How can you deep-copy a std.container.Array instance?
The actual array data is heap-allocated and reference-counted. Assignment and .dup only create additional references. Using a copy constructor yields an error: Array!Foo x; Array!Foo y = Array!Foo(x); Error: template std.container.Array!(Foo).Array.__ctor cannot deduce function from argument types !()(Array!(Foo)), candidates are: /opt/compilers/dmd2/include/std/container.d(2652): std.container.Array!(Foo).Array.__ctor(U)(U[] values...) if (isImplicitlyConvertible!(U, T)) /opt/compilers/dmd2/include/std/container.d(2670): std.container.Array!(Foo).Array.__ctor(Stuff)(Stuff stuff) if (isInputRange!Stuff && isImplicitlyConvertible!(ElementType!Stuff, T) && !is(Stuff == T[])) The question came up in a reddit discussion: http://www.reddit.com/r/programming/comments/2ipdpa/floss_weekly_311_the_d_language/cl4yv8w
