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Subject: Re: [Boost-users] units and existing APIs
From: Matthias Schabel (boost_at_[hidden])
Date: 2008-11-03 17:48:10

> I would like to use boost::units in a new application that must
> interface to existing APIs that do not provide templated
> interfaces. What is the easiest way to use these existing functions
> that minimizes the copying of data from raw C pointers to a
> container that holds a specific type of boost::units?

On most compilers, the binary layout of quantity<Unit,Y> should be the
same as that of the value type, Y, so you should be able to do
something like this :

std::vector<quantity<si::energy,double> > v(100);

double *vp = reinterpret_cast<double*>(&v.front());

passing the resulting pointer to/from the legacy functions :


Naturally, you should verify that the layout is really compatible ...


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