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vectors.reverse_find [2012/01/24 07:58] (current)
thomaslocke created
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 +<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;​
 +   ​Needle ​   : Unbounded_String;​
 +   ​Pos ​      : 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);
 +
 +   ​-- ​ First search. This will fail because we have no FooBar quote.
 +   ​Needle := To_Unbounded_String ("​FooBar"​);​
 +   Pos := Quotes.Find (Item  => Needle);
 +   
 +   if Pos = No_Element then
 +      IO.Put_Line ("​No_Element"​);​
 +   else
 +      IO.Put_Line (To_Index (Position => Pos)'​Img);​
 +   end if;
 +   
 +   ​-- ​ Second search. This will succeed, finding the quote at index 7.
 +   ​Needle := To_Unbounded_String ​
 +     ​("​Most days I wake up thinking I'm the luckiest bastard alive."​);​
 +   Pos := Quotes.Find (Item  => Needle);
 +   
 +   if Pos = No_Element then
 +      IO.Put_Line ("​No_Element"​);​
 +   else
 +      IO.Put_Line (To_Index (Position => Pos)'​Img);​
 +   end if;
 +   
 +   ​-- ​ Third search. This will fail, because we start the search at index 8.
 +   ​Needle := To_Unbounded_String ​
 +     ​("​Most days I wake up thinking I'm the luckiest bastard alive."​);​
 +   Pos := Quotes.To_Cursor (Index => 8);
 +   Pos := Quotes.Find (Item  => Needle,
 +                       ​Position => Pos);
 +   
 +   if Pos = No_Element then
 +      IO.Put_Line ("​No_Element"​);​
 +   else
 +      IO.Put_Line (To_Index (Position => Pos)'​Img);​
 +   end if;
 +end Quotes;
 +</​code>​
 +
 +[[Ada.Containers.Vectors#​Vectors.Find | Go back]]
  

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