According to http://dlang.org/const3.html any modification of
immutable data causes undefined behaviour. Now I want to
initialise a struct with immutable members in some malloc'd
memory and found the emplace function. I came up with the
following code:
import core.stdc.stdlib;
import std.conv;
struct Point {
immutable double x;
immutable double y;
}
void main() {
void* a = malloc(Point.sizeof);
Point* p = cast(Point*) a;
emplace!Point(p, 1.0, 2.0);
}
this compiles and runs fine. Because emplace expects a typed
pointer, it actually modifies (*p).x and (*p).y
As far as I understand, this causes undefined behavior.
Are there any (safe) alternatives to this code other than making
the immutable members mutable?
