These changes are basically to support some upcoming changes to
ArrayHandleZip. The major additions are an implementation of VecTraits
for Pair and an overloaded << operator to ostream for Pair.
I also had to declare the operator<< for Pair to be in Types.h. Under
some circumstances the operator has to either be declared before the
template is declared or declared in the vtkm namespace. (The reasons are
described at <http://clang.llvm.org/compatibility.html#dep_lookup> but I
still don't understand.) I tried adding it to the vtkm namespace, but
that caused several of the other operator<< to fail. Since there is no
way to guarantee that Pair.h is declared before, say, ArrayHandle.h, I
moved the implementation to Types.h.
Since I was moving operator<< to Types.h, I went ahead and moved the
TypeTraits and VecTraits to their respective headers. Since Pair is
declared (but not implemented) in Types.h, these templated classes can
be implemented without including Pair.h.
vtkm::Pair can hold vtkm::Vec so we need to call the proper constructor
for vtkm::Vec.
Now that vtkm::TypeTraits don't error out on unknown types, we don't need
the weird specialization for vtkm::Pair.
Providing these types tends to "lock in" the precision of the algorithms
used in VTK-m. Since we are using templating anyway, our templates
should be generic enough to handle difference precision in the data.
Usually the appropriate type can be determined by the data provided. In
the case where there is no hint on the precision of data to use (for
example, in the code that provides coordinates for uniform data), there
is a vtkm::FloatDefault.
Since we want our code to generally handle data of different precision
(for example either float or double) expand the types in our list types
to include multiple precision.
There are multiple reasons for this name change:
* The name Tuple conflicts with the boost::Tuple class, which as a
different interface and feature set. This gets confusing, especially
since VTK-m uses boost quite a bit.
* The use of this class is usually (although not always) as a
mathematical vector.
* The vtkm::Scalar and vtkm::Vector* classes are going to go away soon
to better support multiple base data type widths. Having this
abbriviated name will hopefully make the code a bit nicer when these
types have to be explicitly specified.
Also modified the implementation a bit to consolidate some of the code.
In preparation for supporting base types with more widths, add typedefs
for the base types with explicit widths (number of bits).
Also added a IdComponent type that should be used for indices for
components into tuples and vectors. There now should be no reason to use
"int" inside of VTK-m code (especially for indexing). This change cleans
up many of the int types that were used throughout.
We made this change a while ago to help with completion in IDEs.
(Completion was matching a bunch of wrapper macros that were almost
never used anywhere.) Most of the changes are in comments, but there are
a few bad macro definitions.
