C++ – websocket++不依赖boost，基于独立Asio编译方法

1 websocket++

WebSocket++ 是一个跨平台开源（BSD 许可证）仅标头 C++ 库，它实现RFC6455（WebSocket 协议）和RFC7692（WebSocket 压缩扩展），可基于WebSocket++编写Websocket客户端和服务器，其中Websocket++网络I/O主要是基于Asio库完成，另外基于OpenSSL库进行加密连接，zlib库实现压缩。

websocket++官网：https://www.zaphoyd.com/projects/websocketpp/

websocket++文档：https://docs.websocketpp.org/

2 websocket++不依赖boost库，基于独立Asio编译

2.1 官方文档

在websocket++的官方文档中是这样写的，

In order to remain compact and improve portability, the WebSocket++ project strives to reduce or eliminate external dependencies where possible and appropriate. WebSocket++ core has no dependencies other than the C++11 standard library. For non-C++11 compilers the Boost libraries provide drop in polyfills for the C++11 functionality used.

WebSocket++ implements a pluggable data transport component. The default component allows reduced functionality by using STL iostream or raw byte shuffling via reading and writing char buffers. This component has no non-STL dependencies and can be used in a C++11 environment without Boost. Also included is an Asio based transport component that provides full featured network client/server functionality. This component requires either Boost Asio or a C++11 compiler and standalone Asio. As an advanced option, WebSocket++ supports custom transport layers if you want to provide your own using another library.

意思是说WebSocket++ 核心除了 C++11 标准库之外没有任何依赖项，但是如果编译器不支持C++11，就需要依赖Boost库。编译Websocket++要么是依赖Boost库，要么就是使用C++11编译器且使用独立的Asio，也就是no-boost Asio，这个我之前的文章中有介绍过：C++ – Asio和Boost.Asio的区别。

2.2 为什么要使用websocket++加独立Asio的方案？

websocket++默认情况下是需要依赖boost的库，而boost非常的大且编译比较耗时。为了项目轻量化，所以我更倾向于不依赖于boost。

2.3 如何正确编译websocket++加独立Asio的组合