[Codename Milan] Delegating constructors not working with explicit constructors

[Codename Milan] Delegating constructors not working with explicit constructors by Rutix

Closed

as Fixed

Type:	Bug
ID:	770526
Opened:	11/8/2012 1:50:57 PM
Access Restriction:	Public

Workaround(s)

view

User(s) can reproduce this bug

The code:

struct X {
    explicit X(int n) : value(n) {}

    // error C2664: 'X::X(const X &)' : cannot convert parameter 2 from 'int' to 'const X &'
    // works without the explicit keyword in X(int) constructor
    X() : X(0) {}

    int value;
};

int main()
{
    X x;
}

This is not correct. It should compile fine and compiles in gcc-4.5.1 and other compilers supporting C++11.

Details (expand)

Visual Studio 2012

struct X {
    explicit X(int n) : value(n) {}

    // error C2664: 'X::X(const X &)' : cannot convert parameter 2 from 'int' to 'const X &'
    // works without the explicit keyword in X(int) constructor
    X() : X(0) {}

    int value;
};

int main()
{
    X x;
}

English

Windows 7 SP1

English

error C2664: 'X::X(const X &)' : cannot convert parameter 2 from 'int' to 'const X &'

Should compile without errors.

File Name	Submitted By	Submitted On	File Size
bug-repro.zip	Rutix	11/11/2012	5 KB
bug-repro.zip	Rutix	11/11/2012	5 KB

Posted by Microsoft on 11/21/2012 at 10:08 AM

Hi:
Thanks for reporting the issue.
A fix for this issue has been checked into the compiler sources. The fix should show up in the next release of Visual C++.

Xiang Fan
Visual C++ Team

Posted by Microsoft on 11/12/2012 at 2:33 AM

Thanks for your update. We are rerouting this issue to the appropriate group within the Visual Studio Product Team for triage and resolution. These specialized experts will follow-up with your issue.

Posted by Rutix on 11/11/2012 at 1:15 PM

I attached a demo project. The project is basicly nothing more then the code I have above pasted in.

Posted by Microsoft on 11/9/2012 at 12:38 AM

Thank you for submitting feedback on Visual Studio and .NET Framework. We are unable to reproduce the issue with the steps you provided.

Could you please give us a demo project to demonstrate this issue so that we can conduct further research?

Please submit this information to us within 4 business days. We look forward to hearing from you with this information.

Microsoft Visual Studio Connect Support Team

Posted by Microsoft on 11/8/2012 at 2:50 PM

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)