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POError in templates in probably wrong designed resource manager
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  1. POError in templates in probably wrong designed resource manager
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    copied!<p>I'm creating my first game. It will be Pacman or Snake. I'm going to use DirectX 11.</p> <p>I'm writing resource manager at the moment. I want to create it the most simple to use but I think that it is not well designed. Here's what I wrote:</p> <pre><code>#pragma once class Shader; class Mesh; class Texture; typedef std::map&lt;std::string, std::auto_ptr&lt;Shader&gt;&gt; shaders_map; typedef std::map&lt;std::string, std::auto_ptr&lt;Mesh&gt;&gt; meshes_map; typedef std::map&lt;std::string, std::auto_ptr&lt;Texture&gt;&gt; textures_map; template&lt;class C, class E&gt; inline int findElementInMap(const C&amp; cont, E *ptr) { C::const_iterator it = cont.begin(); int i = 0; while(it != cont.end()) { if(it-&gt;second.get() == ptr) // ERROR AT THIS LINE!!!! return i; i++; it++; } return -1; } class ResourceManager { public: ResourceManager(void); ~ResourceManager(void); template&lt;class T&gt; inline T* get(const std::string &amp;name) { if(typeid(T) == typeid(Shader)) { return (T*)getShader(name); } else if(typeid(T) == typeid(Mesh)) { return (T*)getMesh(name); } else if(typeid(T) == typeid(Texture)) { return (T*)getTexture(name); } return nullptr; } Shader* getShader(const std::string &amp;name); Mesh* getMesh(const std::string &amp;name); Texture* getTexture(const std::string &amp;name); template&lt;class T&gt; inline bool add(T *ptr) { if(typeid(T) == typeid(Shader)) { return addShader((Shader*)((void*)ptr)); } else if(typeid(T) == typeid(Mesh)) { return addMesh((Mesh*)((void*)ptr)); } else if(typeid(T) == typeid(Texture)) { return addTexture((Texture*)((void*)ptr)); } return false; } bool addShader(Shader *ptr); bool addMesh(Mesh *ptr); bool addTexture(Texture *ptr); template&lt;class E&gt; inline void release(E *ptr) { if(typeid(E) == typeid(Shader)) { release&lt;shaders_map, E&gt;(shaders, (E*)((void*)ptr)); return; } else if(typeid(E) == typeid(Mesh)) { release&lt;meshes_map, E&gt;(meshes, (E*)((void*)ptr)); return; } else if(typeid(E) == typeid(Texture)) { release&lt;textures_map, E&gt;(textures, ptr); } } // THIS METHOD CAUSES PROBLEM template&lt;class C, class E&gt; void release(C &amp;container, E *ptr) { assert(ptr != nullptr); int index = findElementInMap&lt;C, E&gt;(container, ptr); if(index &lt; 0) return; C::iterator it = container.begin(); it-&gt;second.release(); } private: shaders_map shaders; meshes_map meshes; textures_map textures; }; </code></pre> <p>And now compile error:</p> <pre><code>error C2440: '==' : cannot convert from 'Shader *' to 'Mesh *' int findElementInMap&lt;C,E&gt;(const C &amp;,E *)' being compiled with [ C=textures_map, E=Shader ] </code></pre> <p>So the container type and the element type don't match. Any ideas on how to set it work?</p> <p>Or should I build new resource manager from scratch?</p> <p>Edit: That's how I use this class:</p> <pre><code> Shader *sh = new Shader(); resourceManager.add&lt;Shader&gt;(sh); resourceManager.release&lt;Shader&gt;(sh); </code></pre>
 

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