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std::shared_ptr::operator[]

STD：：共享[医]PTR：：操作员。[]

element_type& operator​(since C++17)

索引到存储指针所指向的数组中。

如果存储的指针为NULL或idx是阴性的。

如果T%28的模板参数shared_ptr%29是数组类型U[N]，，，idx必须少于N，否则行为就没有定义。

参数

idx-the array index

返回值

引用idx-数组的第四元素，即，get()[i]

例外

%280%29

评语

何时T不是数组类型，则未指定是否声明此函数。如果声明了该函数，则未指定其返回类型是什么，只是声明%28(虽然不一定是函数的定义%29)保证是合法的。

例

另见

getreturns the stored pointer (public member function)

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