vector<std::string> of commandline args

I have the need in my c++ program of modifying the command line args given certain conditions. This favors using a `vector<std::string>` instead of the current approach. ```c++ #include <subprocess.h> #include <initializer_list> #include <vector> char *convert(const std::string & s) { char *pc = new char[s.size()+1]; std::strcpy(pc, s.c_str()); return pc; } int cmd(std::initializer_list<std::string> args) { std::vector<char*> vc; std::transform(args.begin(), args.end(), std::back_inserter(vc), convert); // vc.push_back(NULL); struct subprocess_s subprocess; int result = subprocess_create(&vc[0], 0, &subprocess); if (0 != result) { printf("error occurred."); }; std::cout << "vc.size(): " << vc.size() << std::endl; for ( size_t i = 0 ; i < vc.size() ; i++ ) std::cout << vc[i] << std::endl; for ( size_t i = 0 ; i < vc.size() ; i++ ) delete [] vc[i]; return 0; } ``` The problem I have is that if I `push_back(NULL)` to add a `NULL` sentinel I get an error and it doesn't work as expected.. Do I have to modify `subprocess.h` itself with this approach and just drop the sentinel requirement or is there a way of making something like the above work?