Summary: compiler could use move semantics for appending
                    temporaries to an array
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD

--- Comment #0 from Steven Schveighoffer <> 2011-06-21 
04:52:58 PDT ---
Currently, the following code:

import std.stdio;

struct S
   int x;
   this(this) { writeln("postblit"); }
   ~this() { writeln("dtor"); }

void main()
   S[] arr;
   arr ~= S();



But it could have move semantics.  However, the runtime function which appends
data does not know whether the given data to append is an rvalue or not.  For
example, the following cannot have move semantics:

S s;
s.x = 1;
arr ~= s;

So the compiler must give an additional flag (or call a separate runtime
function) when appending an rvalue.  When the compiler does this, flip the bug
to a druntime bug and assign it to me, and I'll fix the runtime.

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