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Kenta MurataAntoine Pitrou
5b116ab1752
Kenta Murata authored and Antoine Pitrou committed 0b9fad379fe
ARROW-3515: [C++] Introduce NumericTensor class

This commit defines the new NumericTensor<T> class as a subclass
of Tensor class. NumericTensor<T> extends Tensor class by adding
a member function to access element values in a tensor.

I want to use this new feature for writing tests of SparseTensor in #2546.

Author: Kenta Murata <mrkn@mrkn.jp>

Closes #2759 from mrkn/tensor_element_access and squashes the following commits:

37f0bb4a <Kenta Murata> Add tests for column-major strides
14fa5279 <Kenta Murata> Remove needless cases
16464615 <Kenta Murata> Introduce NumericTensor class