================
@@ -49,14 +49,17 @@ class SyntheticChildrenFrontEnd {
 
   virtual size_t GetIndexOfChildWithName(ConstString name) = 0;
 
-  // this function is assumed to always succeed and it if fails, the front-end
-  // should know to deal with it in the correct way (most probably, by refusing
-  // to return any children) the return value of Update() should actually be
-  // interpreted as "ValueObjectSyntheticFilter cache is good/bad" if =true,
-  // ValueObjectSyntheticFilter is allowed to use the children it fetched
-  // previously and cached if =false, ValueObjectSyntheticFilter must throw
-  // away its cache, and query again for children
-  virtual bool Update() = 0;
+  enum class CacheState { Invalid, Valid };
----------------
clayborg wrote:

As long as we document with headerdoc what each value means, I am good. Then 
users can use code navigation to take them to the definition and find the 
explanation.

https://github.com/llvm/llvm-project/pull/80167
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