VexCL is a vector expression template library for OpenCL/CUDA. It has been
created for ease of GPGPU development with C++. VexCL strives to reduce amount
of boilerplate code needed to develop GPGPU applications. The library provides
convenient and intuitive notation for vector arithmetic, reduction, sparse
matrix-vector products, etc. Multi-device and even multi-platform computations
are supported.

WWW: https://github.com/ddemidov/vexcl