C++ 在 GCC 上使用已删除的函数，但在 MSVC 上没有

Question

以下是在 msvc 而不是 gcc 上编译的。为什么？

game_tracker.cpp：

#include "stdafx.hpp"
#include "game_tracker.hpp"
#include "basic_game_server.hpp"
#include "basic_session.hpp"
#include "api_session.hpp"
#include "protocols.hpp"

using namespace boost::asio;
using namespace std;

namespace games_zone{

    game_tracker::game_tracker(unsigned short port) : tracker_(io_service(thread::hardware_concurrency())),
        api_(io_service(thread::hardware_concurrency())),
        acceptor_(api_, ip::tcp::endpoint(ip::tcp::v4(), port), false),
        socket_(api_)
    {
        tracker_work_ = new boost::asio::io_service::work(tracker_);
        api_work_ = new boost::asio::io_service::work(api_);

        protocols::hl_game_server gs(boost::asio::ip::address_v4::from_string("89.44.246.184"), 27015);
        add(gs);
    }

    ...
}

game_tracker.hpp：

#pragma once

#include "basic_game_server.hpp"

namespace games_zone{
    class game_tracker :
        private boost::noncopyable
    {
    public:
        game_tracker(unsigned short);
        ~game_tracker();
        void run();
    private:
        boost::asio::io_service tracker_;
        boost::asio::io_service api_;
        boost::asio::ip::tcp::acceptor acceptor_;
        boost::asio::ip::tcp::socket socket_;
        boost::asio::io_service::work* tracker_work_;
        boost::asio::io_service::work* api_work_;
        std::vector<basic_game_server*> servers_;

        void add(basic_game_server&);
        void do_accept();
    };
}

gcc 错误：

root@ubuntu:~/gz_tracker/build# make
Scanning dependencies of target gz_tracker
[ 16%] Building CXX object games_zone/CMakeFiles/gz_tracker.dir/game_tracker.cpp.o
/root/gz_tracker/games_zone/game_tracker.cpp: In constructor ‘games_zone::game_tracker::game_tracker(short unsigned int)’:
/root/gz_tracker/games_zone/game_tracker.cpp:16:15: error: use of deleted function ‘boost::asio::io_service::io_service(const boost::asio::io_service&)’
   socket_(api_)
               ^
In file included from /usr/local/include/boost/asio/basic_io_object.hpp:19:0,
                 from /usr/local/include/boost/asio/basic_socket.hpp:20,
                 from /usr/local/include/boost/asio/basic_datagram_socket.hpp:20,
                 from /usr/local/include/boost/asio.hpp:21,
                 from /root/gz_tracker/games_zone/stdafx.hpp:10,
                 from /root/gz_tracker/games_zone/game_tracker.cpp:1:
/usr/local/include/boost/asio/io_service.hpp:185:7: note: ‘boost::asio::io_service::io_service(const boost::asio::io_service&)’ is implicitly deleted because the default definition would be ill-formed:
 class io_service
       ^
In file included from /usr/local/include/boost/asio/io_service.hpp:23:0,
                 from /usr/local/include/boost/asio/basic_io_object.hpp:19,
                 from /usr/local/include/boost/asio/basic_socket.hpp:20,
                 from /usr/local/include/boost/asio/basic_datagram_socket.hpp:20,
                 from /usr/local/include/boost/asio.hpp:21,
                 from /root/gz_tracker/games_zone/stdafx.hpp:10,
                 from /root/gz_tracker/games_zone/game_tracker.cpp:1:
/usr/local/include/boost/asio/detail/noncopyable.hpp:32:3: error: ‘boost::asio::detail::noncopyable::noncopyable(const boost::asio::detail::noncopyable&)’ is private
   noncopyable(const noncopyable&);
   ^
In file included from /usr/local/include/boost/asio/basic_io_object.hpp:19:0,
                 from /usr/local/include/boost/asio/basic_socket.hpp:20,
                 from /usr/local/include/boost/asio/basic_datagram_socket.hpp:20,
                 from /usr/local/include/boost/asio.hpp:21,
                 from /root/gz_tracker/games_zone/stdafx.hpp:10,
                 from /root/gz_tracker/games_zone/game_tracker.cpp:1:
/usr/local/include/boost/asio/io_service.hpp:185:7: error: within this context
 class io_service
       ^
/root/gz_tracker/games_zone/game_tracker.cpp:16:15: error: use of deleted function ‘boost::asio::io_service::io_service(const boost::asio::io_service&)’
   socket_(api_)
               ^
make[2]: *** [games_zone/CMakeFiles/gz_tracker.dir/game_tracker.cpp.o] Error 1
make[1]: *** [games_zone/CMakeFiles/gz_tracker.dir/all] Error 2
make: *** [all] Error 2

我使用 boost 1.55（当前版本）并在 Microsoft Visual Studio 2013 上编译和运行。 我从这个错误中了解到api_ 无法绑定到explicit basic_stream_socket(boost::asio::io_service & io_service);

我错了什么？这是 GCC 错误吗？

Answer 1

这两行：

tracker_(io_service(thread::hardware_concurrency())),
api_(io_service(thread::hardware_concurrency())),

您正在创建一个临时的 io_service 并将其复制到您的成员变量中（这是不允许的，因为复制构造函数是私有的）。

试试吧

tracker_(thread::hardware_concurrency()),
api_(thread::hardware_concurrency()),

Answer 2

检查您选择的 C++ 标准是否相同。在调试模式和发布模式下。可能类型、函数或命名空间未在所选 C++ 标准上实现或存在。

就我而言，我有以下错误（示例）：

• 'std::literals' 尚未声明

using namespace std::literals::string_literals;

• std::random_device 出现“使用已删除函数”错误{}

std::random_device device = std::random_device{}  

就我而言

• 调试模式 -std=c++17
• 发布模式 -std=c++14（由于 C++14 中缺少函数、类型或名称空间而导致的错误/您需要 C++17。）大量错误。

发布模式更改为 C++17。一切正常，0 个错误 0 个警告。

选择 2017 c ++ 标准不是强制性的，您必须选择您喜欢或必要的标准之一，该标准已经实现了您项目所需的所有功能。

更新 通过远程 Linux 编译在 Clion Windows 2018.3 上测试。

使用 -std=c++11

使用 -std=c++17

C++ 是一个不断发展的标准：2003 年之后是 2011 年 (C++11)，然后是 2014 年 (C++14)，现在我们有了 2017 年 (C++17)，我们正在为 2020 年 (C++ 20) 。许多事情正在发生变化，它们已被弃用，其他功能是新的。如果你想要最新的更新，你应该使用最新的标准，如果你的软件有可能被弃用的代码，那么你必须使用创建它的标准。