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We have made several improvements to adding data into an `ArrayHandle`. ## Moving data from an `std::vector` For numerous reasons, it is convenient to define data in a `std::vector` and then wrap that into an `ArrayHandle`. It is often the case that an `std::vector` is filled and then becomes unused once it is converted to an `ArrayHandle`. In this case, what we really want is to pass the data off to the `ArrayHandle` so that the `ArrayHandle` is now managing the data and not the `std::vector`. C++11 has a mechanism to do this: move semantics. You can now pass variables to functions as an "rvalue" (right-hand value). When something is passed as an rvalue, it can pull state out of that variable and move it somewhere else. `std::vector` implements this movement so that an rvalue can be moved to another `std::vector` without actually copying the data. `make_ArrayHandle` now also takes advantage of this feature to move rvalue `std::vector`s. There is a special form of `make_ArrayHandle` named `make_ArrayHandleMove` that takes an rvalue. There is also a special overload of `make_ArrayHandle` itself that handles an rvalue `vector`. (However, using the explicit move version is better if you want to make sure the data is actually moved.) ## Make `ArrayHandle` from initalizer list A common use case for using `std::vector` (particularly in our unit tests) is to quickly add an initalizer list into an `ArrayHandle`. Now you can by simply passing an initializer list to `make_ArrayHandle`. ## Deprecated `make_ArrayHandle` with default shallow copy For historical reasons, passing an `std::vector` or a pointer to `make_ArrayHandle` does a shallow copy (i.e. `CopyFlag` defaults to `Off`). Although more efficient, this mode is inherintly unsafe, and making it the default is asking for trouble. To combat this, calling `make_ArrayHandle` without a copy flag is deprecated. In this way, if you wish to do the faster but more unsafe creation of an `ArrayHandle` you should explicitly express that. This requried quite a few changes through the VTK-m source (particularly in the tests). ## Similar changes to `Field` `vtkm::cont::Field` has a `make_Field` helper function that is similar to `make_ArrayHandle`. It also features the ability to create fields from `std::vector`s and C arrays. It also likewise had the same unsafe behavior by default of not copying from the source of the arrays. That behavior has similarly been depreciated. You now have to specify a copy flag. The ability to construct a `Field` from an initializer list of values has also been added. |
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.. | ||
internal | ||
raytracing | ||
testing | ||
Actor.cxx | ||
Actor.h | ||
AxisAnnotation2D.cxx | ||
AxisAnnotation2D.h | ||
AxisAnnotation3D.cxx | ||
AxisAnnotation3D.h | ||
AxisAnnotation.cxx | ||
AxisAnnotation.h | ||
BitmapFont.cxx | ||
BitmapFont.h | ||
BitmapFontFactory.cxx | ||
BitmapFontFactory.h | ||
BoundingBoxAnnotation.cxx | ||
BoundingBoxAnnotation.h | ||
Camera.cxx | ||
Camera.h | ||
Canvas.cxx | ||
Canvas.h | ||
CanvasRayTracer.cxx | ||
CanvasRayTracer.h | ||
CMakeLists.txt | ||
Color.cxx | ||
Color.h | ||
ColorBarAnnotation.cxx | ||
ColorBarAnnotation.h | ||
ColorLegendAnnotation.cxx | ||
ColorLegendAnnotation.h | ||
ConnectivityProxy.cxx | ||
ConnectivityProxy.h | ||
Cylinderizer.h | ||
DecodePNG.h | ||
EncodePNG.h | ||
LineRenderer.cxx | ||
LineRenderer.h | ||
Mapper.cxx | ||
Mapper.h | ||
MapperConnectivity.cxx | ||
MapperConnectivity.h | ||
MapperCylinder.cxx | ||
MapperCylinder.h | ||
MapperPoint.cxx | ||
MapperPoint.h | ||
MapperQuad.cxx | ||
MapperQuad.h | ||
MapperRayTracer.cxx | ||
MapperRayTracer.h | ||
MapperVolume.cxx | ||
MapperVolume.h | ||
MapperWireframer.cxx | ||
MapperWireframer.h | ||
MatrixHelpers.h | ||
Quadralizer.h | ||
ScalarRenderer.cxx | ||
ScalarRenderer.h | ||
Scene.cxx | ||
Scene.h | ||
TextAnnotation.cxx | ||
TextAnnotation.h | ||
TextAnnotationBillboard.cxx | ||
TextAnnotationBillboard.h | ||
TextAnnotationScreen.cxx | ||
TextAnnotationScreen.h | ||
TextRenderer.cxx | ||
TextRenderer.h | ||
Texture2D.h | ||
Triangulator.h | ||
View1D.cxx | ||
View1D.h | ||
View2D.cxx | ||
View2D.h | ||
View3D.cxx | ||
View3D.h | ||
View.cxx | ||
View.h | ||
Wireframer.h | ||
WorldAnnotator.cxx | ||
WorldAnnotator.h |