Question: how to use e.modified() in a query?

[nneesshh]

I build a query and iterate the components with each method,
in the each method call back, I update the entity component data and cal "e.modifiyed()",

but it raise an assert because "ecs_table_lock" with the query. How to solve this?

[Sander Mertens]

The assert is protection against accidentally changing the contents the iterator is iterating over. The fix is to defer the operations, which you can do like this:

world.defer_begin();
q.each( ... );
world.defer_end();