Ref Fields and Scoped Lifetime Tracking

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Ref Fields and Scoped Lifetime Tracking

C# 11 introduced 'ref fields' within 'ref structs', allowing stack-allocated structures to hold references to other variables. To prevent dangling references, the 'scoped' keyword ensures that a reference cannot escape the current method or be assigned to a field with a longer lifetime, enabling safe, pointer-free high-performance memory management.

snippet.csharp
csharp
public ref struct ReferenceTracker {
    public ref int Value;
    
    public void Update(scoped ref int newValue) {
        // Error if newValue has a shorter lifetime than the struct
        this.Value = ref newValue; 
    }
}
 
public void Process() {
    int local = 10;
    var tracker = new ReferenceTracker();
    tracker.Update(ref local); // Valid: local lives as long as tracker
}

Breakdown

public ref struct ReferenceTracker

A stack-only structure that can contain ref fields (C# 11 feature).

public ref int Value;

A field that stores a reference to an integer, not just the value.

scoped ref int newValue

Ensures the reference 'newValue' does not outlive the scope of the method call.

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Ref Fields and Scoped Lifetime Tracking

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