无法在Mac上访问std vector iterator _Ptr [英] Can't access std vector iterator _Ptr on Mac

问题描述

在Visual Studio上，这段代码就像一个魅力：

On Visual Studio this snippet of code works like a charm:

auto child = node.childs.begin();
    while (child != node.childs.end()) {
        vector<int> siblings;
        for (auto it : node.childs){
            if (it != *child._Ptr)siblings.push_back( it );
        }
        if (CheckSomething( tree, *child._Ptr, siblings ) > 0) {
            //delete that child
            child = node.childs.erase( child );
        }
        else ++child;
    }

但是在XCode上使用相同的代码我遇到了_Ptr不存在的错误？是不是具有相同结构的std库？为什么会这样？

but with the same code on XCode I got errors like _Ptr is non existent? is not the same std library with the same structures? why this happen?

File.cpp:1745:22: No member named '_Ptr' in 'std::__1::__wrap_iter<int *>'

提前致谢

推荐答案

规范没有定义这样的成员变量。 _Ptr 是特定于实现的（在本例中为MSVC特定的）成员变量，在其他实现中可能存在也可能不存在。

The specification defines no such member variable. _Ptr is an implementation-specific (in this case MSVC-specific) member variable that may or may not exist on other implementations.

通常，以下划线开头的名称是指特定于实现的成员。如果您希望代码可移植或不在编译器版本之间中断，请不要访问它们。

Generally names starting with underscores refer to implementation-specific members. Don't ever access those, if you want your code to be portable or not to break between compiler versions.

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