BZDEV: Missing <string>

[Todd V. <tve...@oo...>]

> Unfortunately bzconfig says that the compiler doesn't support
> enum computations nor does SGI ship the <string> part of the
> standard lib. (There's a rope class which supposedly avoids some
> of the threading problems in string, but that doesn't [aid]
> me here). There is also no valarray header.

Depending on the <string> class is a problem with the Cray compiler 
too.  

Possible solutions:
* test for <string> in compiler/bzconfig and, if missing, disable
  the parts of the library which require it.  Makes the source code
  a bit messy..
* borrow a <string> class from elsewhere (gnu lib?).  Could possibly
  package it with blitz, and automatically use it when <string>
  seems to me missing.  Unfortunately many of the <string> implementations
  I've seen aren't very self-reliant (i.e. they need to include half
  the standard library..)  Anyone know of a compact, self-contained
  string class?

I'd favour the 2nd solution, because the first solution would be
a bit messy.

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