After reading https://golang.org/cmd/cgo/#hdr-Passing_pointers and https://blog.golang.org/c-go-cgo, I am trying to understand if there are valid ways to pass between Go and C complicated data structures with (potentially) lots of pointers.
At the moment this is just a speculative question, but it could quickly become useful both for my Go interpreter gomacro and for other similar tasks (I am thinking at least about https://github.com/gijit/gi) that need to pass arbitrary data structures between compiled Go code and the interpreter itself (which may not be written in Go). The question is: is it allowed to take the unsafe.Pointer returned by C.malloc() and convert it to a pointer to a Go struct type? In practice: is the following code valid ? Thanks, Max // ----------------------------------------------------------------------------------------- package main /* #include <string.h> */ import "C" import ( "fmt" "unsafe" ) type List struct { Node int Next *List } func mallocList() *List { const n = unsafe.Sizeof(List{}) p := C.malloc(C.ulong(n)) C.memset(p, C.int(n), 0) return (*List)(p) } func main() { // if this code is valid, x can contain C pointers and can be passed freely to C code, // thus exchanging complicated data structured between Go and C x := mallocList() x.Next = mallocList() fmt.Printf("%#v\n", x) fmt.Printf("%#v\n", x.Next) } -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
