digitalmars.D.bugs - [Issue 20468] New: emplace doesn't forward constructor arguments'
- d-bugmail puremagic.com (49/49) Dec 27 2019 https://issues.dlang.org/show_bug.cgi?id=20468
https://issues.dlang.org/show_bug.cgi?id=20468 Issue ID: 20468 Summary: emplace doesn't forward constructor arguments' (l/r)valueness Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: normal Priority: P1 Component: druntime Assignee: nobody puremagic.com Reporter: sahmi.soulaimane gmail.com `core.lifetime.emplace` always forwards constructor arguments by ref. example: ``` import core.lifetime : emplace; import std.stdio; struct A {} struct B { this()(auto ref A a) { static if (__traits(isRef, a)) writeln("copy"); else writeln("move"); } } void main() { B obj = void; A a; emplace(&obj, a); emplace(&obj, A()); } ``` output: --- copy copy --- expected output: --- copy move --- --
Dec 27 2019