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C-/C++-Quelltext

#ifndef RESOURCEMANAGER_HPP
#define RESOURCEMANAGER_HPP

#include <string>
#include <map>

template<class ObjectType, class IdentifierType = std::string>
class CResourceManager
{
protected:
    typedef ObjectType OT;
    typedef IdentifierType IT;
    std::map<IT, OT> _Resources;
    class _DataNotFound{};


public:
    CResourceManager(){}
    virtual void loadResource(IT p_ResourceIdentifier) = 0;
    OT* getResource(IT p_ResourceIdentifier);
    virtual ~CResourceManager(){}
};

#endif

C-/C++-Quelltext

#include "ResourceManager.hpp"
#include <algorithm>

template<class ObjectType, class IdentifierType> ObjectType* CResourceManager<ObjectType, IdentifierType>::getResource(IdentifierType p_ResourceIdentifier)
{
    std::map<IT, OT>::iterator i;
    i = find(_Resources.begin(), _Resources.end(), p_ResourceIdentifier);
    if (i==_Resources.end()) throw _DataNotFound();
    return &(i->second);
}

C-/C++-Quelltext

#ifndef IMAGEMANAGER_HPP
#define IMAGEMANAGER_HPP

#include "ResourceManager.hpp"
#include <SFML/Graphics.hpp>

class CImageManager : public CResourceManager<sf::Image>
{
private:
    class _BadImage{};
public:
    void loadResource(std::string p_ResourceName);

};

#endif

C-/C++-Quelltext

#include "ImageManager.hpp"

void CImageManager::loadResource(std::string p_ResourceName)
{
    sf::Image Image;

    if(!Image.LoadFromFile(p_ResourceName))
    {
        throw _BadImage();
    }

    _Resources[p_ResourceName] = Image;
}

C-/C++-Quelltext

Game.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""public: class sf::Image * __thiscall CResourceManager<class sf::Image,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::getResource(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?getResource@?$CResourceManager@VImage@sf@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@@QAEPAVImage@sf@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)" in Funktion ""public: class sf::Image * __thiscall CFramework::getImage(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?getImage@CFramework@@QAEPAVImage@sf@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)".