错误错误：没有名为“type”的类型调用 ioService()->post(std::bind(some argmumet) 时

Question

class LogSyslogTest{
 using LogSyslogCbFn = std::function<status(Ipc::Instream& stream)>;
static void v4Handler(const LogSyslogHdr& logSyslogHdr, const Ipc::Ipv4& ipv4,
                        const Layer4Bytes& l4Bytes, CbFn fn) {
        Ipc::Outstream out;
        out << logSyslogHdr;
        out << ipv4;
        out << l4Bytes.sPort;
        out << l4Bytes.dPort;
        Ipc::Instream in{out.data(), out.size()};
        fn(in);
}
}
//calling using gtest
Test F(LogSyslogTest, Ipv4Test) {
    LogSyslogHdr logSyslogHdr;
    getLogSyslogHdrIpv4(logSyslogHdr); //fills data

    Ipc::Ipv4 ipv4;
    getIpv4Hdr(ipv4);  //fills data

    Layer4Bytes l4Bytes;
    getL4Bytes1(l4Bytes);  //fills data

    for (int itr = 0; itr < 10000; ++itr) {
        ioService()->post(std::bind(LogSyslogTest::v4Handler, logSyslogHdr,
                                    ipv4, l4Bytes,Handler::processLog));
}

这是抽象代码片段。编译此文件时，我收到以下错误。 错误1-->

/volume/evo/files/opt/poky/3.0.2-10/sysroots/x86_64-pokysdk-linux/usr/include/boost/asio/impl/io_context.hpp:190:5: error: static assertion failed: CompletionHandler type requirements not met^M
  190 |     BOOST_ASIO_LEGACY_COMPLETION_HANDLER_CHECK(^M
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^M

错误2-->

/volume/evo/files/opt/poky/3.0.2-10/sysroots/x86_64-pokysdk-linux/usr/include/c++/9.2.0/functional:443:8: error: no type named 'type' in 'class std::result_of<void (*&(LogSyslogHdr&, Ipc::Ipv4&, Layer4Bytes&, AftStatus (&)(Ipc::Istream<Ipc::ImMutable>&, const PacketService::AmPktIoHdr&)))(const LogSyslogHdr&, const Ipc::Ipv4&, const Layer4Bytes&, std::function<Status(Ipc::Istream<Ipc::ImMutable>&)>)>'^M
  443 |  using _Res_type_impl^M
      |        ^~~~~~~~~~~~~~^M

错误2重复了4次。我尝试使用 std::ref 传递参数，但我仍然面临同样的问题。 有人可以帮助我理解这里出了什么问题吗？

Answer 1

对于错误 1，请查看 Boost 1.74, io_context.hpp ，发现如下行：

// If you get an error on the following line it means that your handler does
// not meet the documented type requirements for a LegacyCompletionHandler.
BOOST_ASIO_LEGACY_COMPLETION_HANDLER_CHECK(
    LegacyCompletionHandler, handler) type_check;

Error 2指的是类型std::function&)> 但你有 std::function ;。我不知道流类型是否兼容，但 status 不是 Status。