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| 1 | #ifndef ENGINE_SYSTEM_H | |
| 2 | #define ENGINE_SYSTEM_H | |
| 3 | ||
| 4 | #include <tuple> | |
| 5 | - | #include <util/traits.h> |
| 5 | + | #include "traits.h" |
| 6 | #include <assert.h> | |
| 7 | ||
| 8 | #define MACRO_DECLARE_PROVIDER_ACCESS(provider) \ | |
| 9 | template <typename T> \ | |
| 10 | inline \ | |
| 11 | typename std::enable_if< has_type< T*, provider::SubSystemPtrs >::value, T* >::type \ | |
| 12 | Get(); \ | |
| 13 | \ | |
| 14 | template <typename T> \ | |
| 15 | inline \ | |
| 16 | typename std::enable_if< has_type< T*, provider::SubSystemPtrs >::value, bool >::type \ | |
| 17 | Set(T* ptr); | |
| 18 | ||
| 19 | #define MACRO_DEFINE_PROVIDER_ACCESS(provider) \ | |
| 20 | template <typename T> \ | |
| 21 | inline \ | |
| 22 | typename std::enable_if< has_type< T*, provider::SubSystemPtrs >::value, T* >::type \ | |
| 23 | Get() \ | |
| 24 | { \
| |
| 25 | if(provider::s_pInstance) \ | |
| 26 | return std::get<T*>(provider::s_pInstance->m_SubSystems); \ | |
| 27 | return nullptr; \ | |
| 28 | } \ | |
| 29 | \ | |
| 30 | template <typename T> \ | |
| 31 | inline \ | |
| 32 | typename std::enable_if< has_type< T*, provider::SubSystemPtrs >::value, bool >::type \ | |
| 33 | Set(T *ptr) \ | |
| 34 | { \
| |
| 35 | if(provider::s_pInstance) \ | |
| 36 | { \
| |
| 37 | std::get<T*>(provider::s_pInstance->m_SubSystems) = ptr; \ | |
| 38 | return true; \ | |
| 39 | } \ | |
| 40 | return false; \ | |
| 41 | } | |
| 42 | ||
| 43 | template <typename ...Ts> | |
| 44 | class Provider {
| |
| 45 | private: | |
| 46 | using thisType = Provider<Ts...>; | |
| 47 | using SubSystemPtrs = std::tuple<Ts*...>; | |
| 48 | ||
| 49 | template <typename T> | |
| 50 | friend | |
| 51 | typename std::enable_if< has_type< T*, thisType::SubSystemPtrs >::value, T* >::type | |
| 52 | Get(); | |
| 53 | ||
| 54 | template <typename T> | |
| 55 | friend | |
| 56 | typename std::enable_if< has_type< T*, thisType::SubSystemPtrs >::value, bool >::type | |
| 57 | Set(T* ptr); | |
| 58 | ||
| 59 | static Provider *s_pInstance; | |
| 60 | SubSystemPtrs m_SubSystems; | |
| 61 | ||
| 62 | public: | |
| 63 | Provider() { s_pInstance = this; }
| |
| 64 | ~Provider() { if(s_pInstance == this); s_pInstance = nullptr; }
| |
| 65 | ||
| 66 | template <typename T> | |
| 67 | T* Get(); | |
| 68 | ||
| 69 | template <typename T> | |
| 70 | void Register(T* service); | |
| 71 | ||
| 72 | template <typename T> | |
| 73 | void UnRegister(T* service = nullptr); | |
| 74 | ||
| 75 | // Switching on multiple Providers was not yet thought about | |
| 76 | // void MakeCurrent(); | |
| 77 | }; | |
| 78 | ||
| 79 | template <typename ...Ts> | |
| 80 | Provider<Ts...> *Provider<Ts...>::s_pInstance = nullptr; | |
| 81 | ||
| 82 | template <typename ...Ts> | |
| 83 | template <typename T> | |
| 84 | T* Provider<Ts...>::Get() | |
| 85 | {
| |
| 86 | return std::get<T*>(m_SubSystems); | |
| 87 | } | |
| 88 | ||
| 89 | template <typename ...Ts> | |
| 90 | template <typename T> | |
| 91 | void Provider<Ts...>::Register(T* service) | |
| 92 | {
| |
| 93 | std::get<T*>(m_SubSystems) = service; | |
| 94 | } | |
| 95 | ||
| 96 | template <typename ...Ts> | |
| 97 | template <typename T> | |
| 98 | void Provider<Ts...>::UnRegister(T* service) | |
| 99 | {
| |
| 100 | std::get<T*>(m_SubSystems) = nullptr; | |
| 101 | } | |
| 102 | ||
| 103 | #endif |
