Manually assigning a built-in mesh???

Hello,
I know that using

gameobject.GetComponent<MeshFilter> ().mesh = meshValue;

is a good way to assign a mesh to the object, but how do I gain access to all the built-in meshes that Unity has (like Cube, Sphere, Cylinder, etc.)? I wish there was a UnityBuiltInShapes.Cube feature.

 

http://docs.unity3d.com/ScriptReference/GameObject.CreatePrimitive.html

 

Code (csharp):

1.  
2. var cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
3. var mesh = cube.GetComponent<MeshFilter>().mesh;
4.  

 

Thank you.