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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Q: type ... is new String
Date: Wed, 30 May 2012 16:33:45 +0000 (UTC)
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Date: 2012-05-30T16:33:45+00:00
List-Id: <comp.lang.ada>

Any comments on the effectiveness of using multiple types for different
categories of strings, rather than "String" all the time?
  I have a TV program database with a base directory, containing a folder
for each show, which in turn has a folder for each season, which then
has a folder for each episode, which then contains the actual video, eg
  c:\TV\I Love Lucy\1975\The New Neighbor\video.mpg
Instead of wordy, and error prone, calls on Ada.Directories.Compose, or
  Episode & '\' & Video_File
Would it be useful to have
  type Show_Paths is new String;
  type Season_Paths is new String;
  type Episode_Paths is new String;
  ...
  function "+"(Show : Show_Paths; Season : String) return Season_Paths;
  function "+"(Show_Season : Season_Paths; Episode : String)
    return Episode_Paths;
  etc
so one could write
  This_Show : Show_Paths := ...
  First_Episode_Name : String := ...
  Episode_Path : Episode_Paths := This_Show + "1975" + First_Episode_Name;
but the compiler would object to
  Episode_Path : Episode_Paths := This_Show + First_Episode_Name;