3

我有以下课程:

typedef std::pair<boost::asio::ip::tcp::socket, boost::asio::ip::tcp::socket>  socket_pair;

class ConnectionPair {
private:
    socket_pair _sockPair;
public:
    ConnectionPair(boost::asio::io_service &ios);
}

如何在构造函数中初始化对中的套接字?以下将无法编译:

ConnectionPair::ConnectionPair(asio::io_service &ios):
    _ios(ios),  
    _sockPair(asio::ip::tcp::socket(ios), asio::ip::tcp::socket(ios)){
}

编辑:这是编译器错误。享受:

/boost_1_47_0/boost/asio/basic_io_object.hpp: In copy constructor ‘boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >::basic_socket(const boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >&)’:

/boost_1_47_0/boost/asio/basic_socket.hpp:43:1:   instantiated from ‘std::pair<_T1, _T2>::pair(const _T1&, const _T2&) [with _T1 = boost::asio::basic_stream_socket<boost::asio::ip::tcp>, _T2 = boost::asio::basic_stream_socket<boost::asio::ip::tcp>]’
/devel/msm1/connection.cpp:8:67:   instantiated from here
/boost_1_47_0/boost/asio/basic_io_object.hpp:163:3: error: ‘boost::asio::basic_io_object<IoObjectService>::basic_io_object(const boost::asio::basic_io_object<IoObjectService>&) [with IoObjectService = boost::asio::stream_socket_service<boost::asio::ip::tcp>, boost::asio::basic_io_object<IoObjectService> = boost::asio::basic_io_object<boost::asio::stream_socket_service<boost::asio::ip::tcp> >]’ is private
/boost_1_47_0/boost/asio/basic_socket.hpp:43:1: error: within this context
In file included from /boost_1_47_0/boost/asio.hpp:30:0,
4

3 回答 3

4

如果该类型是可复制构造的,那么您的代码就可以工作。我猜(并且只是猜测,因为您没有指定编译器错误)套接字不是可复制构造的。由于 std::pair 不允许就地工厂,因此您必须使您的对成为一对 boost::optional 并使用就地工厂。有关更多详细信息,请参阅boost 文档

于 2011-09-23T14:52:22.977 回答
3

boost::asio::ip::tcp::socket支持复制吗?我不会期待的。而且 an 中的类型std::pair必须是可复制的。

于 2011-09-23T14:53:47.307 回答
0

您可以像尝试做的那样初始化这对,但您的代码中还有一些其他错误。

  • 类声明末尾没有分号。
  • _ios 成员变量不存在。

不幸的是,我没有安装 boost,但这使用 G++ 4.1.2 为我编译

#include <utility>

typedef std::pair<int, int> socket_pair;

class ConnectionPair
{
private:
        socket_pair _sockPair;

public:
        ConnectionPair(const int x);
};

ConnectionPair::ConnectionPair(const int x):
        _sockPair(x, x)
{
}

int main(int argc, const char *argv[])
{
        ConnectionPair c(10);
}
于 2011-09-23T14:54:41.820 回答