Created
April 19, 2018 04:59
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Function node which accept any type of variable.
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| #include <iostream> | |
| #include <vector> | |
| #include <memory> | |
| #include <typeinfo> | |
| #include <cstring> | |
| class Variable { | |
| public: | |
| template<typename T, typename... Args> | |
| void create(Args... args) { | |
| set(std::make_shared<T>(args...)); | |
| } | |
| template<typename T> | |
| void set(std::shared_ptr<T> v) { | |
| data = v; | |
| type = &typeid(T); // The lifetime extends to the end of the program. | |
| } | |
| template<typename T> | |
| std::shared_ptr<T> getWriter() { | |
| if (*type != typeid(T)) { | |
| // Create by force | |
| create<T>(); | |
| } | |
| return std::static_pointer_cast<T>(data); | |
| } | |
| template<typename T> | |
| std::shared_ptr<T> getReader() const { | |
| if (*type != typeid(T)) { | |
| // Invalid type cast | |
| std::cerr << "Invalid cast (" << type->name() << " vs " | |
| << typeid(T).name() << ")" << std::endl; | |
| return std::make_shared<T>(); | |
| } | |
| return std::static_pointer_cast<T>(data); | |
| } | |
| private: | |
| std::shared_ptr<void> data; | |
| const std::type_info *type = &typeid(void); | |
| }; | |
| class FunctionNode { | |
| public: | |
| virtual void build(const std::vector<Variable *> &args) = 0; | |
| virtual void apply() = 0; | |
| }; | |
| class Add : public FunctionNode { | |
| public: | |
| void build(const std::vector<Variable*> &args) { | |
| if (args.size() != 3) { | |
| std::cerr << "Invalid arguments" << std::endl; | |
| return; | |
| } | |
| a = args[0]->getReader<int>(); | |
| b = args[1]->getReader<int>(); | |
| c = args[2]->getWriter<int>(); | |
| } | |
| void apply() { | |
| *c = *a + *b; | |
| } | |
| private: | |
| std::shared_ptr<int> a, b, c; | |
| }; | |
| int main(int argc, char const* argv[]) { | |
| Variable v3; | |
| Add add; | |
| FunctionNode *node = &add; | |
| { | |
| // Create with variable creation | |
| Variable v1, v2; | |
| v1.create<int>(123); | |
| v2.create<int>(456); | |
| // Correct cast | |
| std::cout << *(v1.getReader<int>()) << std::endl; | |
| std::cout << *(v2.getReader<int>()) << std::endl; | |
| node->build({&v1, &v2, &v3}); | |
| } | |
| node->apply(); | |
| std::cout << *(v3.getReader<int>()) << std::endl; | |
| return 0; | |
| } |
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