https://d.puremagic.com/issues/show_bug.cgi?id=12180
Summary: NRVO with multiple return statements
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Simon <[email protected]> 2014-02-16 03:53:04
PST ---
In the following code, no return value optimization is performed because foo
contains multiple return statements. But it would be valid to do so, i.e.
bitcopy the appropriate value into the return value of foo without calling the
postblit (and destructor).
In C++, such optimization would be invalid in general. But in D, the struct is
guaranteed not to contain pointers to itself. Therefore structs can be moved
without destructor/postblit.
struct S
{
this(this) { writefln("copy"); }
}
S foo(bool x)
{
S a, b;
if(x) return a;
else return b;
}
void main() { foo(true); }
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