Value Semantics vs Pointer Semantics — Measured
Determine when value returns are cheaper than pointer returns, where the crossover lies, and how receiver type affects optimization.
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What this chapter teaches
Pass by pointer to avoid copying; pointers are faster.
a pointer that escapes costs a heap allocation + GC scan; for small/medium structs the copy is usually cheaper. The right question is does this pointer escape, not is it a pointer.
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