On Sun, Jun 13, 2010 at 11:18 PM, alfC wrote:

Hi,

 I am curious. In Boost.Units it is not possible to *initialize* a quantity from a plain value, the closest thing to it is the ::from_value static member function. But ... What is the magic that makes this particular initialization compile?

 boost::units::quantitysi::length L(0); //compiles and works as expected

but *not* these ones:

 boost::units::quantitysi::length L(1); //does not compile or  boost::units::quantitysi::length L(0.); //does not compile

(gives a compile error, "no matching function for call to '...::quantity(int/double)')

By the way, I think it is a great feature! I am interested to know how is this achieved.

Without looking at the code, my first guess is that it takes a pointer, and you are really passing a null pointer. -- Cory Nelson http://int64.org