Capturing variable

I seem to run into this challenge often, I want to create an immutable map to use in a lambda. Obviously the lambda requires me to capture the variable and im not sure the most performant way of doing that. I wrote a simple int key as a quick test. Is there a better way of doing this, i don't see another way of doing this. Any help would be appreciated

var biomeTypeMappings = _biomeTypeMappings; // Capture variable !!

Code (CSharp):

1.  
2.  
3. // this wil be guid to BiomeTypeMappingsData
4. private readonly  NativeHashMap<int, BiomeTypeMappingsData> _biomeTypeMappings = new NativeHashMap<int, BiomeTypeMappingsData>(12, Allocator.Persistent)
5. {
6.     #region BiomeType
7.     {
8.         3111138,// TropicalRainForest
9.         new BiomeTypeMappingsData(){BiomeTypeIndex = 1}
10.     },
11.     {
12.         9510956,// TropicalDryForest
13.         new BiomeTypeMappingsData(){BiomeTypeIndex = 2}
14.     },
15.     {
16.     //...
17.     #endregion
18. };
19.  

Code (CSharp):

1.  
2. var biomeTypeMappings = _biomeTypeMappings; // Capture variable !!
3.  
4. JobHandle deptBiomeFromTemperatureAndPrecipitation =
5.     Entities
6.         .WithReadOnly(biomeTypeMappings)
7.         .ForEach((
8.             Entity entity,
9.             ref TileBiomeComponent tb,
10.             in TileTemperatureComponent tt,
11.             in TilePrecipitationComponent tp) =>
12.         {
13.  
14.             // ....
15.             var isFound = biomeTypeMappings.TryGetValue(key, out BiomeTypeMappingsData biomeType);
16.             tb.IndexBiome = biomeType.BiomeTypeIndex;
17.             tb.IndexDataRow = 0;// PlanetTextureDataTableMapping.GetDataRowIndex(key);
18.         }).ScheduleParallel(Dependency);
19.  
20.  

 

There is no performance downside on doing that.

 

So no extra copying, its just getting a pointer?

 

Can't tell for sure if there is no extra copying, but they behave as pointers (if you modify the copy it will modify the original). In any case, there is no way to avoid that copying, this is how you would do with IJobChunk anyway.

 

I was wondering the same, a bit annoying to have to come up with a slightly different name or add a prefix. When you do this with a native container you're just copying the pointers and the allocator(and the safety stuff if that's enabled).