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DbEnv* penv = nullptr;
Db* db = nullptr;
db_set<unsigned long long, ElementHolder<unsigned long long>> test_set;
 
int main(int argc, char* argv[]) {
   penv = open_env(...);
   open_db(penv, "test.db", ....);
   test_set = {db, penv};
 
	call_other_functions(....);
	call_other_functions(....);
 
	test_set = {};
	close_db(penv, db);
	close_env(penv);
 
   return 0;
}

prog.cpp:2:1: error: ‘DbEnv’ does not name a type
 DbEnv* penv = nullptr;
 ^~~~~
prog.cpp:3:1: error: ‘Db’ does not name a type
 Db* db = nullptr;
 ^~
prog.cpp:4:1: error: ‘db_set’ does not name a type
 db_set<unsigned long long, ElementHolder<unsigned long long>> test_set;
 ^~~~~~
prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:7:4: error: ‘penv’ was not declared in this scope
    penv = open_env(...);
    ^~~~
prog.cpp:7:20: error: expected primary-expression before ‘...’ token
    penv = open_env(...);
                    ^~~
prog.cpp:7:11: error: ‘open_env’ was not declared in this scope
    penv = open_env(...);
           ^~~~~~~~
prog.cpp:8:29: error: expected primary-expression before ‘...’ token
    open_db(penv, "test.db", ....);
                             ^~~
prog.cpp:8:4: error: ‘open_db’ was not declared in this scope
    open_db(penv, "test.db", ....);
    ^~~~~~~
prog.cpp:9:4: error: ‘test_set’ was not declared in this scope
    test_set = {db, penv};
    ^~~~~~~~
prog.cpp:9:16: error: ‘db’ was not declared in this scope
    test_set = {db, penv};
                ^~
prog.cpp:11:23: error: expected primary-expression before ‘...’ token
  call_other_functions(....);
                       ^~~
prog.cpp:11:2: error: ‘call_other_functions’ was not declared in this scope
  call_other_functions(....);
  ^~~~~~~~~~~~~~~~~~~~
prog.cpp:12:23: error: expected primary-expression before ‘...’ token
  call_other_functions(....);
                       ^~~
prog.cpp:15:2: error: ‘close_db’ was not declared in this scope
  close_db(penv, db);
  ^~~~~~~~
prog.cpp:16:2: error: ‘close_env’ was not declared in this scope
  close_env(penv);
  ^~~~~~~~~

Standard output is empty