D hackers requested. Dancing around postblit.

[Adam D. Ruppe via Digitalmars-d]

If you're willing to make it @system or @trusted, you can just 
copy the data and call postblit manually:

extern(C) @safe int printf(in char*);

struct S {
         ~this() { printf("dtor\n"); }
         this(this) { printf("postblit\n"); }

         @disable S opAssign(S s);
}

S[] data;
void emplace(Struct)(ref Struct val, size_t i) {
         // just blit the struct contents over
         // (same thing normal assign does anyway)
         (cast(ubyte*)&(data[i]))[0 .. Struct.sizeof] = 
(cast(ubyte*)&val)[0 ..  Struct.sizeof];
         // call postblit
         data[i].__postblit();
}

void main() {
         data.length = 1;
         S s;

         emplace(s, 0);
}



Since it is a template, attribute inference should take care of 
nothrow, etc.