Absence of conversion operator-function to pointer to function in lambda-expression.

Absence of conversion operator-function to pointer to function in lambda-expression. by Сыроежка

Closed

as Fixed

Type:	Bug
ID:	724616
Opened:	2/12/2012 12:19:56 PM
Access Restriction:	Public
Moderator Decision:	Sent to Engineering Team for consideration

Workaround(s)

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User(s) can reproduce this bug

According to the paragraph 5.1.2 "Lambda expressions" p.6 of the C++ 2011 Standard "The closure type for a lambda-expression with no lambda-capture has a public non-virtual non-explicit const conversion function to pointer to function having the same parameter and return types as the closure type’s function call operator. The value returned by this conversion function shall be the address of a function that, when invoked, has the same effect as invoking the closure type’s function call operator."
However the VC++ 2010 compiler issues error "error C2440: инициализация: невозможно преобразовать "`anonymous-namespace'::<lambda0>" в "void (__cdecl *)(int)"
Для выполнения данного преобразования нет доступного оператора преобразования, определенного пользователем, или вызов оператора невозможен"

Details (expand)

Visual Studio 2010 SP1

This code is not compiled by VC++ 2010
#include <iostream>

int main()
{
void ( *f )( int ) = []( int x ) { std::cout << x << " "; };
f( 10 );
return ( 0 );

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Windows 7

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Compilation error

error C2440: инициализация: невозможно преобразовать "`anonymous-namespace'::<lambda0>" в "void (__cdecl *)(int)"
Для выполнения данного преобразования нет доступного оператора преобразования, определенного пользователем, или вызов оператора невозможен

The code shall be compiled successfully and the lambda expression shall be converted to function pointer.

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Posted by Microsoft on 2/13/2012 at 12:52 PM

Thank you for reporting this issue to Microsoft. We're glad to say that it's already been fixed and the fix will be available in the next release of the compiler.

Tanveer Gani
Visual C++ Team

Posted by MS-Moderator08 [Feedback Moderator] on 2/12/2012 at 10:20 PM

Thank you for submitting feedback on Visual Studio 2010 and .NET Framework. Your issue has been routed to the appropriate VS development team for investigation. We will contact you if we require any additional information.

Posted by MS-Moderator01 on 2/12/2012 at 12:41 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)