abstract-class

问题 I know this question was asked several time, but i don't find how to resolve it. I get this error when i'm trying to build my project: error LNK2019: unresolved external symbol "public: virtual __thiscall IGameState::~IGameState(void)" (??1IGameState@@UAE@XZ) in function "public: virtual __thiscall MenuState::~MenuState(void)" (??1MenuState@@UAE@XZ) Here is my code: IGameState.h class IGameState { public: virtual ~IGameState(); virtual void update() = 0; virtual void render() = 0; };

来源： https://stackoverflow.com/questions/64350650/is-it-possible-to-serialize-nested-complex-classes-with-nlohmann-json

来源： https://stackoverflow.com/questions/64350650/is-it-possible-to-serialize-nested-complex-classes-with-nlohmann-json

来源： https://stackoverflow.com/questions/31201706/abstract-base-class-is-not-enforcing-function-implementation

来源： https://stackoverflow.com/questions/31201706/abstract-base-class-is-not-enforcing-function-implementation

来源： https://stackoverflow.com/questions/31201706/abstract-base-class-is-not-enforcing-function-implementation

来源： https://stackoverflow.com/questions/29334843/how-to-extend-an-abstract-class-with-factory-constructor

来源： https://stackoverflow.com/questions/33399111/how-to-jaxb-marshall-javafx-property-classes-when-class-is-xmlaccesstype-none

来源： https://stackoverflow.com/questions/21531860/how-to-bind-a-subclass-of-an-abstract-class-in-a-spring-mvc-method

来源： https://stackoverflow.com/questions/21531860/how-to-bind-a-subclass-of-an-abstract-class-in-a-spring-mvc-method