gtest测试框架fixture test编译出错

gtest测试固件测试编译错误。
头文件

#include<stdint.h>
#include<map>
#include<set>
//using namespace std;
typedef std::map<uint64_t, std::map<uint32_t, uint64_t> > gid2UidsMap_t;
namespace server
{
    namespace yc_groupmedia
    {
        class LinkServer
        {
            public:
            uint32_t m_usersNum;
            uint32_t m_serverid;
       gid2UidsMap_t m_users;
            public:
      LinkServer():m_usersNum(0), m_serverid(0){ }
            LinkServer(uint32_t serverid):m_usersNum(0), m_serverid(serverid){ }


        bool addUser(uint64_t gid, uint32_t uid, uint64_t ts);
        bool delUser(uint64_t gid, uint32_t uid);

        };
    }
}

源文件

 #include"LinkServer.h"
using namespace server;
using namespace server::yc_groupmedia;

bool LinkServer::addUser(uint64_t gid, uint32_t uid, uint64_t ts)
{

    std::map<uint32_t, uint64_t>& tmp = m_users[gid];
    std::map<uint32_t, uint64_t>::iterator uid2tsItr = tmp.find(uid);
    if (uid2tsItr == tmp.end())
    {
        tmp[uid] = ts;
        m_usersNum++;

    }
    else
    {
        uid2tsItr->second = ts;
    }   
    return true;
}

bool LinkServer::delUser(uint64_t gid, uint32_t uid)
{

    bool remove = false;
    gid2UidsMap_t::iterator itCh = m_users.find(gid);
    if (itCh != m_users.end())
    {
        if (itCh->second.find(uid) != itCh->second.end())
        {
            itCh->second.erase(uid);
            m_usersNum--;
            remove = true;
        }
        if (itCh->second.empty())
        {
            m_users.erase(itCh);
        }
    }
    return remove;
}

固件测试代码如下

#include<iostream>
#include<time.h>
#include<limits>
#include"LinkServer.h"
#include"gtest/gtest.h"

using namespace server;
using namespace server::yc_groupmedia;

class LinkServerTest : public testing::Test
{
protected:
        virtual void SetUp()
          {          

              linkdServer->addUser(100, 1, (uint32_t)time(NULL) );
              linkdServer->addUser(100, 2, (uint32_t)time(NULL) );
              linkdServer->addUser(100, 3, (uint32_t)time(NULL) );
              linkdServer->addUser(100, 4, (uint32_t)time(NULL) );
              linkdServer->addUser(101, 4, (uint32_t)time(NULL) );
         }

         uint32_t serverId=123456;
         LinkServer linkdServer(serverId);        

      public:

  };
 TEST_F(LinkServerTest, addUserTest)
  {
      EXPECT_EQ(5, linkdServer->m_usersNum);
      EXPECT_TRUE(linkdServer->addUser(100,3,(uint32_t)time(NULL)));
        EXPECT_EQ(5, linkdServer->m_usersNum);
      EXPECT_EQ(123456, linkdServer->m_serverid);
      EXPECT_EQ(time(NULL), linkdServer->m_users[100][3]);
  }

编译错误如下：

求解决