无法识别的类型 - “错误：变量”[var-name]不是类型名称' [英] Unrecognised type - 'Error: Variable "[var-name]" is not a type name'

问题描述

我正在创建一个类来处理物理作为项目的一部分。我们被告知要使用一个处理任意行为的类。

I'm creating a class for handling physics as part of a project. We were told to use a class which handles arbitrary behaviours.

我创建了一个类，它将根据给定的模块更新内部状态（代码如下）。然而，表示内部状态 PhysicsData 的结构在除了它自己的文件之外不被识别。任何人都可以散发一些光？

I've created a class which will update an internal state based on modules that are given to it (code follows). However, the structure representing the internal state, PhysicsData, isn't being recognised anywhere except its own file. Can anyone shed some light?

（对不起，大量的信息，但对象之间的差距是一个问题和地方是一个问题是相当大，修剪额外的细节也删除了有用的上下文）

(Sorry for the massive dump of information, but the gap between the object being a problem and the place where it's a problem is quite large and trimming down the extra details also removes context that can be useful)

这里是有问题的结构：

#pragma once

// This file "PhysicsBehaviourBase.h"

#include <d3dx9.h>
#include <vector>

struct PhysicsData
{
public:
    D3DXVECTOR3 velocity;
    D3DXVECTOR3 position;
    D3DXVECTOR3 rotation;
    float size;

    PhysicsData();
    void add(const PhysicsData& pd);
};

所有对 PhysicsData 这个文件很好。但是这个文件开始提示问题：

All references to PhysicsData in the rest of this file are fine. However this file starts to hint at problems:

#pragma once
// This file: "PhysicsBehaviours.h"

#include "PhysicsBehavioursBase.h"

class GravityConstant : public PhysicsBehaviour
{
private:
    float g; // Gravitational constant

    // Required by the PhysicsBehaviour interface.
    PhysicsBehaviour* copy() const {return new GravityConstant(g);}
public:
    GravityConstant(float accelleration_due_to_gravity = 9.81)
        : g(accelleration_due_to_gravity) {}

    // Required by the PhysicsBehaviour interface.
    void update(float time,const PhysicsData&, PhysicsData* out)
        {out->velocity.y -= g*time;}
};

在 void update（float time，const PhysicsData& PhysicsData * out ）行对 PhysicsData 的引用都给出了IntelliSense错误消息：

In the void update(float time,const PhysicsData&, PhysicsData* out) line both references to PhysicsData are given the IntelliSense error message:

Physics PhysicsData 

Error: variable "PhysicsData" is not a type name.

我不知道为什么IntelliSense认为 PhysicsData 是 Physics 类型的变量。 （ Physics 是我声明的类型， PhysicsData 是用于构造物理对象的参数之一）。

I have no idea why IntelliSense think PhysicsData is a variable of type Physics. (Physics is a type I declare next, and PhysicsData is one of the parameters used to construct a physics object).

但是，此时没有编译器错误。编译器错误发生在层次结构中的下一个文件中：

There is no compiler error at this point, however. The compiler error happens in the next file up the hierarchy:

#pragma once

// "Physics.h"

#include "Timing.h"
#include "PhysicsBehaviours.h"
#include <d3dx9.h> // For D3DXVECTOR3
#include <vector>

class Physics
{
private:
    std::vector<PhysicsBehaviour*> behaviours_;
    Timing timer;
    PhysicsData data;
    void addBehaviours(const BEHAVIOUR_LIST&);
public:
    Physics(const PhysicsData&,const BEHAVIOUR_LIST&);
    ~Physics() {}
    void update();
    PhysicsData state() const {return data;}
    float age() const {return timer.age();}
};

这两个对PhysicsData的引用获得与上述相同的IntelliSense错误。编译器错误指向此函数：

Both references to PhysicsData get the same IntelliSense error as above. Compiler errors point to this function:

#include "Physics.h"
// "Physics.cpp"

Physics(const PhysicsData& initalState,const BEHAVIOUR_LIST& behaviour) // Line 4
    : data(initialState) // Line 5
{ // Line 6
    addBehaviours(behaviour);
}

编译器错误：

1>  Physics.cpp
1>[PATH]\physics.cpp(4): error C2226: syntax error : unexpected type 'PhysicsData'
1>[PATH]\physics.cpp(5): error C2065: 'initialState' : undeclared identifier
1>[PATH]\physics.cpp(6): error C2448: 'data' : function-style initializer appears to be a function definition

更多IntelliSense错误：
在& const PhysicsData& 来自第4行：

And more IntelliSense errors: Underneath the & in const PhysicsData& from line 4:

Error: this declaration has no storage class or type specifier.

第4行的小括号下：

Error: expected a declaration.

欢迎任何线索，修正或假设。

Any clues, fixes or hypotheses are welcome.

推荐答案

您缺少来自 Physics.cpp ：

Physics::Physics(const PhysicsData& initalState,const BEHAVIOUR_LIST& behaviour)
^^^^^^^^^

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