Created
August 29, 2017 04:12
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constexpr GCC errors
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| // Example program | |
| #include <type_traits> | |
| #include <stdint.h> | |
| #include <vector> | |
| #include <cstddef> | |
| #include <iostream> | |
| enum class InputActionType : uint8_t | |
| { | |
| Nothing, | |
| BuildItem, | |
| StartMoving, | |
| }; | |
| class InputAction | |
| { | |
| public: | |
| template<InputActionType ActionType, class T> | |
| struct ActionTypeAlias | |
| { | |
| using type = T; | |
| static constexpr InputActionType action_type = ActionType; | |
| static constexpr auto no_data = std::is_void<T>::value; | |
| constexpr operator InputActionType() const | |
| { | |
| return ActionTypeAlias<ActionType, T>::action_type; | |
| } | |
| }; | |
| static constexpr ActionTypeAlias<InputActionType::Nothing, void> Nothing = {}; | |
| static constexpr ActionTypeAlias<InputActionType::BuildItem, bool> BuildItem = {}; | |
| static constexpr ActionTypeAlias<InputActionType::StartMoving, bool> StartMoving = {}; | |
| }; | |
| class Controller {}; | |
| class GameActionHandler | |
| { | |
| public: | |
| using ControllerAction = void (GameActionHandler::*)(const InputAction&, Controller*); | |
| template<class T> | |
| static void addToActions(InputActionType action, T function, std::vector<T>& result) | |
| { | |
| if (result.size() <= size_t(action)) | |
| result.resize(size_t(action) + 1); | |
| result[size_t(action)] = function; | |
| } | |
| void buildItem(const InputAction&, Controller*) {} | |
| void startMoving(const InputAction&, Controller*) {} | |
| static std::vector<ControllerAction> getControllerActions() | |
| { | |
| std::vector<ControllerAction> result; | |
| GameActionHandler::addToActions(InputAction::BuildItem, &GameActionHandler::buildItem, result); | |
| GameActionHandler::addToActions(InputAction::StartMoving, &GameActionHandler::startMoving, result); | |
| return result; | |
| } | |
| }; | |
| int main() | |
| { | |
| auto actions = GameActionHandler::getControllerActions(); | |
| std::cout << actions.size(); | |
| }; |
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