(***********************************************************************)
(*                                                                     *)
(*                           Objective Caml                            *)
(*                                                                     *)
(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
(*                                                                     *)
(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the Q Public License version 1.0.               *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

(* Miscellaneous useful types and functions *)

val fatal_error: string -> 'a
exception Fatal_error

val map_end: ('a -> 'b) -> 'a list -> 'b list -> 'b list
        (* [map_end f l t] is [map f l @ t], just more efficient. *)
val for_all2: ('a -> 'b -> bool) -> 'a list -> 'b list -> bool
        (* Same as [List.for_all] but for a binary predicate.
           In addition, this [for_all2] never fails: given two lists
           with different lengths, it returns false. *)
val replicate_list: 'a -> int -> 'a list
        (* [replicate_list elem n] is the list with [n] elements
           all identical to [elem]. *)
val list_remove: 'a -> 'a list -> 'a list
        (* [list_remove x l] returns a copy of [l] with the first
           element equal to [x] removed. *)
val split_last: 'a list -> 'a list * 'a
        (* Return the last element and the other elements of the given list. *)

val may: ('a -> unit) -> 'a option -> unit
val may_map: ('a -> 'b) -> 'a option -> 'b option

val find_in_path: string list -> string -> string
        (* Search a file in a list of directories. *)
val remove_file: string -> unit
        (* Delete the given file if it exists. Never raise an error. *)
val expand_directory: string -> string -> string
        (* [expand_directory alt file] eventually expands a [+] at the
           beginning of file into [alt] (an alternate root directory) *)

val create_hashtable: int -> ('a * 'b) list -> ('a, 'b) Hashtbl.t
        (* Create a hashtable of the given size and fills it with the
           given bindings. *)

val copy_file: in_channel -> out_channel -> unit
        (* [copy_file ic oc] reads the contents of file [ic] and copies
           them to [oc]. It stops when encountering EOF on [ic]. *)
val copy_file_chunk: in_channel -> out_channel -> int -> unit
        (* [copy_file_chunk ic oc n] reads [n] bytes from [ic] and copies
           them to [oc]. It raises [End_of_file] when encountering
           EOF on [ic]. *)

val log2: int -> int
        (* [log2 n] returns [s] such that [n = 1 lsl s] 
           if [n] is a power of 2*)
val align: int -> int -> int
        (* [align n a] rounds [n] upwards to a multiple of [a]
           (a power of 2). *)
val no_overflow_add: int -> int -> bool
        (* [no_overflow_add n1 n2] returns [true] if the computation of
           [n1 + n2] does not overflow. *)
val no_overflow_sub: int -> int -> bool
        (* [no_overflow_add n1 n2] returns [true] if the computation of
           [n1 - n2] does not overflow. *)