Path: utzoo!attcan!uunet!mcvax!ukc!dcl-cs!nott-cs!psxgas
From: psxgas@cs.nott.ac.uk (Alan Shepherd)
Newsgroups: comp.lang.c++
Subject: OOPS library Strings and char*
Message-ID: <2859@robin.cs.nott.ac.uk>
Date: 1 Aug 88 12:57:39 GMT
Organization: Computer Science, Nottingham Univ., UK.
Lines: 23

Does anyone know how to use the OOPS Strings in standard C++ routines which
take char* parameters

eg. filebuf.open(char*, {input,output}) ?

The manual says that the operator const char*() should do the trick, but
this has been commented out of the code and marked 'cfront bug'.  The
replacement, operator constCharPtTy() doesn't seem to work either.  Normal
casting i.e. filebuf.open((char*) &String_name, input) compiles fine, but
doesn't perform as expected.

For the time being, I've adopted the following solution :

  filebuf.open((char*) (String_name(0,String_name.length()).ptr()),input);


This uses the substring class method ptr() which returns a const char* by
converting the string into a substring using the SubString operator()(pos,len)
.

Thanks for any help,

Alan Shepherd