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[Bug c++/51818] New: [C++0x] Name mangling error using lambda expressions in GCC47
- From: "gccearlyadopter at trash-mail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 11 Jan 2012 01:46:35 +0000
- Subject: [Bug c++/51818] New: [C++0x] Name mangling error using lambda expressions in GCC47
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51818
Bug #: 51818
Summary: [C++0x] Name mangling error using lambda expressions
in GCC47
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: gccearlyadopter@trash-mail.com
The following program fails to compile:
#include <iostream>
#include <functional>
using std::cout;
using std::endl;
typedef std::function<void()> void_fun;
struct foo
{
void_fun bar = [=]() {
cout << "foo::bar" << endl;
};
void_fun baz = [=]() {
cout << "foo::baz" << endl;
};
};
int main()
{
foo f;
f.bar();
f.baz();
}
GCC 47 says: ... FATAL:Symbol
__ZSt4moveIRNUlvE_EEONSt16remove_referenceIT_E4typeEOS3_ already defined
Furthermore, it's not possible to call bar() from baz:
minimal_mangling_example.cpp: In lambda function:
minimal_mangling_example.cpp:12:5: error: invalid use of non-static data member
'foo::bar'
minimal_mangling_example.cpp:15:9: error: from this location
Unless the this pointer is passed and used explicitly:
void_fun baz = [this]() {
this->baz();
};
That's wrong, too. The standard says in 5.1.2.7 ... "transforming id-
expressions referring to non-static class members into class member access
expressions using (*this) ...". Thus, baz should be able to call bar without
using this:
void_fun baz = [=]() {
bar();
};
Best regards.