static struct Foo { ~this() pure nothrow @nogc { if (_ptr) ++*_ptr; } int* _ptr; } int[4] refs = [0, 1, 2, 3]; Foo[4] src = [Foo(&refs[0]), Foo(&refs[1]), Foo(&refs[2]), Foo(&refs[3])]; Foo[3] dst = void; auto res = moveEmplaceSome(src[], dst[]); assert(res.length == 2); import std.algorithm.searching : all; assert(src[0 .. 3].all!(e => e._ptr is null)); assert(src[3]._ptr !is null); assert(dst[].all!(e => e._ptr !is null));
Same as moveSome but assumes all elements in tgt are uninitialized. Uses moveEmplace to move elements from src over elements from tgt.