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<h1 class="main">Structs with reference fields</h1>
<p>Structs with references require explicitly setting the initial value to a
reference value unless the struct already defines its own initial value.</p>
<p>Zero-value references, or nil pointers, will <strong>NOT</strong> be supported in the future,
for now data structures such as Linked Lists or Binary Trees that rely on reference
fields that can use the value <code>0</code>, understanding that it is unsafe, and that it can
cause a panic.</p>
<p>A null reference has to be written as <code>unsafe { nil }</code>: outside <code>unsafe</code>, the compiler
rejects direct <code>nil</code>, <code>0</code> and <code>voidptr(0)</code> constants where a non-option reference is expected.
The same rule applies to explicitly typed global initializers when globals are enabled.
Raw <code>voidptr</code> targets, C declarations, <code>.c.v</code> files and translated code retain their
C interop rules. Comparisons with null values and optional references remain accepted.</p>
<div class="language-v">struct Node {
a &Node
b &Node = unsafe { nil } // Auto-initialized to nil, use with caution!
}
// Reference fields must be initialized unless an initial value is declared.
// Nil is OK but use with caution, it's a nil pointer.
foo := Node{
a: unsafe { nil }
}
bar := Node{
a: &foo
}
baz := Node{
a: unsafe { nil }
b: unsafe { nil }
}
qux := Node{
a: &foo
b: &bar
}
println(baz)
println(qux)
</div>
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