http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46691
Summary: Null pointer in template deduction Product: gcc Version: 4.4.5 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: ilpoil...@hotmail.com Have a look at the following code: template <typename T> struct identity { typedef T type; }; template <typename T> void f(T t, typename identity<T>::type* p) { } int main() { int a = 0; f(a, 0); return 0; } Compiling this on GCC 4.4.5 gives the following error: g++ test.cpp test.cpp: "error: no matching function for call to 'f(int&, int)'" The 0 should match a null pointer. The code is accepted by Visual Studio 2008, 2010, and Comeau C++, all in strict mode. g++ -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.4-8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --with-arch-32=i586 --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 4.4.5 20100728 (prerelease) (Debian 4.4.4-8)