Sprite 在 SFML 中是白色方块

Question

我创建了一个模板，该模板将保存指向任何类型资产的指针及其名为 ResourceHolder 的 ID，但是当我使用此模板实例中的纹理指针将纹理加载到精灵时，它是白色正方形。 这是我在 ResourceHolder.hpp 中的代码：

#ifndef RESOURCEEHOLDER_H
#define RESOURCEHOLDER_H
#include "TexturesId.h"
#include "assert.h"
#include <SFML/Graphics.hpp>
#include <stdexcept>
#include <memory>
#include <string>
#include <map>
using namespace sf;
template<typename Resource,typename Identifier>

class ResourceHolder
{
    public:
        void load(Identifier id,const std::string &filename);
        Resource& get(Identifier id);
        const Resource& get(Identifier id) const;
    protected:

    private:
        std::map<Identifier,std::unique_ptr<Resource>> mResourceMap;
};

#endif // TEXTUREHOLDER_H

然后在 ResourceHolder.cpp 中编码

#include "ResourceHolder.h"
using namespace sf;

template<typename Resource,typename Identifier>
void ResourceHolder<Resource,Identifier>::load(Identifier id,const std::string& filename)
{
    std::unique_ptr<Resource> resource(new Resource());
    if(!(resource->loadFromFile(filename)))
       {
           throw std::runtime_error("TextureHolder failed to load " + filename);
       }
    auto inserted=mResourceMap.insert(std::make_pair(id,std::move(resource)));
    assert(inserted.second);
}
template<typename Resource,typename Identifier>
Resource& ResourceHolder<Resource,Identifier>::get(Identifier id)
{
    auto found=mResourceMap.find(id);
    assert(found!=mResourceMap.end());
    return *found->second;
}
template<typename Resource,typename Identifier>
const Resource& ResourceHolder<Resource,Identifier>::get(Identifier id) const
{
    auto found=mResourceMap.find(id);
    assert(found!=mResourceMap.end());
    return *found->second;
}
template class ResourceHolder<Texture,Textures::ID>;

TextureId.h：

#ifndef TEXTURESID_H_INCLUDED
#define TEXTURESID_H_INCLUDED
namespace Textures
{
    enum ID{Landsape,Airplane,Missile};
}

#endif // TEXTURESID_H_INCLUDED

最后在 Game.cpp 中

Game::Game(int x,int y,std::string &Name)
:window(VideoMode(x,y),Name),texture(),
mPlayer()
{
    ResourceHolder<Texture,Textures::ID> th;
    th.load(Textures::ID::Airplane,"plane.png");
    Texture texture=th.get(Textures::ID::Airplane);
    mPlayer.setTexture(texture);
    mPlayer.setPosition(window.getSize().x/2,window.getSize().y/2);
}

Answer 1

有问题的代码是 Game.cpp 中的代码

Game::Game(int x,int y,std::string &Name)
:window(VideoMode(x,y),Name),texture(),
mPlayer()
{
    ResourceHolder<Texture,Textures::ID> th;
    th.load(Textures::ID::Airplane,"plane.png");
    Texture texture=th.get(Textures::ID::Airplane);
    mPlayer.setTexture(texture);
    mPlayer.setPosition(window.getSize().x/2,window.getSize().y/2);
}

ResourceHolder 和 Texture 仅存在于 Game 构造函数的本地范围内。一旦构造函数被执行，rh 和texture 都将超出范围，并且精灵对纹理的引用无效，从而导致white square problem。