Prepare query failed: what(): out of memory

[jamjpan]

Prepare query failed:
select route, idx_last_visited_node, next_node_distance from vehicles where  id = ?
terminate called after throwing an instance of 'std::runtime_error'
  what():  out of memory
Aborted (core dumped)

Reason:

An RSAlgorithm class is initialized before a Cargo class. The RSAlgorithm class tries to prepare statements against the Cargo DB, but the DB is not created yet. sqlite3_errmsg in dbsql.cc > prepare_stmt(2) receives a bad pointer, hence we get a misleading error message (see https://stackoverflow.com/questions/43321649/failed-from-sqlite3-prepare-v2-error-is-out-of-memory).

Workaround:

Initialize Cargo before RSAlgorithm. For example:

/* BAD */
MyAlg A;  // extends RSAlgorithm
Cargo(options);

/* GOOD */
Cargo(options);
MyAlg A;