Question

对于一个项目，我们的教授为我们提供了一个.cpp文件和三个包含Class定义的.h文件。该项目的目标是为这些类构造实现.cpp文件。

我知道using namespace std;是一种不好的做法，应该不惜一切代价避免，但是老师在完成项目时坚持了三个要点：

您不得修改任何提供的文件。 “不是一个字符”。（减少了60％的标记）
它无法在Visual Studio 2017中构建。（标记减少了60％）
在正常运行期间崩溃。（减少了60％的分数）

我的问题是，我收到一些与他在一个类中对forward_list<>的定义有关的错误。这些错误对我来说毫无意义...在过去的几个小时里，我一直在挠头，同时尝试纠正这些错误：

1>Animation.cpp
1>AnimationManager.cpp
1>c:\users\ali-g\desktop\cst8219\assignment2\assignment2\animation.h(7): error C2143: syntax error: missing ';' before '<'
1>c:\users\ali-g\desktop\cst8219\assignment2\assignment2\animation.h(7): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\ali-g\desktop\cst8219\assignment2\assignment2\animation.h(7): error C2238: unexpected token(s) preceding ';'
1>Ass2.cpp
1>Generating Code...
1>Done building project "Assignment2.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

这是他提供的.h文件，其中包含Animation类定义：

//Animation.h
#pragma once

class Animation
{
    string animationName;
    forward_list<Frame> frames;
public:
    Animation(string name) :animationName(name) {}
    ~Animation() {}
    void EditFrame();
    void DeleteFrame();
    friend istream& operator>>(istream&, Animation&);// Add a Frame as in cin >> A;
    friend ostream& operator<<(ostream&, Animation&);// output the Frames as in cout << A;
};

这是我从Animation Class实现的.cpp文件：

//Animation.cpp
#include <iostream>
#include <string>
#include <forward_list>
using namespace std;
#include "Frame.h"
#include "Animation.h"

void Animation::EditFrame() {

}

void Animation::DeleteFrame() {

}

istream& operator>> (istream& in, Animation& animation) {


    return in;
}

ostream& operator<< (ostream& out, Animation& animation) {


    return out;
}

他提供的.h文件包含AnimationManager类的定义：

// AnimationManager.h
#pragma once

class AnimationManager
{
    string managerName;
    vector<Animation> animations;
public:
    AnimationManager(string name) :managerName(name) {}
    ~AnimationManager() {}
    void EditAnimation();
    void DeleteAnimation();
    friend istream& operator>>(istream&, AnimationManager&);// add an Animation
    friend ostream& operator<<(ostream&, AnimationManager&);// output the Animations
};

这是我的AnimationManager类的实现文件：

#include <iostream>
#include <string>
#include <vector>
using namespace std;
#include "Frame.h"
#include "Animation.h"
#include "AnimationManager.h"

void AnimationManager::EditAnimation() {

}

void AnimationManager::DeleteAnimation() {

}

istream & operator>>(istream &in, AnimationManager &manager){

    string name;

    cout << "Please enter Animation Name: ";
    cin >> name;

    //resize vector array to accommodate a new Animation
    manager.animations.resize(manager.animations.size() + 1);
    manager.animations.push_back(Animation(name));

}

ostream & operator<<(ostream &out, AnimationManager &manager){

}

我还将为其他随附的头文件（Frame.h）包含.h＆.cpp文件，因为它可以帮助您发现我的（最可能是愚蠢的）错误。

“ Frame.h”：

// Frame.h
#pragma once
class Frame{ 
    char* frameName; 
    double duration; 
public:
    Frame(char*, double); 
    Frame(const Frame&); 
    ~Frame(); 
    Frame& operator=(const Frame&); 
    friend ostream& operator<<(ostream&, Frame&); 
};

“ Frame.cpp”：

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;
#include "Frame.h"

Frame::Frame(char* name, double dur) {

    //Set frame name
    frameName = new char[strlen(name) + 1];
    strcpy(this->frameName, name);

    //set duration
    duration = dur;

}

Frame::Frame(const Frame& frame) {

    //copy name from passed frame
    frameName = new char[strlen(frame.frameName) + 1];
    strcpy(frameName, frame.frameName);

    //copy duration
    duration = frame.duration;

}

Frame::~Frame() {

    //free the space allocated for frameName
    if (frameName != nullptr) {
        delete[] frameName;
    }

}

Frame& Frame::operator= (const Frame& frame) {

    //create new Frame using given frame information
    Frame copyFrame = Frame(frame.frameName, frame.duration);

    //return reference to new frame.
    return copyFrame;

}

ostream& operator<< (ostream& out, Frame& frame) {

    //add frameName and duration to ostream.
    out << "\tframeName - " << frame.frameName << "; ";
    out << "duration - " << frame.duration << endl;

    //return ostream
    return out;

}

对于解决此问题的任何帮助，我将不胜感激。预先感谢！

forward_list-缺少“;”在“ <”

0 个答案: