This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 12]

CRNifti::NiftiImage::Block	Inner class referring to a subset of an image
CRNifti::NiftiImageData::Element	Inner class representing a single element in the data blob
CRNifti::NiftiImage::Extension	Inner class wrapping a NIfTI extension, a weakly-specified standard for attaching additional metadata to NIfTI-1 and NIfTI-2 images
CRNifti::NiftiImageData::Iterator	Iterator type for `NiftiImageData`, with `Element` as its value type
CRNifti::NiftiImage	Thin wrapper around a C-style `nifti_image` struct that allows C++-style destruction
CRNifti::NiftiImageData	Wrapper class encapsulating a NIfTI data blob, with responsibility for handling data scaling and polymorphism
CRNifti::rgba32_t	Simple RGB(A) type encapsulating an 8-bit colour value with optional opacity, which can also be set or retrieved as a single 32-bit integer
CRNifti::SquareMatrix< NiftiType, ElementType, Order >	Class representing a numeric square matrix of a fixed order
CRNifti::NiftiImageData::TypeHandler	Abstract inner class defining the type-specific functions required in concrete subclasses
CRNifti::NiftiImageData::ConcreteTypeHandler< rgba32_t, alpha >
CRNifti::NiftiImageData::ConcreteTypeHandler< std::complex< ElementType >, false >
CRNifti::NiftiImageData::ConcreteTypeHandler< Type, alpha >	Concrete inner class template defining behaviour specific to individual data types
CRNifti::NiftiImageData::ConcreteTypeHandler< rgba32_t, alpha >
CRNifti::NiftiImageData::ConcreteTypeHandler< std::complex< ElementType >, false >
CRNifti::rgba32_t::ValueType
CRNifti::Vector< ElementType, Length >	A simple object-oriented wrapper around a fixed-length array
CRNifti::NiftiImage::Xform	Inner class representing an xform matrix, which indicates the orientation and other spatial properties of an image