SFML with Pointers. Image with vector and shared_ptr not showing

问题

The problem with the image output. If you directly use class 'picture', then everything is fine. If you use the class 'menu', then the image is not displayed.

Source.cpp — working code using the class 'picture' directly

#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
#include <windows.h>
#include <conio.h>
#include "Menu.h"


int main()
{
    sf::RenderWindow window(sf::VideoMode(960, 540), "Programmer Simulator", sf::Style::Close | sf::Style::Titlebar  /*sf::Style::Fullscreen*/);

    sf::Image icon;
    if (!icon.loadFromFile("image/icon.png")) throw;
    window.setIcon(32, 32, icon.getPixelsPtr());

    try
    {
        /*menu mainMenu(window);          // problem
        mainMenu.posСorrection();*/       // problem

        while (window.isOpen())
        {
            sf::Event event;
            while (window.pollEvent(event))
                if (event.type == sf::Event::Closed) window.close();

            /*mainMenu.draw();*/          // problem

            picture picture_background(window, "image/background/0.png");
            picture_background.putFullscreen();
            picture picture_menu_newgame(window, "image/menu/newgame.png");
            picture picture_menu_continue(window, "image/menu/continue.png");
            picture picture_menu_exit(window, "image/menu/exit.png");

            picture_menu_continue.putCenterOver();
            picture_menu_newgame.putOverObj(picture_menu_continue, 30);
            picture_menu_exit.putUnderObj(picture_menu_continue, 30);

            picture_background.draw();
            picture_menu_newgame.draw();
            picture_menu_continue.draw();
            picture_menu_exit.draw();
            window.display();
        }

    }
    catch (const char* msg)
    {
        MessageBoxA(0, msg, "GAME ERROR", MB_OK | MB_ICONASTERISK);
    }
    return 0;
}

Menu.h

#pragma once
#include <memory>
#include <iterator>
#include "Picture.h"

class menu
{
    const int menuPictCount;
    std::vector<std::shared_ptr<picture>> menuPicture;
public:
    menu(sf::RenderWindow& usableArea);
    void draw();
    void posСorrection();
    void shineButton(sf::Color color);
};

Menu.cpp — problem code

#include "Menu.h"

menu::menu(sf::RenderWindow& usableArea) : menuPictCount(4)
{
    this->menuPicture.resize(this->menuPictCount);

    //background
    menuPicture[0] = std::shared_ptr<picture>(new picture(usableArea, "image/background/0.png"));

    //buttons
    menuPicture[1] = std::shared_ptr<picture>(new picture(usableArea, "image/menu/newgame.png"));
    menuPicture[2] = std::shared_ptr<picture>(new picture(usableArea, "image/menu/continue.png"));
    menuPicture[3] = std::shared_ptr<picture>(new picture(usableArea, "image/menu/exit.png"));
}
void menu::draw()
{
    for (size_t i = 0; i < this->menuPictCount; i++) this->menuPicture[i]->draw();
}
void menu::posСorrection()
{
    const int buttonsCount = this->menuPictCount - 1;

    if (buttonsCount % 2 == 0)
    {
        int indexCenterOver = buttonsCount / 2;
        int indexCenterUnder = indexCenterOver + 1;
        this->menuPicture[indexCenterOver]->putCenterOver();
        this->menuPicture[indexCenterUnder]->putCenterUnder();

        for (size_t i = indexCenterOver - 1; i > 0; i--)
        {
            this->menuPicture[i]->putOverObj(*this->menuPicture[i + 1]);
        }
        for (size_t i = indexCenterUnder + 1; i <= buttonsCount; i++)
        {
            this->menuPicture[i]->putUnderObj(*this->menuPicture[i - 1]);
        }
    }
    else
    {
        const int indexCenter = buttonsCount / 2 + 1;

        this->menuPicture[indexCenter]->putCenter();

        for (size_t i = indexCenter - 1; i > 0; i--)
        {
            this->menuPicture[i]->putOverObj(*this->menuPicture[i + 1]);
        }
        for (size_t i = indexCenter + 1; i <= buttonsCount; i++)
        {
            this->menuPicture[i]->putUnderObj(*this->menuPicture[i - 1]);
        }
    }
}
void menu::shineButton(sf::Color color)
{
    /*for (size_t i = 0; i <= this->buttons.GetCount(); i++)
    {
        if (this->buttons.GetElement(i)->data.trackContainsCursor())
            if (this->buttons.GetElement(i)->data.getColor() != color)
            {
                this->buttons.GetElement(i)->data.setColor(color);
            }
        if (!this->buttons.GetElement(i)->data.trackContainsCursor())
            if (this->buttons.GetElement(i)->data.getColor() == color)
            {
                this->buttons.GetElement(i)->data.setColor(color);
            }
    }*/
}

stackoverflow is asking for details, but I have no more details - sorry. stackoverflow is asking for details, but I have no more details - sorry. stackoverflow is asking for details, but I have no more details - sorry. stackoverflow is asking for details, but I have no more details - sorry. stackoverflow is asking for details, but I have no more details - sorry.

来源：https://stackoverflow.com/questions/59601459/sfml-with-pointers-image-with-vector-and-shared-ptr-not-showing