c++ - 绑定(bind)到新初始化器中的引用的临时对象的生命周期是多少？

Question

来自 [class.temporary]工作草案，C++ 编程语言标准:

(6.12) — A temporary bound to a reference in a new-initializer ([expr.new]) persists until the completion of the full-expression containing the new-initializer.

[Note 7: This might introduce a dangling reference. — end note]

[Example 5:

struct S { int mi; const std::pair<int,int>& mp; };
S a { 1, {2,3} };
S* p = new S{ 1, {2,3} };       // creates dangling reference

— end example]

是否意味着临时对象 {2,3}绑定(bind)到引用成员 mp的 S一直持续到表达式 new S { 1, {2,3} } 的计算, 或直到表达式 S* p = new S{ 1, {2,3} } 的计算?

Answer 1

全表达是S* p = new S{ 1, {2,3} } .