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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . S T R I N G _ H A S H --
--- --
--- S p e c --
--- --
--- Copyright (C) 2009-2015, Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 3, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. --
--- --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception, --
--- version 3.1, as published by the Free Software Foundation. --
--- --
--- You should have received a copy of the GNU General Public License and --
--- a copy of the GCC Runtime Library Exception along with this program; --
--- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
--- <http://www.gnu.org/licenses/>. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package provides a generic hashing function over strings, suitable for
--- use with a string keyed hash table. In particular, it is the basis for the
--- string hash functions in Ada.Containers.
---
--- The algorithm used here is not appropriate for applications that require
--- cryptographically strong hashes, or for application which wish to use very
--- wide hash values as pseudo unique identifiers. In such cases please refer
--- to GNAT.SHA1 and GNAT.MD5.
---
--- Note: this package is in the System hierarchy so that it can be directly
--- be used by other predefined packages. User access to this package is via
--- a renaming of this package in GNAT.String_Hash (file g-strhas.ads).
-
-package System.String_Hash is
- pragma Pure;
-
- generic
- type Char_Type is (<>);
- -- The character type composing the key string type
-
- type Key_Type is array (Positive range <>) of Char_Type;
- -- The string type to use as a hash key
-
- type Hash_Type is mod <>;
- -- The type to be returned as a hash value. This must be a 32-bit
- -- unsigned type with full range 0 .. 2**32-1, no other type is allowed
- -- for this instantiation (checked in the body by Compile_Time_Error).
-
- function Hash (Key : Key_Type) return Hash_Type;
- pragma Inline (Hash);
- -- Compute a hash value for a key
-
-end System.String_Hash;