Question

我有使用boost asio库的课程：

部首：

class TestIOService {

public:
    void makeConnection();
    static TestIOService getInst();

private:
    TestIOService(std::string address);
    std::string address;
    // boost::asio::io_service service;
};

默认地将Impl：

#include <boost/asio/ip/address.hpp>
#include <boost/asio/ip/udp.hpp>
#include "TestIOService.h"

void TestIOService::makeConnection() {
    boost::asio::io_service service;
    boost::asio::ip::udp::socket socket(service);
    boost::asio::ip::udp::endpoint endpoint(boost::asio::ip::address::from_string("192.168.1.2"), 1234);
    socket.connect(endpoint);
    socket.close();
}

TestIOService::TestIOService(std::string address) : address(address) { }

TestIOService TestIOService::getInst() {
    return TestIOService("192.168.1.2");
}

主要：

int main(void)
{
    TestIOService service = TestIOService::getInst();
    service.makeConnection();
}

当我使用此行在makeConnection方法中定义服务时：

boost::asio::io_service service;

没有问题，但当我将它作为类字段成员（在代码中注释掉）时，我收到此错误：

注意：'TestIOService :: TestIOService（TestIOService＆amp;＆amp;）'是隐含的删除，因为默认定义不正确： class TestIOService {

Answer 1

io_service无法复制。

您可以将其包装在shared_ptr<io_service>中快速分享，但您应该首先重新考虑设计。

如果您的类需要可复制，那么逻辑上不包含io_service对象

E.g。以下示例确实创建了两个不共享连接的测试类实例：

<强> Live On Coliru

#include <boost/asio.hpp>
#include <boost/make_shared.hpp>
#include <iostream>

class TestIOService {

public:
    void makeConnection();
    static TestIOService getInst();

private:
    TestIOService(std::string address);
    std::string address;

    boost::shared_ptr<boost::asio::ip::udp::socket> socket;
    boost::shared_ptr<boost::asio::io_service> service;
};

void TestIOService::makeConnection() {
    using namespace boost::asio;
    service = boost::make_shared<io_service>();
    socket  = boost::make_shared<ip::udp::socket>(*service);
    socket->connect({ip::address::from_string("192.168.1.2"), 1234 });
    //socket->close();
}

TestIOService::TestIOService(std::string address) 
    : address(address) { }

TestIOService TestIOService::getInst() {
    return TestIOService("192.168.1.2");
}

int main() {
    auto test1 = TestIOService::getInst();
    auto test2 = TestIOService::getInst();
}

使用boost :: asio :: io_service作为类成员字段

1 个答案: