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I was receiving a strange error from gcc and cannot figure out why. I made the following example code to make the problem more clear. Basically, there is a class defined, for which I make its copy constructor and copy assignment operator private, to prevent calling them accidentally. #include <vector> #include <cstdio> using std::vector; class branch { public: int th; private: branch( const branch& other ); const branch& operator=( const branch& other ); public: branch() : th(0) {} branch( branch&& other ) { printf( "called! other.th=%d\n", other.th ); } const branch& operator=( branch&& other ) { printf( "called! other.th=%d\n", other.th ); return (*this); } }; int main() { vector<branch> v; branch a; v.push_back( std::move(a) ); return 0; } I expect this code to compile, but it fails with gcc. Actually gcc complains that "branch::branch(const branch&) is private", which as I understand shouldn't be called. The assignment operator works, since if I replace the body of main() with branch a; branch b; b = a; It will compile and run as expected. Is this a correct behavior of gcc? If so, what's wrong with the above code? Any suggestion is helpful to me. Thank you!

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