调用自己的函数时，类中的枚举不会改变

Question

简短问题描述

我遇到的问题是，当我更改枚举但它没有改变时 它看起来只是一个本地变化。

如果我这样做，下面的报价很好。

level = new level_1();
while(true)
{
    cout << level->state << endl; // show '1' at first loop. Another loop show '2'
    level->state = STATE_INITIALIZE;
}

但我必须在他的功能中改变状态

level = new level_1();
while(true)
{
    cout << level->state << endl; // show '1' only
    level.do();
}

level.do功能

void Level_1::do()
{
    state = STATE_INITIALIZE; // If this work, it should be '2'
    // this->state = STATE_INITIALIZE;
}

所以对我来说这是一个很大的问题，它不会改变!! T_T

长码

这是一些代码（几乎是完整的代码）

Level.h

enum LEVEL_STATE
{       STATE_LOAD = 1,
        STATE_INITIALIZE = 2,
        STATE_UPDATE = 3,
        STATE_DRAW = 4,
        STATE_FREE = 5,
        STATE_UNLOAD = 6
};

class Level {
public:
    LEVEL_STATE state = STATE_LOAD;
    vector<Shader> shader;
    vector<Model> model;
    virtual void load()=0;
    virtual void initialize()=0;
    virtual void update()=0;
    virtual void draw(Shader)=0;
    virtual void free()=0;
    virtual void unload()=0;
    virtual Level* next()=0;
};

Map_Level_1.h

#include"Level.h"

class Level_1 : public Level {
public:
    LEVEL_STATE state;
    vector<Shader> shader;
    vector<Model> model;
    void load();
    void initialize();
    void update();
    void draw(Shader);
    void free();
    void unload();
    Level* next();
};

Map_Level_1.cpp

#pragma once
#include"Map_Level_0.h"
#include"Map_Level_1.h"

extern Camera camera;
extern float SCR_WIDTH;
extern float SCR_HEIGHT;

void Level_1::load()
{
    shader.push_back(Shader("../Shader/alpha.vertex", "../Shader/alpha.fragment")); // this worked!
    model.push_back(Model (FileSystem::getPath("res/arcade/arcade.obj"))); // this worked!
    state = STATE_INITIALIZE; // this is not worked! the value doesn't change!
}

void Level_1::initialize()
{
    shader[0].use();
    state = STATE_UPDATE; // this is not worked! the value doesn't change!
}

void Level_1::update()
{
    shader[0].use();
    state = STATE_DRAW; // this is not worked! the value doesn't change!
}

void Level_1::draw(Shader shader)
{
    glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 10000.0f);
    glm::mat4 view = camera.GetViewMatrix();
    glm::mat4 model;

    shader.setMat4("projection", projection);
    shader.setMat4("view", view);
    shader.setInt("mode", 0);

    //model = scale(vec3(5.0f, 5.0f, 5.0f));
    shader.setMat4("model", model);
    shader.setInt("fragMode", 1);
    shader.setVec3("fragColor", vec3(0.92f, 0.92f, 0.92f));
    this->model[0].Draw(shader);
    state = STATE_UPDATE; // this is not worked! the value doesn't change!
}

void Level_1::free()
{

}

void Level_1::unload()
{

}

Level* Level_1::next() {
    return new Level_0();
}

Main.cpp的

level = new Level_1();
while (!glfwWindowShouldClose(window))
{
    DEV_processInput(window);

    cout << level->state;
    switch (level->state)
    {
    case STATE_LOAD:
        level->load();
    case STATE_INITIALIZE:
        level->initialize();
    case STATE_UPDATE:
        level->update();
    case STATE_DRAW:
        level->draw(shader_1);
    case STATE_FREE:
        level->free();
    case STATE_UNLOAD:
        level->unload();
    }

    glfwSwapBuffers(window);
    glfwPollEvents();
}

如果我 1.）做错了很容易修复 2.）重复任何问题

我会道歉..

Answer 1

您在基类中定义了一个state成员，然后在子类中重新定义了相同的成员，这导致了这个问题。

如果你有一个Level * level指针，无论它指向哪个子类实例，你总是会读到基类 state成员，而你写的是他们方法中的子类成员（即do）。

我建议仅在基类中定义state（并使其成为protected。）