llvm::TrackingVH

Declared in <llvm/IR/ValueHandle.h>

TrackingVH is designed for situations where a client needs to hold a handle to a Value (or subclass) across some operations which may move that value, but should never destroy it or replace it with some unacceptable type.

It is an error to attempt to replace a value with one of a type which is incompatible with any of its outstanding TrackingVHs.

It is an error to read from a TrackingVH that does not point to a valid value. A TrackingVH is said to not point to a valid value if either it hasn't yet been assigned a value yet or because the value it was tracking has since been deleted.

Assigning a value to a TrackingVH is always allowed, even if said TrackingVH no longer points to a valid value.

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