c++ - Why does Xcode think gsl::span needs two template arguments? -

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i'm getting familiar gsl, , wrote following simple example test out how gsl::span works. xcode seems have problems can see here:

enter image description here

this compiles , runs fine, should, @ same time xcode thinks gsl::span needs template argument, quite strange. i've never seen compiler or ide give actual error (not warning) , compile fine.

gsl::span can deduce size of array, second template argument wouldn't necessary. if change argument type gsl::span<int,5>, errors go away, of course not solution.


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