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未指向同一数组的指针相减

C++-Undefined-Behavior-46
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示例:

int a[10];
int b[10];
ptrdiff_t d = a - b;  // Undefined behavior

依据

ISO/IEC 14882:2003 5.7(5)-undefined ISO/IEC 14882:2011 5.7(5)-undefined

规则

ID_illPtrDiff
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