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understand undefined value semantics

facebook/yoga
Based on 2 comments
C++

Before modifying initialization patterns or removing static variables, investigate the semantic meaning of undefined values and object lifetimes in the existing codebase. What appears to be a memory leak or improper initialization may be intentional design.

Null Handling C++

Reviewer Prompt

Before modifying initialization patterns or removing static variables, investigate the semantic meaning of undefined values and object lifetimes in the existing codebase. What appears to be a memory leak or improper initialization may be intentional design.

Key considerations:

  • Static variables with process lifetime are not memory leaks
  • Undefined values (like YGUndefined) may be semantically different from zero initialization
  • Prefer proper C++ initialization over manual memory operations, but verify behavioral compatibility

Example of proper investigation:

// Before changing this:
static YGConfigRef defaultConfig = YGConfigNew();  // Not a leak - process lifetime

// Or this:
memset(&(node->getLayout()), 0, sizeof(YGLayout));

// Investigate: Does the constructor initialize differently?
node->getLayout() = {};  // May initialize with YGUndefined instead of 0
// If tests break, understand why before forcing zero values

Always verify that your changes preserve the intended semantics, especially when dealing with undefined states, static lifetimes, or special sentinel values.

2
Comments Analyzed
C++
Primary Language
Null Handling
Category

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