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Add undef to Vector allocations #29184

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Sep 15, 2018
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Add undef to Vector allocations #29184

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6 changes: 3 additions & 3 deletions doc/src/manual/calling-c-and-fortran-code.md
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Original file line number Diff line number Diff line change
Expand Up @@ -130,7 +130,7 @@ Here is a slightly more complex example that discovers the local machine's hostn

```julia
function gethostname()
hostname = Vector{UInt8}(128)
hostname = Vector{UInt8}(undef, 128)
ccall((:gethostname, "libc"), Int32,
(Ptr{UInt8}, Csize_t),
hostname, sizeof(hostname))
Expand Down Expand Up @@ -820,7 +820,7 @@ function sf_bessel_Jn_array(nmin::Integer, nmax::Integer, x::Real)
if nmax < nmin
throw(DomainError())
end
result_array = Vector{Cdouble}(nmax - nmin + 1)
result_array = Vector{Cdouble}(undef, nmax - nmin + 1)
errorcode = ccall(
(:gsl_sf_bessel_Jn_array, :libgsl), # name of C function and library
Cint, # output type
Expand Down Expand Up @@ -973,7 +973,7 @@ Other supported conventions are: `stdcall`, `cdecl`, `fastcall`, and `thiscall`
signature for Windows:

```julia
hn = Vector{UInt8}(256)
hn = Vector{UInt8}(undef, 256)
err = ccall(:gethostname, stdcall, Int32, (Ptr{UInt8}, UInt32), hn, length(hn))
```

Expand Down