1. 问题

前阵子遇到个问题，需要传递接口的admin状态，是这么定义的：

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enum IfaceAdminStatus
{
	up,
	down
};

然后从API上获取的接口又是string类型：

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struct EtherIfaces
{
    std::string ifaceName;
    std::string adminState;

    EtherIfaces(const std::string &ifaceName_,
                    const std::string &adminState_): 
                    ifaceName(ifaceName_),
                    adminState(adminState_)
    {
    }

    EtherIfaces()
    {
    }

    ~EtherIfaces()
    {
    }
};

所以需要将string转enum处理。因为是C++小白，只能去论坛里找办法，然后再Stack Overflow上找到这个办法：

https://stackoverflow.com/questions/7163069/c-string-to-enum

2. 例子

记录下简单的实现：

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#include <iostream>
#include <string>
#include <boost/assign.hpp>

using namespace std;
using namespace boost;
enum IfaceAdminStatus
{
    up,
    down,
    unknown
};

map<string, IfaceAdminStatus> adminStatus = assign::map_list_of("up", up)("down", down)("unknown", unknown);

int main()
{
    string status = "up";
    cout << adminStatus[status] << endl;
    return 0;
}

输出：

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(base) phoenine@EvandeMacBook-Pro C_Study_1 % g++ -std=c++17 cpp_chapter_7.cpp -o test -I /opt/homebrew/Cellar/boost/1.75.0_1/include/
(base) phoenine@EvandeMacBook-Pro C_Study_1 % ./test
0