Is it somehow possible to reuse the memory of an object?
My current idea is:
----
@nogc
T emplace(T, Args...)(ref T obj, auto ref Args args) nothrow if
(is(T == class)) {
if (obj is null)
return null;
enum size_t SIZE = __traits(classInstanceSize, T);
void[] buf = (cast(void*) obj)[0 .. SIZE];
buf = typeid(T).init[];
//obj = cast(T) buf.ptr;
static if (args.length)
obj.__ctor(args);
return obj;
}
Foo f = new Foo(42);
Foo f2 = emplace(f, 23);
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But is there a more elegant way to do that? Maybe without calling
the internal __ctor?
In C++ you can do that:
----
#include <iostream>
class Foo {
public:
int id;
explicit Foo(int _id) : id(_id) { }
};
int main() {
Foo* f = new Foo(42);
std::cout << f << ':' << f->id << std::endl;
new (f) Foo(23);
std::cout << f << ':' << f->id << std::endl;
delete f;
}
----
