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-- Efficient expandable one dimensional array type.
-- Copyright (C) 2015 - 2016 Tristan Gingold
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <gnu.org/licenses>.
-- This package mimics GNAT.Table, but:
-- - the index type can be any discrete type (in particular a modular type)
-- - the increment is not used
-- - the interface is simplified.
generic
-- This package creates:
-- array (Table_Index_Type range Table_Low_Bound .. <>)
-- of Table_Component_Type;
type Table_Component_Type is private;
type Table_Index_Type is (<>);
-- The lowest bound of the array. Note that Table_Low_Bound shouldn't be
-- Table_Index_Type'First, as otherwise Last may raise constraint error
-- when the table is empty.
Table_Low_Bound : Table_Index_Type;
package Dyn_Tables is
-- Ada type for the array.
type Table_Type is
array (Table_Index_Type range <>) of Table_Component_Type;
-- Fat subtype (so that the access is thin).
subtype Big_Table_Type is
Table_Type (Table_Low_Bound .. Table_Index_Type'Last);
-- Access type for the vector. This is a thin pointer so that it is
-- compatible with C pointer, as this package uses malloc/realloc/free for
-- memory management.
type Table_Thin_Ptr is access all Big_Table_Type;
pragma Convention (C, Table_Thin_Ptr);
for Table_Thin_Ptr'Storage_Size use 0;
-- Non user visible data.
type Instance_Private is private;
-- Type for the dynamic table.
type Instance is record
-- Pointer to the table. Note that the use of a thin pointer to the
-- largest array, this implementation bypasses Ada index checks.
Table : Table_Thin_Ptr := null;
-- Private data.
Priv : Instance_Private;
end record;
-- Initialize the table. This must be done by users.
procedure Init (T : in out Instance; Table_Initial : Positive);
-- Logical bounds of the array.
First : constant Table_Index_Type := Table_Low_Bound;
function Last (T : Instance) return Table_Index_Type;
pragma Inline (Last);
-- Return the index of the next bound after last.
function Next (T : Instance) return Table_Index_Type;
-- Deallocate all the memory. Makes the array unusable until the next
-- call to Init.
procedure Free (T : in out Instance);
-- Increase by 1 the length of the array. This may allocate memory.
procedure Increment_Last (T : in out Instance);
pragma Inline (Increment_Last);
-- Decrease by 1 the length of the array.
procedure Decrement_Last (T : in out Instance);
pragma Inline (Decrement_Last);
-- Increase or decrease the length of the array by specifying the upper
-- bound.
procedure Set_Last (T : in out Instance; Index : Table_Index_Type);
-- Append VAL to the array. This always increase the length of the array.
procedure Append (T : in out Instance; Val : Table_Component_Type);
pragma Inline (Append);
-- Increase by NUM the length of the array.
procedure Allocate (T : in out Instance; Num : Natural := 1);
-- Reserve memory for NUM extra entries.
procedure Reserve (T : in out Instance; Num : Natural);
private
type Unsigned is mod 2**32;
type Instance_Private is record
-- Number of allocated elements in the table.
Length : Unsigned := 0;
-- Number of used elements in the table.
Last_Pos : Unsigned := 0;
end record;
end Dyn_Tables;
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