C++核心準(zhǔn)則??ES.61:使用delete[]銷毀數(shù)組,使用delete銷毀對象

ES.61: Delete arrays using?delete[]?and non-arrays using?delete

ES.61:使用delete[]銷毀數(shù)組，使用delete銷毀對象

Reason（原因）

That's what the language requires and mistakes can lead to resource release errors and/or memory corruption.

這是C++語言的要求，如果用錯會導(dǎo)致資源釋放錯誤或者內(nèi)存破壞。

Example, bad（反面示例）

void f(int n)
{
    auto p = new X[n];   // n default constructed Xs
    // ...
    delete p;   // error: just delete the object p, rather than delete the array p[]
}

Note（注意）

This example not only violates the?no naked?new?rule?as in the previous example, it has many more problems.

示例代碼不僅違反了前面示例中的禁止暴露的new規(guī)則，還有更多其他錯誤。

Enforcement（實(shí)施建議）

• If the?new?and the?delete?are in the same scope, mistakes can be flagged.

• 如果new和delete同屬一個作用域，錯誤可以被標(biāo)記。

• If the?new?and the?delete?are in a constructor/destructor pair, mistakes can be flagged.

• 如果new和delete分別位于構(gòu)造函數(shù)和析構(gòu)函數(shù)，錯誤可以被標(biāo)記。

原文鏈接

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#es61-delete-arrays-using-delete-and-non-arrays-using-delete

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