On Sat, Jun 8, 2013 at 10:33 AM, Bodo Kaiser <[email protected]> wrote:
> Hello,
>
> can somebody give me an example of how to use the free_callback in
> node::Buffer::New(char * data, size_t length, free_callback callback, void *
> hint)?
>
> https://github.com/joyent/node/blob/master/src/node_buffer.cc#L110
>
> Regards,
> Bodo
// Contrived example that zeroes the memory on release.
struct Allocation {
size_t size;
char data[1];
};
void FreeCallback(char* data, void* hint) {
Allocation* a = static_cast<Allocation*>(hint);
assert(data == a->data);
memset(a->data, 0, a->size);
free(a);
}
void Foo() {
const size_t size = 1024;
Allocation* a = malloc(sizeof(*a) + size - 1);
// NULL check omitted for brevity.
a->size = size;
Buffer* buf = Buffer::New(a->data, a->size, FreeCallback, a);
// do something with the buffer
}
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