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如果 nothrow new 返回 nullptr，是否调用构造函数？

[英]Is constructor called if nothrow new return nullptr?

原文 2021-04-26 12:22:08 3 1 c++/ pointers/ exception/ new-operator/ nothrow

If I use new and get std::bad_alloc compiler do not call constructor because of exception.如果我使用new并获取std::bad_alloc编译器不要因为异常调用构造函数。 But how does it works with the nothrow new cause we get pointer in every case?但是它如何与nothrow new一起工作，因为我们在每种情况下都得到指针？ Is there special paragraph in standard for this case?这种情况的标准中是否有特殊段落？

1 个解决方案

[expr.new]/16 ... if the allocation function returns null, initialization shall not be done, the deallocation function shall not be called, and the value of the new-expression shall be null. [expr.new]/16 ... if the allocation function returns null, initialization shall not be done, the deallocation function shall not be called, and the value of the new-expression shall be null.

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