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Question about libg++ 2.7.0 String.h

The program:

#include <String.h>
#include <iostream.h>

main() {
  String a = "string";
  String b = "abc";

  cout << a.from(b.length());
}

generates the following compiler errors:

junk2.cc: In function `int main()':
junk2.cc:8: call of overloaded method `from(unsigned int)' is ambiguous
/usr/local/lib/g++-include/String.h:277: candidates are: String::from(const String &, int)
/usr/local/lib/g++-include/String.h:276:                 String::from(int)
/usr/local/lib/g++-include/String.h:280:                 String::from(char, int)

I personally feel that the return from length() should be usable in from()
without the need for type casting. I'm not very familiar with c++, so I'm not
sure if this a funny in the standards or a bug in libg++, or just 
unreasonable expectations on my part.

Any comments?

Gordon Keith

gordon_kei@antdiv.gov.au
Programmer
Marine Science Section
Australian Antarctic Division