id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5436	C++0x patch for boost::unit	Chris Jefferson	Matthias Schabel	"The attached patch makes boost::unit work correctly in C++0x, by making the code NOT compile when a dimension ordinal is used more than once.

At the moment this code is only needed in clang's c++0x mode, but it doesn't seem to break g++ c++03 or c++0x, so put it all the time.

The technique currently used (friend functions being double declared) doesn't work any more in C++0x, as:

C++03 says: When a function is defined in a friend function declaration in a
class template, the function is defined at each instantiation of the class
template. The function is defined even if it is never used. 

C++0x says: When a function is defined in a friend function declaration in a
class template, the function is instantiated when the function is odr-used.

The new technique makes functions with different return values, which still causes an error."	Patches	closed	To Be Determined	units	Boost 1.47.0	Problem	fixed