boost :: asio :: async_read绑定编译错误 [英] boost::asio::async_read bind compilation error
问题描述
我找不到为什么会收到这个错误:
I can't figure out why I get this error :
/usr/local/include/boost/asio/impl/read.hpp: In member function ‘void boost::asio::detail::read_op<AsyncReadStream, boost::asio::mutable_buffers_1, CompletionCondition, ReadHandler>::operator()(const boost::system::error_code&, size_t, int) [with AsyncReadStream = boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >, CompletionCondition = boost::asio::detail::transfer_at_least_t, ReadHandler = boost::function<void ()(long unsigned int)>]’:
/usr/local/include/boost/asio/impl/read.hpp:263: instantiated from ‘void boost::asio::async_read(AsyncReadStream&, const MutableBufferSequence&, CompletionCondition, ReadHandler) [with AsyncReadStream = boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >, MutableBufferSequence = boost::asio::mutable_buffers_1, CompletionCondition = boost::asio::detail::transfer_at_least_t, ReadHandler = boost::function<void ()(long unsigned int)>]’
src/communicator/protocol/Command.cc:34: instantiated from here
/usr/local/include/boost/asio/impl/read.hpp:215: error: no match for call to ‘(boost::function<void ()(long unsigned int)>) (const boost::system::error_code&, const long unsigned int&)’
/usr/local/include/boost/function/function_template.hpp:1007: note: candidates are: typename boost::function1<R, T1>::result_type boost::function1<R, T1>::operator()(T0) const [with R = void, T0 = long unsigned int]
make: *** [src/communicator/protocol/Command.o] Error 1
这里我的类:
Command.hh
Here my class : Command.hh
namespace communicator {
namespace protocol {
namespace in {
class Command : public boost::enable_shared_from_this<Command> {
public:
~Command();
typedef boost::shared_ptr<Command> pointer;
void got_newline();
protected:
Command(tcp::socket& socket, structure::Client& client) :
m_socket(socket), m_client(client) {};
void endParsing();
tcp::socket& m_socket;
structure::Client& m_client;
char m_newline[2];
private:
};
}
}
Command.cc:
Command.cc :
namespace communicator {
namespace protocol {
namespace in {
void Command::endParsing() {
boost::function<void()> cb = boost::bind(&Command::got_newline,
shared_from_this());
boost::asio::async_read(m_socket,
boost::asio::buffer(m_newline, 2),
boost::asio::transfer_at_least(2),
**ERROR POINTING THIS LINE** cb);
}
void Command::got_newline() {
if (m_newline[0] == '\r' && m_newline[1] == '\n') {
std::cout << "End" << std::endl;
}
}
}
}
}
检查代码块上的** Error pointing this line **,这是它有一个问题...不知道为什么,一次又一次地破坏了我的头...
Check for the "** Error pointing this line**" on the Code block, this is where it has an issue... not sure why, broke my head again and again...
感谢帮助
为了清晰起见,我删除了一些代码,如果您有任何问题,请不要犹豫
推荐答案
您的完成处理程序签名不正确, b
$ b
Your completion handler signature is not correct, consider this example
#include <boost/asio.hpp>
#include <boost/function.hpp>
#include <boost/bind.hpp>
void
foo()
{
}
int
main()
{
boost::asio::io_service io_service;
boost::asio::ip::tcp::socket socket( io_service );
char buf[2];
// this compiles file
boost::asio::async_read(
socket,
boost::asio::buffer(buf),
boost::asio::transfer_at_least(2),
boost::bind( &foo )
);
// this does not
boost::function<void()> cb = boost::bind( &foo );
boost::asio::async_read(
socket,
boost::asio::buffer(buf),
boost::asio::transfer_at_least(2),
cb
);
}
boost :: bind
足够聪明,不能将
错误
或 bytes_transferred
参数传递给绑定函数指针。 Asio图书馆的作者有关于使用详细博文与库绑定。这是值得读的。
boost::bind
is smart enough to not pass the error
or bytes_transferred
parameters to your bound function pointer. The author of the Asio library has a detailed blog post about using bind with the library. It is worth the read.
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