Mateusz Łoskot ab4c686970 [numeric] std::extent not usable to obtain size of kernel_1d_fixed (#320) ...

Use of `std::extent` was introduced in PR #200 but it turns out as
not applicable for `std::array` or derived types (e.g. `kernel_1d_fixed`).
This led to obtaining invalid size of `kernel_1d_fixed` and erroneous
results of the rows and columns convolution.
This change replaces `std::extent` with new public constant member
`kernel_1d_fixed::static_size`.

Since `kernel_1d_fixed` is derived from `std::array`, the Alternative
could be to use `std::tuple_size` specialization for `std::array`.

Add static assertion to require that kernel size must be odd to
ensure validity at the center.

2019-07-04 20:45:33 +02:00

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