Query:contains

Returns whether a specific Entity was matched by this query.

Like other query methods, results of this function are only updated when calling ECS:update.

Usage

query:contains(entity)

Arguments

Name	Type	Description
entity	Entity	The entity which may or may not be matched by this query.

Returns

Name	Type	Description
contained	boolean	True if the entity was matched by this query.

Examples

local Health = Class("Health", crystal.Component);
local HealthSystem = Class("HealthSystem", crystal.System);

HealthSystem.init = function(self)
  self.query = self:add_query({ "Health" });
end

HealthSystem.do_things = function(self)
  for entity in pairs(self.query:entities()) do
    assert(self.query:contains(entity));
  end
end