如何在Visual Studio C ++ 17中还原auto_ptr [英] How to restore auto_ptr in Visual Studio C++17

问题描述

此博客页面提到Visual Studio删除了一些标准功能:

This blog page mentions that Visual Studio removes some std features:

https://blogs.msdn.microsoft.com/vcblog/2017/12/08/c17-feature-removals-and-deprecations/

我有一个项目，该项目使用了一些现在使用C ++ 17功能的C ++库.该项目还使用了第三方库websocketpp( https://github.com/zaphoyd/websocketpp )仍然使用一些现在已删除的功能.例如auto_ptr和binary_function.我收到编译器错误，指出它们不是'std'的成员.

I have a project that consumes some C++ libraries that now use C++17 features. The project also consumes a third party library websocketpp (https://github.com/zaphoyd/websocketpp) that still uses some now removed features. eg auto_ptr and binary_function. I'm getting compiler errors that they are not a member of 'std'.

以上博客提到，可以使用细粒度控件来恢复已删除的功能.我想我可以用它来使这个项目现在编译.从长远来看，我会看到有关将websocketpp升级到C ++ 17或用其他替换它的事情.

The blog above mentions that removed features can be restored using a fine grain control. I'm thinking I could use that to get this project to compile for now. Longer term I will see about upgrading websocketpp to C++17 or replacing it with something else.

但是，恢复功能的神奇之处是什么?我需要#define吗?如果是这样，怎么办?

But, what is the magic to restore features? Is there something I need to #define? If so, what?

推荐答案

在VS2017 v15.5中，基于项目的/std:c ++ 17设置，有条件地将其排除在外.您可以通过强制基础宏值来强制将其包括在内.两种基本方法可以做到这一点:

In VS2017 v15.5 it is conditionally excluded, based on the project's /std:c++17 setting. You can force it to be included by forcing the underlying macro value. Two basic ways to do this:

1. 项目>属性> C/C ++>预处理程序>预处理程序定义，然后添加 _HAS_AUTO_PTR_ETC = 1 .对所有配置和平台都这样做.
2. 如果您使用预编译的标头，则可能希望在此定义宏.在任何#include之前，插入 #define _HAS_AUTO_PTR_ETC 1 .

1. Project > Properties > C/C++ > Preprocessor > Preprocessor Definitions and add _HAS_AUTO_PTR_ETC=1. Do so for all configurations and platforms.
2. If you use a precompiled header then you probably favor defining the macro there. Before any #includes, insert #define _HAS_AUTO_PTR_ETC 1.

当心"ETC"，您还将设置已弃用的random_shuffle()和unary_function<>.预测未来很困难，但这可能会在未来一段时间发挥作用.

Beware of the "ETC", you'll also slurp the deprecated random_shuffle() and unary_function<>. Predicting the future is difficult, but this is probably going to work for a while to come.

这篇关于如何在Visual Studio C ++ 17中还原auto_ptr的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！