TFieldPtrAccessor

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References

Syntax

template<typename T>  
class TFieldPtrAccessor  
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template<typename T> class TFieldPtrAccessor

Remarks

Helper to provide backward compatibility when converting a raw pointer into accessors.

The helper is trying hard to mimic's a raw pointer field functionality without breaking compatibility for existing code.

The helper's getter are all const and return a non-const pointer. This is because accessing a pointer field inside a const struct will not make that pointer const like we typically do for accessors. Since we want to mimic the behavior of a public field as much as possible, we offer that same functionality.

The helper supports being captured in a lamba as seen below and will become a const copy of the value at the capture's moment. ex: CapturedValue = Object.OnceARawFieldBecomingAnAccessor { // ExtractedValue contains a copy that will not change even if the original Object.OnceARawFieldBecomingAnAccessor changes. const Class* ExtractedValue = CapturedValue; });

This helper also supports taking a nullptr in its constructor so it properly supports conditional like such ex: ExtractedValue* Val = (Condition) ? Object.OnceARawFieldBecomingAnAccessor : nullptr;

A comforming compiler is supposed to try both conversions (nullptr -> TFieldPtrAccessor and TFieldPtrAccessor -> nullptr) but MSVC without the /permissive- flag will only try to cast nullptr into a TFieldPtrAccessor, which has to succeed to avoid breaking compabitility with existing code.

For more info, please refer to https://docs.microsoft.com/en-us/cpp/build/reference/permissive-standards-conformance?view=vs-2019#ambiguous-conditional-operator-arguments

Constructors

Operators