#include <map>
#include <memory>
using namespace std;
 
typedef int AssetId;
struct Material {
    int _id;
    Material(int id) : _id(id) {}
    int AssetId() const { return _id; }
};
typedef std::map< AssetId, std::shared_ptr<Material> > MaterialsMap;    
 
MaterialsMap  m_materials;
 
int main() {
    std::shared_ptr<Material> pMaterial(new Material(42));
    m_materials.insert( MaterialsMap::value_type(pMaterial->AssetId(), pMaterial) );
}
 

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