http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50929
Bug #: 50929 Summary: [C++0x] Wrong function selected for overload with template and rvalue reference Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: jarr...@cse.unsw.edu.au When choosing between a constructor A(const A& a) and template <typename T> A(T&& t) given an object of type A&, the compiler chooses the second function. For the following code: class A { public: A() : value(0) {} A(const A& rhs) : value(1) { } A(A&& rhs) : value(2) { } template <typename T> A(T&& t) : value(3) { } int value; }; int main() { A a; A b = a; return b.value; } compiled with: g++ -std=gnu++0x rvalue_deduction.cpp then running: ./a.out echo $? the output is 3 I expect the output to be 1, not 3. Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/home/jarrydb/current/soft/install-latest/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: /home/jarrydb/current/soft/src/gcc-git/configure --prefix=/home/jarrydb/current/soft/install-latest --disable-multilib --enable-languages=c,c++ Thread model: posix gcc version 4.7.0 20111027 (experimental) (GCC)