http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55680
Bug #: 55680
Summary: [C++11] Member specialization with lambda is rejected
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: qufa...@gmail.com
==== CONTENTS OF speclambda.cpp ====
template <class T> struct X {
static void (* code ) ();
};
template <> void (* X<int>::code ) () = [](){};
int main () { return 0; }
====================================
==== OUTPUT OF g++-4.7 -std=c++11 ====
speclambda.cpp:4:42: error: explicit specialization of non-template ‘<lambda>’
======================================
It succeeds if I specialize the whole struct instead of just the one member.
The same error occurs if the type of 'code' is std::function<void ()>.
The same error occurs during any kind of static member specialization whose
initializer contains a lambda (such as an initializer that calls a constructor
with a lambda as an argument).
I'm not 100% certain this is valid code, but even if it is invalid, the error
message is quite misleading.
==== OUTPUT OF g++-4.7 -v ====
Using built-in specs.
COLLECT_GCC=g++-4.7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.7.2-11precise2' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64 --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 4.7.2 (Ubuntu/Linaro 4.7.2-11precise2)
==============================
