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

C.152:永遠(yuǎn)不要將派生類數(shù)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(jié)果的基類指針的下標(biāo)運(yùn)算會(huì)引起無效的對(duì)象訪問并可能發(fā)生內(nèi)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(shí)施建議)

• Flag all combinations of array decay and base to derived conversions.
• 提示所有數(shù)組退化和基類類型向派生類類型轉(zhuǎn)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(shù)組而不是指針，也不要再放入span之前讓數(shù)組名經(jīng)過一次派生類向基類類型的轉(zhuǎn)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(qǐng)分享給更多人。

更多精彩文章歡迎關(guān)注微信公眾號(hào)【面向?qū)ο笏伎肌?#xff01;

面向?qū)ο箝_發(fā)，面向?qū)ο笏伎?#xff01;

總結(jié)

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?jī)?nèi)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(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。