Are there any cases where it is incorrect to replace push_back with emplace_back?

Question

Can I break a valid C++03 program by replacing std::vector::push_back with emplace_back and compiling it with C++ 11 compiler? From reading e

Answer 1

If you don't have crazy side-effects in copy constructor of the objects that you hold in your vector, then no.

emplace_back was introduced to optimise-out unnecessary copying and moving.