使用boost.asio编译boost库时遇到问题。
我正在尝试从类构造函数创建一个boost-udp套接字。我尝试了几个不同的东西来编译，但我仍然看到了这个问题。
有没有人对这个问题有所了解？任何人都可以帮我解决这个错误，我在做什么？
这是我的班级：
class NetworkTestToolServer
{
private:
boost::asio::io_service* my_io_service;
boost::asio::ip::udp::endpoint server_endpoint;
boost::asio::ip::udp::socket server_udp_socket;
boost::asio::ip::udp::endpoint sender_endpoint;
boost::asio::ip::udp::endpoint client_endpoint;
public:
NetworkTestToolServer(short port);
};
这是我的构造函数，我正在使用（在server_udp_socket失败）：
NetworkTestToolServer::NetworkTestToolServer(short port)
{
my_io_service = new boost::asio::io_service();
server_endpoint = boost::asio::ip::udp::endpoint(boost::asio::ip::udp::v4(),
50002);
server_udp_socket = boost::asio::ip::udp::socket(*my_io_service,
server_endpoint);
}
我看到以下错误：
user2@user2-VirtualBox:~/network_test_tool/network-test-tool/build$ make
[ 20%] Built target gmock_main
[ 35%] Built target gmock
[ 45%] Built target gtest
[ 55%] Built target gtest_main
Scanning dependencies of target network-test-tool-lib
[ 60%] Building CXX object app/CMakeFiles/network-test-tool-lib.dir/src/ntt/NetworkTestToolServer.cpp.o
/home/user2/network_test_tool/network-test-tool/app/src/ntt/NetworkTestToolServer.cpp: In constructor ‘ntt::NetworkTestToolServer::NetworkTestToolServer(short int)’:
/home/user2/network_test_tool/network-test-tool/app/src/ntt/NetworkTestToolServer.cpp:34:56: error: no matching function for call to ‘boost::asio::basic_datagram_socket<boost::asio::ip::udp>::basic_datagram_socket()’
NetworkTestToolServer::NetworkTestToolServer(short port)
^
In file included from /usr/include/boost/asio.hpp:21:0,
from /home/user2/network_test_tool/network-test-tool/app/src/ntt/NetworkTestToolServer.cpp:3:
/usr/include/boost/asio/basic_datagram_socket.hpp:183:3: note: candidate: template<class Protocol1, class DatagramSocketService1> boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::basic_datagram_socket(boost::asio::basic_datagram_socket<Protocol1, DatagramSocketService1>&&, typename std::enable_if<std::is_convertible<Protocol1, Protocol>::value>::type*)
basic_datagram_socket(
^~~~~~~~~~~~~~~~~~~~~
/usr/include/boost/asio/basic_datagram_socket.hpp:183:3: note: template argument deduction/substitution failed:
/home/user2/network_test_tool/network-test-tool/app/src/ntt/NetworkTestToolServer.cpp:34:56: note: candidate expects 2 arguments, 0 provided
NetworkTestToolServer::NetworkTestToolServer(short port)
^
In file included from /usr/include/boost/asio.hpp:21:0,
from /home/user2/network_test_tool/network-test-tool/app/src/ntt/NetworkTestToolServer.cpp:3:
/usr/include/boost/asio/basic_datagram_socket.hpp:147:3: note: candidate: boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::basic_datagram_socket(boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>&&) [with Protocol = boost::asio::ip::udp; DatagramSocketService = boost::asio::datagram_socket_service<boost::asio::ip::udp>]
basic_datagram_socket(basic_datagram_socket&& other)
^~~~~~~~~~~~~~~~~~~~~
/usr/include/boost/asio/basic_datagram_socket.hpp:147:3: note: candidate expects 1 argument, 0 provided
/usr/include/boost/asio/basic_datagram_socket.hpp:129:3: note: candidate: boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::basic_datagram_socket(boost::asio::io_service&, const protocol_type&, const native_handle_type&) [with Protocol = boost::asio::ip::udp; DatagramSocketService = boost::asio::datagram_socket_service<boost::asio::ip::udp>; boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::protocol_type = boost::asio::ip::udp; boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::native_handle_type = int]
basic_datagram_socket(boost::asio::io_service& io_service,
^~~~~~~~~~~~~~~~~~~~~
/usr/include/boost/asio/basic_datagram_socket.hpp:129:3: note: candidate expects 3 arguments, 0 provided
/usr/include/boost/asio/basic_datagram_socket.hpp:108:3: note: candidate: boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::basic_datagram_socket(boost::asio::io_service&, const endpoint_type&) [with Protocol = boost::asio::ip::udp; DatagramSocketService = boost::asio::datagram_socket_service<boost::asio::ip::udp>; boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::endpoint_type = boost::asio::ip::basic_endpoint<boost::asio::ip::udp>]
basic_datagram_socket(boost::asio::io_service& io_service,
^~~~~~~~~~~~~~~~~~~~~
/usr/include/boost/asio/basic_datagram_socket.hpp:108:3: note: candidate expects 2 arguments, 0 provided
/usr/include/boost/asio/basic_datagram_socket.hpp:86:3: note: candidate: boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::basic_datagram_socket(boost::asio::io_service&, const protocol_type&) [with Protocol = boost::asio::ip::udp; DatagramSocketService = boost::asio::datagram_socket_service<boost::asio::ip::udp>; boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::protocol_type = boost::asio::ip::udp]
basic_datagram_socket(boost::asio::io_service& io_service,
^~~~~~~~~~~~~~~~~~~~~
/usr/include/boost/asio/basic_datagram_socket.hpp:86:3: note: candidate expects 2 arguments, 0 provided
/usr/include/boost/asio/basic_datagram_socket.hpp:69:12: note: candidate: boost::asio::basic_datagram_socket<Protocol, DatagramSocketService>::basic_datagram_socket(boost::asio::io_service&) [with Protocol = boost::asio::ip::udp; DatagramSocketService = boost::asio::datagram_socket_service<boost::asio::ip::udp>]
explicit basic_datagram_socket(boost::asio::io_service& io_service)
^~~~~~~~~~~~~~~~~~~~~
/usr/include/boost/asio/basic_datagram_socket.hpp:69:12: note: candidate expects 1 argument, 0 provided
app/CMakeFiles/network-test-tool-lib.dir/build.make:110: recipe for target 'app/CMakeFiles/network-test-tool-lib.dir/src/ntt/NetworkTestToolServer.cpp.o' failed
make[2]: *** [app/CMakeFiles/network-test-tool-lib.dir/src/ntt/NetworkTestToolServer.cpp.o] Error 1
CMakeFiles/Makefile2:1228: recipe for target 'app/CMakeFiles/network-test-tool-lib.dir/all' failed
make[1]: *** [app/CMakeFiles/network-test-tool-lib.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2
user2@user2-VirtualBox:~/network_test_tool/network-test-tool/build$
答案 0 :(得分：0)
udp::socket没有默认构造函数。你的构造函数是，
NetworkTestToolServer::NetworkTestToolServer(short port)
{
my_io_service = new boost::asio::io_service();
server_endpoint = boost::asio::ip::udp::endpoint(boost::asio::ip::udp::v4(),
50002);
server_udp_socket = boost::asio::ip::udp::socket(*my_io_service,
server_endpoint);
}
这是编写构造函数的一种非常糟糕的方式。构造函数将为类中的每个成员调用默认构造函数。在您的情况下，udp::socket没有默认构造函数。这就是它无法编译的原因。只有在默认构造之后，才会执行大括号块中的语句。你需要的是member initializer list。有关更多参考，请参阅此stackoverflow question。
你想要的是这样的，
class NetworkTestToolServer
{
using udp = boost::asio::ip::udp;
private:
boost::asio::io_service* my_io_service;
udp::endpoint server_endpoint;
udp::socket server_udp_socket;
udp::endpoint sender_endpoint;
udp::endpoint client_endpoint;
public:
NetworkTestToolServer(short port);
};
NetworkTestToolServer::NetworkTestToolServer(short port)
: my_io_service(new boost::asio::io_service),
server_endpoint(udp::endpoint(udp::v4(), port)),
server_udp_socket(udp::socket(*my_io_service, server_endpoint))
{
}
不幸的是，gcc没有产生非常好的错误代码。 clang给出了更好的错误，
udp_bad.cpp:15:24: error: constructor for 'NetworkTestToolServer' must explicitly initialize the member 'server_udp_socket' which does not have a default constructor
NetworkTestToolServer::NetworkTestToolServer(short port)
下次尝试多个编译器。