c++: error: cannot convert ‘ns3::TracedValue<ns3::SequenceNumber<unsigned int, int> >’ to ‘uint32_t {aka unsigned int}

Question

我正在尝试将 TracedValue<uint32_t> m_bytesInFlight 转换为 uint32_t 但出现以下错误

 error: cannot convert ‘ns3::TracedValue<ns3::SequenceNumber<unsigned int, int> >’ to ‘uint32_t {aka unsigned int}

函数原型和变量声明是

uint32_t UnAckDCount (void) const;

TracedValue<uint32_t>  m_bytesInFlight {0};        //!< Bytes in flight

这里我调用函数

uint32_t 
TcpSocketBase::UnAckDCount () const
{
  return m_tcb->m_highTxMark - (uint32_t) m_tcb->m_bytesInFlight;
}

请建议一些方法，以便我可以执行 return 语句以获得结果。提前致谢

Answer 1

将 m_tcb->m_highTxMark 更改为 m_tcb->m_highTxMark.Get().GetValue() 应该有效。

看到编译错误，很容易看出变量m_highTxMark的类型是ns3::TracedValue<ns3::SequenceNumber<unsigned int, int> >。我查看了 ns3::TracedValue 和 ns3::SequenceNumber 的文档，它们分别具有 getter 函数 Get() 和 GetValue()。

参见：

https://www.nsnam.org/doxygen/classns3_1_1_traced_value.html https://www.nsnam.org/doxygen/classns3_1_1_sequence_number.html

c++: error: cannot convert ‘ns3::TracedValue<ns3::SequenceNumber<unsigned int, int> >’ to ‘uint32_t {aka unsigned int}

c++: error: cannot convert ‘ns3::TracedValue<ns3::SequenceNumber<unsigned int, int> >’ to ‘uint32_t {aka unsigned int}

c++

casting

ns-3