我在一个命名空间 xxxx 中声明了一个类，但它变成了 xxxx::xxxx

Question

#ifndef _H_WEBSERVER_ENV_H_
#define _H_WEBSERVER_ENV_H_

#include "singleton.h"
#include <string>
#include <map>
#include <vector>


namespace WebServer{

class ServerEnv
{
public:
    bool init(int argc, char** argv);

  //  std::string getAbsolutePath(const std::string& path) const;
    // std::string getAbsoluteWorkPath(const std::string& path) const;
    // std::string getConfigPath();

private:
    std::string m_program;
    std::string m_exe;
    std::string m_cwd;
};

typedef WebServer::Singleton<ServerEnv> EnvMgr;

}

#endif

源文件

#include "env.h"
#include "log.h"
#include <string.h>
#include <iostream>
#include <iomanip>
#include <unistd.h>
#include <stdlib.h>
#include "config.h"

namespace WebServer
{
static WebServer::Logger::ptr g_logger = WEBSERVER_LOG_NAME("system");

bool ServerEnv::init(int argc, char** argv)
{
    char link[1024] = {0};
    char path[1024] = {0};
    sprintf(link,"/proc/%d/exe", getpid());
    readlink(link, path, sizeof(path));

    m_exe = path;

    auto pos = m_exe.find_last_of("/");
    m_cwd = m_exe.substr(0,pos) + "/";
    m_program = argv[0];

    return true;

    
}
/*
std::string Env::getAbsolutePath(const std::string& path)
{
    if(path.empty())
        return "/";
    if(path[0] == '/')
        return path;
    return m_cwd + path;
}


std::string Env::getAbsoluteWorkPath(const std::string& path)
{
    if(path.empty())
        return "/";
    if(path[0] == '/')
        return path;
    
    static WebServer::ConfigVar<std::string>::ptr g_server_work_path = 
            WebServer::Config::Lookup<std::string>("server.work_path");
    return g_server_work_path->getValue() + "/" + path;
}

std::string Env::getConfigPath()
{
    return getAbsolutePath(get("c","conf"));
}
*/
}

但我收到此错误：

/home/li/WebServer/src/env.cc:12:8: error: ‘Logger’ in namespace ‘WebServer::WebServer’ does not name a type
 static WebServer::Logger::ptr g_logger = WEBSERVER_LOG_NAME("system");
        ^
/home/li/WebServer/src/env.cc:14:43: error: definition of ‘bool WebServer::ServerEnv::init(int, char**)’ is not in namespace enclosing ‘WebServer::ServerEnv’ [-fpermissive]
 bool ServerEnv::init(int argc, char** argv)
                                           ^
/home/lizhichao/WebServer/src/env.cc:59:1: error: expected ‘}’ at end of input
 }

为什么命名空间“WebServer”变成命名空间“WebServer::WebServer”