Re: ffi.sizeof and variable length structs (VLS)
- From: Aleksandar Kordic <alexandarkordic@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Thu, 24 May 2018 18:06:30 +0200
On Thu, May 24, 2018 at 3:12 PM, Konstantin Stefanov <cstef@xxxxxxxxxxx>
wrote:
Why not accept int a[] as if it were 'int a[?]'
Those 2 declarations are not equivalent.
You can prepare declaration in text if that is more intuitive to you:
local ffi = require("ffi")
local exact_c_definition = string.format([[
struct vls_s {
int n;
int a[%d];
}
]], 2)
ffi.cdef(exact_c_definition)
local vls = ffi.new("struct vls_s")
local s1 = ffi.sizeof(vls)
local s2 = ffi.sizeof("struct vls_s")
print(s1)
print(s2)
It prints
12
12
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