initial commit, let's just do this instead of studying. also hail Bjarne

.gitignore

@@ -0,0 +1,10 @@
+.idea
+.DS_Store
+*.out
+CMakeFiles
+CMakeCache.txt
+cmake_install.cmake
+Makefile
+Function
+build
+cmake-build-debug

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.6)
+project(Function)
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic")
+
+set(SOURCE_FILES main.cpp)
+add_executable(Function ${SOURCE_FILES})

Function.hpp

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+template <typename Fun>
+class Function;
+
+
+template <typename Ret, typename... Args>
+class function
+{
+    // TODO: everything :'D
+};

main.cpp

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+#include <iostream>
+#include <cmath>
+#include "Function.hpp"
+
+
+
+int main()
+{
+    Function<double(double)> f;
+
+    if (!f)
+        std::cout << "Egyelőre nullptr" << std::endl;
+
+    f = sin;
+    std::cout << sin(2.3) << "==" << f(2.3) << std::endl;
+
+    f = [] (double x) { return x*x; };
+    std::cout << 2.3*2.3 << "==" << f(2.3) << std::endl;
+
+    f = std::bind(pow, std::placeholders::_1, 4);
+    std::cout << pow(2.3, 4) << "==" << f(2.3) << std::endl;
+
+    f = nullptr;
+    try {
+        f(2.3);
+    } catch (std::bad_function_call &e) {
+        std::cout << "Megint nullptr" << std::endl;
+    }
+}