expr → ptr2d 关系

opencv2/cudev/expr 目录下的文件	包含 opencv2/cudev/ptr2d 目录下的文件
binary_func.hpp	traits.hpp
binary_func.hpp	transform.hpp
binary_op.hpp	glob.hpp
binary_op.hpp	gpumat.hpp
binary_op.hpp	texture.hpp
binary_op.hpp	traits.hpp
binary_op.hpp	transform.hpp
color.hpp	traits.hpp
color.hpp	transform.hpp
deriv.hpp	deriv.hpp
deriv.hpp	traits.hpp
expr.hpp	traits.hpp
per_element_func.hpp	lut.hpp
per_element_func.hpp	traits.hpp
per_element_func.hpp	transform.hpp
reduction.hpp	traits.hpp
unary_func.hpp	traits.hpp
unary_func.hpp	transform.hpp
unary_op.hpp	glob.hpp
unary_op.hpp	gpumat.hpp
unary_op.hpp	texture.hpp
unary_op.hpp	traits.hpp
unary_op.hpp	transform.hpp
warping.hpp	remap.hpp
warping.hpp	resize.hpp
warping.hpp	traits.hpp
warping.hpp	warping.hpp