SaZ>const std::vector<int> v = [&]()
SaZ>{
SaZ>  std::vector<int> a;
SaZ>  // Runtime initialization code
SaZ>  while(...)
SaZ>    if(...)
SaZ>      a.push_back(...);
SaZ>  return a;
SaZ>}();

SaZ>v - тут будет константой.
SaZ>