On 04/03/2013 08:53 AM, John Colvin wrote:
> import core.memory : malloc;
> T x;
>
> T* pt = cast(T*)malloc(T.sizeof);
> *pt = x;
>
> note: this is not C malloc, the memory is requested from and managed by
> the GC.
That assignment will fail in general when the left-hand side has those
undetermined bits. std.conv.emplace is a safer option but it must be
used differently for classes.
import std.stdio;
import core.memory;
import std.conv;
T * makeNew(T)(T rhs)
{
static if (is(T == class)) {
static assert(false); // not implemented
} else {
T * p = cast(T*)GC.calloc(T.sizeof);
emplace!T(p, rhs);
return p;
}
}
struct S
{
int i;
}
void main()
{
writeln(*makeNew(42));
writeln(*makeNew(1.5));
writeln(*makeNew(S(1)));
}
The program should consider __traits(classInstanceSize) for classes.
Ali
