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vectors.query_element [2012/01/23 21:13] (current)
thomaslocke created
Line 1: Line 1:
 +<code ada>
 +with Ada.Text_IO;​
 +with Ada.Text_IO.Unbounded_IO;​
 +with Ada.Strings.Unbounded; ​     use Ada.Strings.Unbounded;​
 +with Ada.Containers.Vectors; ​    use Ada.Containers;​
 +
 +procedure Quotes is
 +   ​package IO renames Ada.Text_IO;​
 +   ​package SUIO renames Ada.Text_IO.Unbounded_IO;​
 +   ​package Quote_Container is new Vectors (Natural, Unbounded_String);​
 +   use Quote_Container;​
 +   ​Quotes ​   : Vector;
 +   ​Input ​    : IO.File_Type;​
 +   
 +   ​-- ​ This is the "​callback"​ procedure
 +   ​procedure Add_42 (Element : Unbounded_String) is
 +   begin
 +      SUIO.Put_Line (Item => Element & To_Unbounded_String (" 42"));
 +   end Add_42;
 +   ​Q_Cursor ​ : Cursor; ​ --  Declare the cursor.
 +begin
 +   ​IO.Open (File => Input,
 +            Mode => IO.In_File,
 +            Name => "​quotes.txt"​);​
 +   while not IO.End_Of_File (File => Input) loop
 +      Quotes.Append (New_Item => SUIO.Get_Line (File => Input));
 +   end loop;
 +   ​IO.Close (Input);
 +   
 +   ​-- ​ Output the first index
 +   ​Quotes.Query_Element (Index ​  => 0,
 +                         ​Process => Add_42'​Access);​
 + 
 +   ​-- ​ Point the cursor at index 7 of the vector and output the element
 +   ​Q_Cursor := Quotes.To_Cursor (Index => 7);
 +   ​Query_Element (Position => Q_Cursor, Process ​ => Add_42'​Access);​
 +end Quotes;
 +</​code>​
 +
 +[[Ada.Containers.Vectors#​Vectors.Query_Element | Go back]]
  

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