applyFront

Performs fun(st.front!d).

This functions is useful when st.front!d has not a common type and fails to compile.

Can be used instead of .Concatenation.front

@optmath
applyFront
(
size_t d = 0
alias fun
size_t dim
Slices...
)
(
Concatenation!(dim, Slices) st
)

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