Vt : Value Types

Overview

Defines classes that provide for type abstraction (VtValue) and enhanced array types (VtArray). The Vt library also provides functions for manipulating value types. This library operates on the level of language data types and there are differences in the C++ and Python interfaces.

Type Erasure with VtValue

The VtValue class wraps type objects (float, int, bool, GfVec3d, and so on) in a type-agnostic container that includes functions for determining the content type within the container. The VtValue class is found in the C++ API only, since Python does not have the strong type restrictions of C++. Python to C++ type conversion is handled automatically by the system.

Shared Arrays - VtArray

The VtArray class represents an arbitrary length homogeneous container. In the C++ API, the constructor lets you create an array of a specified size. The VtArray interface on the Python side is implemented as a set of typed array classes (for example, BoolArray, StringArray, Vec4dArray).