C++ Replace函数封装

void replaceAll(std::string& str, const std::string& from, const std::string& to)
{
 size_t start_pos = 0;
 while((start_pos = str.find(from, start_pos)) != std::string::npos){
  str.replace(start_pos, from.length(), to);
  start_pos += to.length(); // In case 'to' contains 'from', like replacing 'x' with 'yx'
 }
}