C negative array index

this is my struct :

struct Node {
    struct Node* data;
    struct Node* links[4];

assuming there is no padding, does Node->links[-1] guaranteed to be pointing on Node::data ?


No guarantee; this is undefined behaviour:

  • Compiler-dependent structure padding
  • Standard only defines array indexing between 0 and length (inclusive)
  • Possible strict-aliasing violation

In practice, it's quite possible that you will end up pointing at data, but any attempts to access it will result in UB.

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