try {
 str = get_par_str();
 // ...
}

try { 
 auto ptr = get_instance();
 // ...
} 
catch (...) { /* empty or std::cout */ } 

try {
 func1();
 func2();
 func3();
 func4();
} 
catch(std::bad_alloc &ba) { /* something */ }
catch(...) { /* something */ } 

func() {

 try { 
  auto str = get_par_str();
  // ...

  auto ptr = get_instance();
  // ...

  auto obj = get_some_obj();
  // ...


 } // automatic calls destructors for solve exceptions
 catch (std::bad_alloc &ba) { std::cout << ba.what() << std::endl; /* something */ } 
 catch (std::runtime_error &rt) { std::cout << rt.what() << std::endl; /* something */ } 
 catch (std::exception &ex) { std::cout << ex.what() << std::endl; /* something  */ } 
 catch (...) { std::cout << "Unknown exception"<< std::endl; /* something  */ } 

 // ...
}

func() {


 {
  errcode1_t errcode1;
  std::string str
  if (!(errcode1 = get_par_str(&str))) {
   switch(errcode1) {
    case err1_1: /* */ break;
    case err1_2: /* */ break;
    case err1_3: /* */ break;
    default: std::cout << "Unknown error"<< std::endl; break;
   }
  } else {
   // ...

   errcode2_t errcode2;
   std::shared_ptr<T> ptr;
   if (!(errcode2 = get_instance(&ptr))) {
    switch(errcode2) {
     case err2_1: /* */ break;
     case err2_2: /* */ break;
     case err2_3: /* */ break;
     default: std::cout << "Unknown error"<< std::endl; break;
    }
   } else {
    // ...

    errcode3_t errcode3;
    T2 obj;
    if (errcode3 = get_some_obj(&obj)) {
     switch(errcode3) {
      case err3_1: /* */ break;
      case err3_2: /* */ break;
      case err3_3: /* */ break;
      default: std::cout << "Unknown error"<< std::endl; break;
     }
    } else {
     // ...
   }
  }
 } // automatic calls destructors for solve errors


 // ...
}