Category : stdmap

I have an error when building a C++ project: Error C2678 binary ‘<‘: no operator found which takes a left-hand operand of type ‘const _Ty’ (or there is no acceptable conversion) SystemModels In build output: C:Program Files (x86)Microsoft Visual Studio19EnterpriseVCToolsMSVC.28.29910includexstddef(127,1): error C2678: binary ‘<‘: no operator found which takes a left-hand operand of type ‘const ..

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A program has an interface called Component: class Component { public: virtual void Start() = 0; virtual void Update() = 0; }; This interface is implemented by MeshComponent: .h #include "Component.h" #include "Mesh.h" class MeshComponent: public Component { public: Mesh* mesh; int a = 0; // for test MeshComponent(); void Start(); void Update(); }; .cpp ..

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Following lines of C++ code gives runtime error but if erase operation mymap.erase(v) is removed it works: map<int,int> mymap = {{1,0},{2,1},{9,2},{10,3},{11,4}}; for(auto it=mymap.rbegin();it!=mymap.rend();){ int v=it->first; ++it; mymap.erase(v); } demo Here iterator it is changed before deleting its value v, so iterator it should remain unaffected I believe. Source: Windows Que..

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I have a std::map of strings keyed by integers. I want the map to be readonly. const std::map<int, std::string> myMap = {values}; When I try and access a value via the subscript operator std::string value = myMap[intKey]; I get a compile error "E0349 no operator "[]" matches these operands." If I remove the const from ..

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