I have a C function with signature double *fwht(double *a, int n). I have compiled the function as part of a shared library and I try to call it with ccall from Julia with ccall((:fwht, "./libmean.so"), Vector{Float64}, (Vector{Float64}, Int), rand(10_000), 10_000) However, I get a segmentation fa…

Using ccall with pointers in signature

nvenkov1 November 11, 2022, 4:15pm 5

Okay. The following works:

z_ptr = ccall((:fwht, "./libmean.so"), Ptr{Cdouble}, (Ptr{Cdouble}, Cint), rand(10_000), 10_000)
z = unsafe_wrap(Vector{Float64}, z_ptr, 10_000)

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