state2 -> ('state1' * 'state2, 'abort) result)
adamc@2: 
adamc@2:     val bindP : (('state11 * 'state12) * 'state2, 'abort) result
adamc@6:                 * ('state11 -> 'state2 -> ('state11 * 'state2, 'abort) result)
adamc@2:                 -> (('state11 * 'state12) * 'state2, 'abort) result
adamc@2: 
adamc@2: end