What are some uses of template template parameters?
I\'ve seen some examples of C++ using template template parameters (that is templates which take templates as parameters) to do policy-based class design. What other uses do
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Here's another practical example from my CUDA Convolutional neural network library. I have the following class template:
templateclass Tensor which is actually implements n-dimensional matrices manipulation. There's also a child class template:
templateclass TensorGPU : public Tensor which implements the same functionality but in GPU. Both templates can work with all basic types, like float, double, int, etc And I also have a class template (simplified):
template class TT, class T> class CLayerT: public Layerweights; TT inputs; TT connection_matrix; } The reason here to have template template syntax is because I can declare implementation of the class
class CLayerCuda: public CLayerTwhich will have both weights and inputs of type float and on GPU, but connection_matrix will always be int, either on CPU (by specifying TT = Tensor) or on GPU (by specifying TT=TensorGPU).
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