错误：无效的声明符之前与typedef [英] error: invalid declarator before with typedef

问题描述

#ifndef CLASS_VEHICLE_
#define CLASS_VEHICLE_

#include "ns3/ptr.h"
#include "ns3/object.h"
#include "ns3/vector.h"
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/mobility-module.h"
#include "ns3/config-store-module.h"
#include "ns3/wifi-module.h"
#include "Cluster.h"


namespace ns3
{
class Cluster;

/// define type DeviceTraceCallback
typedef Callback<void, Ptr<Vehicle>, std::string, Ptr<const Packet> > DeviceTraceCallback;  // Line where the error is
/// define type VehicleReceiveCallback.
typedef Callback<void, Ptr<Vehicle>, Ptr<const Packet>, Address> VehicleReceiveCallback;
/// define type PhyRxOkTraceCallback.
typedef Callback<void, Ptr<Vehicle>, std::string, Ptr<const Packet>, double, WifiMode, enum WifiPreamble> PhyRxOkTraceCallback; 
/// define type PhyRxErrorTraceCallback.
typedef Callback<void, Ptr<Vehicle>, std::string, Ptr<const Packet>, double> PhyRxErrorTraceCallback; 
/// define type PhyTxTraceCallback.
typedef Callback<void, Ptr<Vehicle>, std::string, Ptr<const Packet>, WifiMode, WifiPreamble, uint8_t> PhyTxTraceCallback; 
/// define type PhyStateTraceCallback.
typedef Callback<void, Ptr<Vehicle>, std::string, Time, Time, enum WifiPhy::State> PhyStateTraceCallback;

class Vehicle : public ns3::Object
{
  ... code section

 };
};
#endif

您好我正在ns3上工作，这可以让我做一些关于车辆网络的模拟。我有几个类，但只有一个是烦人。事实上，当我编译我有这个特定的错误：/src/vanet/model/Vehicle.h:45：错误：无效声明器'''DeviceTraceCallback'，它带来了吨其他错误/ src / vanet / model / Vehicle .h：212：error：'DeviceTraceCallback'没有命名类型或
../src/vanet/model/Vehicle.h:214：error：'DeviceTraceCallback'没有被声明。
我真的不明白我做错了什么，所以如果有人可以帮助我，这将是非常好的。

Hi I am working on ns3, and I've to implement a code which could let me do some simulations about vehicular networks. I have several class, but only one is annoying. Indeed when I compile I have this particular error : "/src/vanet/model/Vehicle.h:45: error: invalid declarator before ‘DeviceTraceCallback’" and it brings a tons other errors as "/src/vanet/model/Vehicle.h:212: error: ‘DeviceTraceCallback’ does not name a type" or "../src/vanet/model/Vehicle.h:214: error: ‘DeviceTraceCallback’ has not been declared". I really don't understand what I did wrong, so if someone could help me it would be very nice !

Thx提前。

HL

推荐答案

您尚未向我们显示错误所指的来源，但我假设它是这个：

You haven't shown us which source line the error refers to, but I'll assume it's this one:

typedef Callback<void, Ptr<Vehicle>, std::string, Ptr<const Packet> > DeviceTraceCallback; 

在该行中提到的所有类型和模板都已在您包含的标题之一中声明？特别是：

Have all the types and templates mentioned in that line been declared in one of the headers you've included? In particular:

• 您没有直接包含< string> 。


• 您尚未声明车辆类型，稍后在此文件中定义。您需要在此声明中使用声明（ class Vehicle; 在 namespace ns {} 。



• You haven't directly included <string>. It's a good idea to do that, even if one of the other headers might include it indirectly.
• You haven't declared the Vehicle type, defined later in this file. You'll need a declaration (class Vehicle; inside namespace ns {}) before you can use it in this declaration.

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