[Bug c++/40664] New: Parse error declaring friend class using dependent template instance
trevor at scurrilous dot com
gcc-bugzilla@gcc.gnu.org
Mon Jul 6 19:43:00 GMT 2009
The following code fails to compile on GCC 4.3.3. It compiles on Intel C++ 11.1
and Comeau 4.3.10.1.
g++ -v -save-temps main.cpp
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.3-5ubuntu4'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3
--program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --enable-mpfr --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
/usr/lib/gcc/x86_64-linux-gnu/4.3.3/cc1plus -E -quiet -v -D_GNU_SOURCE
main.cpp -D_FORTIFY_SOURCE=2 -mtune=generic -fpch-preprocess -o main.ii
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.3.3/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/usr/include/x86_64-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.3
/usr/include/c++/4.3/x86_64-linux-gnu
/usr/include/c++/4.3/backward
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.3.3/include
/usr/lib/gcc/x86_64-linux-gnu/4.3.3/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
/usr/lib/gcc/x86_64-linux-gnu/4.3.3/cc1plus -fpreprocessed main.ii -quiet
-dumpbase main.cpp -mtune=generic -auxbase main -version -fstack-protector -o
main.s
GNU C++ (Ubuntu 4.3.3-5ubuntu4) version 4.3.3 (x86_64-linux-gnu)
compiled by GNU C version 4.3.3, GMP version 4.2.4, MPFR version 2.4.0.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: d9dd67dcc191271ac69fd2c05266cf9c
main.cpp:22: error: expected identifier before Â;Â token
main.cpp:22: error: friend declaration does not name a class or function
main.cpp: In member function ÂT Base<T>::InnerBase<D>::baseImpl() [with D =
Derived<int>::InnerDerived, T = int]Â:
main.cpp:27: instantiated from ÂT Derived<T>::InnerDerived::operation() [with
T = int]Â
main.cpp:45: instantiated from here
main.cpp:31: error: ÂT Derived<T>::InnerDerived::derivedHelper() [with T =
int]Â is private
main.cpp:11: error: within this context
main.cpp:
template <class T>
class Base
{
protected:
template <class D>
class InnerBase
{
protected:
T baseImpl()
{
return static_cast<D*>(this)->derivedHelper();
}
};
};
template <class T>
class Derived : public Base<T>
{
public:
class InnerDerived : public Base<T>::template InnerBase<InnerDerived>
{
friend class Base<T>::template InnerBase<InnerDerived>; // <--- error:
expected identifier before Â;Â token
public:
T operation()
{
return this->baseImpl();
}
private:
T derivedHelper()
{
return T(42);
}
};
InnerDerived makeInner() const
{
return InnerDerived();
}
};
int main(int argc, char* argv[])
{
return Derived<int>().makeInner().operation();
}
--
Summary: Parse error declaring friend class using dependent
template instance
Product: gcc
Version: 4.3.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: trevor at scurrilous dot com
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40664
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