I thought you might Im writing many wrapper functions to C functions that
take multiple C.char*. All of these require a defer statement to free the C
string when the wrapper function terminates. Im absolutely sure Im going to
miss one or more of these out, so I was wondering if I could get hold of
the defer list, then I could encapsulate the construction with the defer in
a function.
e.g. roughly :
func NewCString(s string, deferList List) *C.char {
cs := C.CString(s)
deferList.PushBack(func() { C.free(cs) }
return cs
}
Then in an *imagined world* I could write my wrapper simply as :
func wrapper(s1 string, s2 string, s3 string) {
deferList := runtime.DeferList()
return C.inner(NewCString(s1,deferList), NewCString(s2,deferList),
NewCString(s2,deferList))
}
Basically, I cant seem to find a clean solution to ensure all these C.char*
are 100% freed... swig allows me to wrap the C.char* with string, but swig
is pretty awkward to use especially when wrapping the libraries I have. Im
currently preferring cgo which seems much simpler and cleaner, but I dont
have the equivalent of swigs typemaps to ensure all allocs are correctly
freed... :o(
On Wednesday, October 19, 2016 at 8:41:25 PM UTC+1, Pietro Gagliardi
(andlabs) wrote:
>
> What do you want to do with it?
>
> On Oct 19, 2016, at 3:31 PM, andrew...@miracl.com <javascript:> wrote:
>
> Hi,
>
> This is probably a long shot, but is it possible to get a reference to the
> list of functions that the 'defer' statement populates? Is it exposed
> and/or is it specific?
>
> Andy
>
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