JUCE:无法实例化类"operate '=‘to Not match the operand“

Question

我正在努力使用JUCE库，因为我正在遵循GUI教程，并且出于某种原因，我不能在初始化函数中使用"new instance“语法。对于这个特定的代码块，是否有什么上下文特定的东西不允许使用"new“操作符来实例化GUI窗口类？

 #include "../JuceLibraryCode/JuceHeader.h"
    #include "MainComponent.h"
    #include <iostream>

    /* Auto generated code*/

    class MyApplication: public JUCEApplication
    {
    public:
        //==============================================================================
        MyApplication() {}

        const String getApplicationName() override       { return ProjectInfo::projectName; }
        const String getApplicationVersion() override    { return ProjectInfo::versionString; }
        bool moreThanOneInstanceAllowed() override       { return true; }

        //==============================================================================
        void initialise (const String& commandLine) override
        {


            MyWindow.reset (new The_Main_Window (getApplicationName()));

            MyWindow = new The_Main_Window(getApplicationName()); //New instance syntax. 
        }

        void shutdown() override
        {
            // Add your application's shutdown code here..

            MyWindow = nullptr; // (deletes our window)
        }

        //==============================================================================
        void systemRequestedQuit() override
        {
            // This is called when the app is being asked to quit: you can ignore this
            // request and let the app carry on running, or call quit() to allow the app to close.
            quit();
        }

        void anotherInstanceStarted (const String& commandLine) override
        {
            // When another instance of the app is launched while this one is running,
            // this method is invoked, and the commandLine parameter tells you what
            // the other instance's command-line arguments were.
        }

        //==============================================================================
        /*
            This class implements the desktop window that contains an instance of
            our MainComponent class.
        */
        class The_Main_Window    : public DialogWindow
        {
        public:
            The_Main_Window (String name) : DialogWindow (name, Colours::beige,DialogWindow::allButtons)

            {
                setUsingNativeTitleBar (true);
                setContentOwned (new MainComponent(), true);
                setResizable (true, true);

                centreWithSize (300, 600);
                setVisible (true);
            }

            void closeButtonPressed() override
            {

                JUCEApplication::getInstance()->systemRequestedQuit();
            }



        private:
            JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (The_Main_Window)
        };

    private:
        std::unique_ptr<The_Main_Window> MyWindow; // what the heck does this guy do? 
    };

    //==============================================================================
    // This macro generates the main() routine that launches the app.
    START_JUCE_APPLICATION (MyApplication) // This guy generates the entry point?

Answer 1

唯一指针没有新指针的赋值运算符(https://en.cppreference.com/w/cpp/memory/unique_ptr/operator=)。为此，您需要reset。

不管怎样，你做了两次同样的事情，第二次是多余的(有赋值的那次)。

void initialise (const String& commandLine) override
{
    MyWindow.reset (new The_Main_Window (getApplicationName()));
}

关机也是如此：

void shutdown() override
{
    // Add your application's shutdown code here..

    MyWindow.reset(); // (deletes our window)
}