On Wednesday, 21 December 2016 at 17:49:22 UTC, kinke wrote:
Basic stuff such as this is appropriately tested. The named
return value optimization is enforced by D (incl. unoptimized
builds), so behavior doesn't change by this optimization. It's
you who changed the behavior by removing the if.
On 12/21/2016 07:01 AM, Eugene Wissner wrote:
> Isn't an optimization that changes the behavior bad? I had a crash in
> the code where the destructor did something meaningfull, freed the
> memory (the same pointer) twice.
Sounds like you ended up with two objects that owned the same resource.
On Wednesday, 21 December 2016 at 18:02:54 UTC, bauss wrote:
It removes an unnecessary allocation for the returning copy of
the struct, as the return value is never used. Hence why it's
pointless that it would be compiled anyway.
That's incorrect, it doesn't have anything to do with the
On Wednesday, 21 December 2016 at 15:01:20 UTC, Eugene Wissner
wrote:
On Wednesday, 21 December 2016 at 14:15:06 UTC, John C wrote:
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
This prints 3 times "Destruct" with dmd 0.072.1. If I remove
the if block, it prints
On Wednesday, 21 December 2016 at 15:01:20 UTC, Eugene Wissner
wrote:
On Wednesday, 21 December 2016 at 14:15:06 UTC, John C wrote:
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
This prints 3 times "Destruct" with dmd 0.072.1. If I remove
the if block, it prints
On Wednesday, 21 December 2016 at 14:15:06 UTC, John C wrote:
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
This prints 3 times "Destruct" with dmd 0.072.1. If I remove
the if block, it prints "Destruct" only 2 times - the behavior
I'm expecting. Why?
Possibly to do
On Wednesday, 21 December 2016 at 14:15:06 UTC, John C wrote:
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
This prints 3 times "Destruct" with dmd 0.072.1. If I remove
the if block, it prints "Destruct" only 2 times - the behavior
I'm expecting. Why?
Possibly to do
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
This prints 3 times "Destruct" with dmd 0.072.1. If I remove
the if block, it prints "Destruct" only 2 times - the behavior
I'm expecting. Why?
Possibly to do with named return value optimisation.
On Wednesday, 21 December 2016 at 12:32:51 UTC, Nicholas Wilson
wrote:
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
Consider we have a function that returns a struct. So for
example:
import std.stdio;
struct A {
~this() {
writeln("Destruct");
}
}
A
On Wednesday, 21 December 2016 at 11:45:18 UTC, Eugene Wissner
wrote:
Consider we have a function that returns a struct. So for
example:
import std.stdio;
struct A {
~this() {
writeln("Destruct");
}
}
A myFunc() {
auto a = A(), b = A();
if (false) {
return a;
Consider we have a function that returns a struct. So for example:
import std.stdio;
struct A {
~this() {
writeln("Destruct");
}
}
A myFunc() {
auto a = A(), b = A();
if (false) {
return a;
}
return b;
}
void main() {
myFunc();
}
This prints 3
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