Compiling the following program: int printf(const char *fmt, ...);
class MyCompare { public: MyCompare() { } bool operator() (const int a, const int b) const { return a > b; } }; template<class Comp> class Other { public: Other (const Comp &c) : c_(c) { } void* doSomething(); private: Comp c_; }; template<class Comp> void* Other<Comp>::doSomething() { return &c_; } int main(int argc, char **argv) { MyCompare c; Other<MyCompare> other(c); printf("%p\n", other.doSomething()); return 0; } yields the following warning: test.cc: In function 'int main(int, char**)': test.cc:14: warning: 'c' is used uninitialized in this function test.cc:27: note: 'c' was declared here when compiled with the following command line: g++ -Wall -c -O2 test.cc However, c is initialized by the no argument constructor (further class MyCompare does not actually have any member variables to initialize). -- Summary: Compiler warns about uninitialized variable that is an object with a constructor Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: nvachhar at google dot com GCC build triplet: i686-unknown-linux-gnu GCC host triplet: i686-unknown-linux-gnu GCC target triplet: i686-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38851