如何在数组中初始化此 class？

Question

我正在尝试创建一个 class filePlayerGui 数组，当我尝试在构造函数中初始化它时，它不允许我这样做

class MainComponent   : public Component,
                    public MenuBarModel
{
public:
//==============================================================================
/** Constructor */
MainComponent (Audio& audio_);

/** Destructor */
~MainComponent();

void resized() override;

//MenuBarEnums/Callbacks========================================================
enum Menus
{
    FileMenu=0,

    NumMenus
};

enum FileMenuItems
{
    AudioPrefs = 1,

    NumFileItems
};
StringArray getMenuBarNames() override;
PopupMenu getMenuForIndex (int topLevelMenuIndex, const String& menuName) override;
void menuItemSelected (int menuItemID, int topLevelMenuIndex) override;

private:
Audio& audio;
FilePlayerGui filePlayerGui[2] {audio.getFilePlayer(0), audio.getFilePlayer(1)};



//==============================================================================
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainComponent)
};

filePlayerGui 出现此错误 "Copying array element of type 'FilePlayerGui' invokes deleted constructor"。我已经尝试在下面的 .cpp 文件中初始化它，但它告诉我我需要一个数组初始化器

MainComponent::MainComponent (Audio& audio_) : audio (audio_)
{


setSize (500, 400);
addAndMakeVisible(filePlayerGui[0]);
addAndMakeVisible(filePlayerGui[1]);
}

MainComponent::~MainComponent()
{

}

 void MainComponent::resized()
 {
filePlayerGui[0].setBounds (0, 0, getWidth(), 40);
 }

   //MenuBarCallbacks==============================================================
 StringArray MainComponent::getMenuBarNames()
{
const char* const names[] = { "File", 0 };
return StringArray (names);
}

PopupMenu MainComponent::getMenuForIndex (int topLevelMenuIndex, const String& menuName)
{
PopupMenu menu;
if (topLevelMenuIndex == 0)
    menu.addItem(AudioPrefs, "Audio Prefrences", true, false);
return menu;
}

void MainComponent::menuItemSelected (int menuItemID, int topLevelMenuIndex)
{
if (topLevelMenuIndex == FileMenu)
{
    if (menuItemID == AudioPrefs)
    {
        AudioDeviceSelectorComponent audioSettingsComp (audio.getAudioDeviceManager(),
                                                        0, 2, 2, 2, true, true, true, false);
        audioSettingsComp.setSize (450, 350);
        DialogWindow::showModalDialog ("Audio Settings",
                                       &audioSettingsComp, this, Colours::lightgrey, true);
    }
}
}

Answer 1

Copying array element of type FilePlayerGui invokes deleted constructor

意味着这一行的一些变体在 FilePlayerGui:

的声明中

FilePlayerGui(const FilePlayerGui&) = delete

表示无法复制FilePlayerGui：https://en.cppreference.com/w/cpp/language/copy_constructor#Deleted_implicitly-declared_copy_constructor

有变通办法，但您绕过了 FilePlayerGui 作者对 class 的意图。所以正确答案应该到此为止。 FilePlayerGui 的任何使用都应通过 classes audio 成员完成，使用：audio.getFilePlayer(0) 或 audio.getFilePlayer(1)。（如果这是 MainComponent 的唯一成员，很可能 MainComponent 应该被淘汰。）

如果你想知道如何做坏事，我会在任何代码审查中拒绝，你可以将 filePointerGui 创建为：

FilePointerGui* filePointerGui[2] 将初始化为：

MainComponent::MainComponent(Audio& audio_) : audio(audio_), filePointerGui({ &audio.getFilePlayer(0), &audio.getFilePlayer(1) })

访问将执行为：

*filePointerGui[0]

Live Example

reference_wrapper<FilePointerGui> filePointerGui[2] 将被初始化为：

MainComponent::MainComponent(Audio& audio_) : audio(audio_), filePointerGui({ audio.getFilePlayer(0), audio.getFilePlayer(1) })

访问将执行为：

filePointerGui[0].get()

Live Example

可能值得再次强调这是糟糕的代码，因为它试图超越语言并绕过 classes 设计的意图。但这是 c++ 所以你可以做到。

如何在数组中初始化此 class？

How can I initialise this class in an array?

c++

arrays

class

juce