Implement task 11.01

Author: c71n93

week-12/task-11-01/include/self-pointed-function.hpp

@@ -1,13 +1,15 @@
 #pragma once
 
-namespace functions {
-
 #include <iostream>
 
-int function(int x) { return x; }
-
-using FunctionPtr = decltype(&function);
+namespace functions {
 
-FunctionPtr intermediary() { return function; }
+std::function<void(int& p)> do_it(int& param) {
+    param++;
+    static int counter = 1;
+    std::cout << "do it #" << counter << ": param = " << param << std::endl;
+    counter++;
+    return [](int& p) { do_it(p); };
+}
 
 }  // namespace functions

week-12/task-11-01/test/test-11-01.cpp

@@ -1,11 +1,13 @@
 #include "gtest/gtest.h"
 #include "self-pointed-function.hpp"
 
-using functions::FunctionPtr;
-using functions::intermediary;
+using functions::do_it;
 
 TEST(SelfPointedFunction, Call) {
-    FunctionPtr f = intermediary();
-    constexpr int x = 10;
-    EXPECT_EQ(f(x), x);
+    constexpr int initial = 42;
+    int var = initial;  // NOLINT
+    auto do_it_again = do_it(var);
+    EXPECT_EQ(var, initial + 1);
+    do_it_again(var);
+    EXPECT_EQ(var, initial + 2);
 }