Add Entity.add and .remove functions

src/entity.zig

@@ -78,16 +78,16 @@ pub fn Entity(comptime ctx: anytype) type {
         /// existing entity `.id` is specified but its `.name` doesn't match,
         /// an error is returned.
         ///
-        /// `add` is a tuple that specifies `Id`s added to the entity.
+        /// `ids` is a tuple that specifies `Id`s added to the entity.
         /// For example: `.{ Position, Velocity, .{ ChildOf, parent } }`.
         ///
         /// When adding components, they are just default-initialized.
         /// To set their values you'll need to use `set(...)` on the
         /// `Entity` returned from this function.
-        pub fn init(world: *World(ctx), config: Config, add: anytype) !Self {
+        pub fn init(world: *World(ctx), config: Config, ids: anytype) !Self {
             const meta = @typeInfo(@TypeOf(add));
             if (meta != .Struct or (meta.Struct.is_tuple == false and meta.Struct.fields.len > 0))
-                @compileError("Expected tuple or empty struct, got '" ++ @typeName(@TypeOf(add)) ++ "'");
+                @compileError("Expected tuple or empty struct, got '" ++ @typeName(@TypeOf(ids)) ++ "'");
             if (meta.Struct.fields.len > c.FLECS_ID_DESC_MAX)
                 @compileError("Adding more than FLECS_ID_DESC_MAX ids");
 
@@ -153,10 +153,10 @@ pub fn Entity(comptime ctx: anytype) type {
                 .use_low_id = config.use_low_id,
             });
 
-            inline for (add, 0..) |a, i|
+            inline for (ids, 0..) |a, i|
                 desc.add[i] = util.anyToId(ctx, a);
 
-            for (desc.add[0..add.len]) |i|
+            for (desc.add[0..ids.len]) |i|
                 if (c.ecs_id_is_pair(i) and c.ECS_PAIR_FIRST(i) == c.EcsChildOf)
                     if (config.parent != null or config.path != null)
                         return error.FoundChildOf;
@@ -261,10 +261,20 @@ pub fn Entity(comptime ctx: anytype) type {
 
         /// Returns whether this `Entity` has the specified value.
         ///
-        /// `value` must be convertible to an id. See also: `util.anyToId(...)`.
-        pub fn has(self: Self, value: anytype) bool {
-            const id = util.anyToId(ctx, value);
-            return c.ecs_has_id(self.world.raw, self.raw, id);
+        /// `id` must be convertible to an id. See also: `util.anyToId(...)`.
+        pub fn has(self: Self, id: anytype) bool {
+            const ecs_id = util.anyToId(ctx, id);
+            return c.ecs_has_id(self.world.raw, self.raw, ecs_id);
+        }
+
+        pub fn add(self: Self, id: anytype) void {
+            const ecs_id = util.anyToId(ctx, id);
+            c.ecs_add_id(self.world.raw, self.raw, ecs_id);
+        }
+
+        pub fn remove(self: Self, id: anytype) void {
+            const ecs_id = util.anyToId(ctx, id);
+            c.ecs_remove_id(self.world.raw, self.raw, ecs_id);
         }
 
         pub fn get(self: Self, comptime T: type) ?*const T {