[ruby-talk:02214] *DBM#invert

There seems really to be a bug! DBM#invert will build a hash during
execution that contains all values as keys and the keys as
values. That means your demo 'mdb.each { ... }' should return:

1--a
2--b

But the bug seems to be that DBM#invert returns the DBM instance
itself instead of the new-created hash! So in your example DBM#each is
called instead of Hash#each.

The same is true for GDBM!

Applying following patches should help:



HTH,
\cle


ts writes:
> 
>  classes *DBM has a method #invert, but this method don't seem to work or
>  I've not understood how to use it :
> 
> pigeon% cat b.rb
> #!/usr/bin/ruby
> require "gdbm"
> dbm = GDBM.open("toto")
> dbm["a"] = "1"
> dbm["b"] = "2"
> dbm.each { |x, y| print "#{x}--#{y}\n" }
> mbd = dbm.invert
> mbd.each { |x, y| print "#{x}--#{y}\n" }
> dbm.close
> pigeon% b.rb
> a--1
> b--2
> a--1
> b--2
> pigeon% 
> 
> 
> Guy Decoux

-- 
Clemens Hintze  mailto: [e-mail]