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Carbon is a simple language embedded in C++. The syntax is a subset of Boost.Phoenix. Carbon has been implemented with Thrust in mind. Therefore its main purpose is to act as a lambda library for Thrust. Carbon makes it more convenient to specify simple functors as arguments to Thrust functions like thrust::transform and thrust::reduce. Here is an example :

SAXPY without Carbon

struct saxpy_functor : public thrust::binary_function<float,float,float>
{
    const float a;

    saxpy_functor(float _a) : a(_a) {}

    __host__ __device__
        float operator()(const float& x, const float& y) const { 
            return a * x + y;
        }
};

void saxpy_fast(float A, thrust::device_vector<float>& X, thrust::device_vector<float>& Y)
{
    // Y <- A * X + Y
    thrust::transform(X.begin(), X.end(), Y.begin(), Y.begin(), saxpy_functor(A));
}