move_simple.cpp

std::vector<std::string> all_strings;

for(int i = 0; i < aLenght; ++i) {
  std::string result = aCallThatProducesAStr(i);
  // Note that push_back result will copy the contents of 
  // result to an new object that will be stored in the vector. 
  // all_strings.emplace_back(result);  
  
  // Since is the last use of result string object, move 
  // which is more efficient.
  all_strings.emplace_back(std::move(result));
  // Any use of result variable after the move is undefined behavior.
}