#include <boost/qvm/deduce_vec.hpp>
namespace boost
{
namespace qvm
{
template <
class V,
int Dim=vec_traits<Vector>::dim>
struct deduce_vec
{
typedef /*unspecified*/ type;
};
}
}
is_vec<V>::value is true.
This template is used by Boost QVM whenever it needs to deduce a copyable vector type of certain dimension from a single user-supplied function parameter of vector type. The returned type must have accessible copy constructor. Note that V may be non-copyable.
The main template definition returns an unspecified copyable vector type of size Dim, except if vec_traits<V>::dim==Dim, in which case it returns V, which is suitable only if V is a copyable type. Boost QVM also defines (partial) specializations for the non-copyable vector types it produces. Users can define other (partial) specializations for their own types.
A typical use of the deduce_vec template is for specifying the preferred vector type to be returned by the generic function template overloads in Boost QVM depending on the type of their arguments.