C.152: Never assign a pointer to an array of derived class objects to a pointer to its base

C.152:永遠不要將派生類數組的指針賦值給基類指針

Reason(原因)

Subscripting the resulting base pointer will lead to invalid object access and probably to memory corruption.

作為賦值結果的基類指針的下標運算會引起無效的對象訪問并可能發生內存破壞。

Example(示例)

struct B { int x; };struct D : B { int y; };void use(B*);D a[] = {{1, 2}, {3, 4}, {5, 6}};B* p = a; // bad: a decays to &a[0] which is converted to a B*p[1].x = 7; // overwrite D[0].yuse(a); // bad: a decays to &a[0] which is converted to a B*

Enforcement(實施建議)

• Flag all combinations of array decay and base to derived conversions.
• 提示所有數組退化和基類類型向派生類類型轉換的情況。
• Pass an array as a span rather than as a pointer, and don't let the array name suffer a derived-to-base conversion before getting into the span
• 使用span傳遞數組而不是指針，也不要再放入span之前讓數組名經過一次派生類向基類類型的轉換。

原文鏈接：

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c151-use-make_shared-to-construct-objects-owned-by-shared_ptrs

---

覺得本文有幫助？請分享給更多人。

更多精彩文章歡迎關注微信公眾號【面向對象思考】！

面向對象開發，面向對象思考！

總結

以上是生活随笔為你收集整理的基类数组存放派生类_永远不要将派生类数组赋值给基类类型指针的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。