FEmitter::TryInput

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Description

Retrieves the value from the given input, if present. A null reference otherwise. Note: it does not report an error if the value is missing. If the expression is marked MIR_OnDemandInputRequest and the dependency hasn't been built yet, sets Pending and returns poison, use UE_MIR_CHECKPOINT to defer. It is safe to pass returned value to other Emitter functions as argument even if null. For instance, the following is safe and idiomatic

FValueRef Value = Emitter.CheckIsArithmetic(Emitter.TryInput(&A)); UE_MIR_CHECKPOINT(Emitter); if (Value) { /* handle case when value is provided */ }

Keep in mind that a reference can be null (its Value is null) or invalid (which means that it's null OR poison).

FValueRef TryInput  
(  
    const FExpressionInput * Input  
)  
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FValueRef TryInput (     const FExpressionInput * Input )