1 files changed, 113 insertions, 0 deletions
diff --git a/include/sibs/Functional.hpp b/include/sibs/Functional.hpp
new file mode 100644
index 0000000..53d8ff0
--- /dev/null
+++ b/include/sibs/Functional.hpp
@@ -0,0 +1,113 @@
+#pragma once
+
+#include <vector>
+
+namespace sibs
+{
+    template <typename T>
+    class Function;
+
+    template <typename T>
+    class FunctionIterator
+    {
+    public:
+        FunctionIterator(T *_it, Function<T> *_func, std::size_t _funcIndex) : 
+            it(_it),
+            func(_func),
+            funcIndex(_funcIndex)
+        {
+
+        }
+
+        bool operator == (FunctionIterator<T> &rhs) const
+        {
+            return it == rhs.it && funcIndex == rhs.funcIndex;
+        }
+
+        bool operator != (FunctionIterator<T> &rhs) const
+        {
+            return !(*this == rhs);
+        }
+
+        T& operator * ()
+        { 
+            return *it;
+        }
+
+        void operator ++ ()
+        {
+            ++it;
+            if(it == func->endIt)
+            {
+                if(funcIndex < func->connections.size())
+                {
+                    it = func->connections[funcIndex].beginIt;
+                    ++funcIndex;
+                }
+            }
+        }
+    private:
+        T *it;
+        Function<T> *func;
+        std::size_t funcIndex;
+    };
+
+    template <typename T>
+    class Function
+    {
+        friend class FunctionIterator<T>;
+    public:
+        typedef FunctionIterator<T> iterator;
+        typedef const FunctionIterator<T> const_iterator;
+
+        Function(T *begin, T *end) : 
+            beginIt(begin),
+            endIt(end)
+        {
+            
+        }
+
+        Function(std::vector<T> &vec) : 
+            beginIt(vec.data()),
+            endIt(vec.data() + vec.size())
+        {
+            
+        }
+
+        Function& merge(Function &otherFunc)
+        {
+            connections.push_back(otherFunc);
+            return *this;
+        }
+
+        iterator begin()
+        {
+            return FunctionIterator<T>(beginIt, this, 0);
+        }
+
+        iterator end()
+        {
+            T *it = endIt;
+            if(!connections.empty())
+                it = connections.back().endIt;
+            return FunctionIterator<T>(it, this, connections.size());
+        }
+
+        const_iterator begin() const
+        {
+            return FunctionIterator<T>(beginIt, this, 0);
+        }
+
+        const_iterator end() const
+        {
+            T *it = endIt;
+            if(!connections.empty())
+                it = connections.back().endIt;
+            return FunctionIterator<T>(it, this, connections.size());
+        }
+    private:
+        T *beginIt;
+        T *endIt;
+        std::vector<Function> connections;
+    };
+}