update cpp example, small fix for c++

Author: ladisgin

integration-tests/cpp-example/Refs.cpp

@@ -51,7 +51,7 @@ Point_2d operator-(Point_2d lhs, const Point_2d& rhs) {
 }
 
 
-double get_dist(const Point_2d& lhs, Point_2d& rhs) {
+double get_dist(const Point_2d& lhs, const Point_2d& rhs) {
     auto t = lhs - rhs;
     return t.get_dist_to_zero();
 }

integration-tests/cpp-example/Refs.h

@@ -6,8 +6,9 @@
 #define POINT_2D_HPP
 
 class Point_2d {
-public:
+private:
   int x;
+public:
   int y;
 
   Point_2d();
@@ -24,12 +25,15 @@ class Point_2d {
   friend Point_2d operator-(Point_2d lhs, const Point_2d& rhs);
 
   double get_dist_to_zero() const;
+  friend double get_dist(const Point_2d& lhs, const Point_2d& rhs);
+  friend void set_to_zero(Point_2d& point);
+  friend void set_abs_by_ref(Point_2d& point);
 };
 
 Point_2d operator+(const Point_2d& lhs, const Point_2d& rhs);
 Point_2d operator-(Point_2d lhs, const Point_2d& rhs);
 
-double get_dist(const Point_2d& lhs, Point_2d& rhs);
+double get_dist(const Point_2d& lhs, const Point_2d& rhs);
 
 void set_to_zero(Point_2d& point);
 

integration-tests/cpp-example/SimpleClass.cpp

@@ -2,7 +2,8 @@
  * Copyright (c) Huawei Technologies Co., Ltd. 2012-2021. All rights reserved.
  */
 
-#include "triangle.hpp"
+#include "triangle.h"
+#include "point_2d.hpp"
 #include <cmath>
 
 
@@ -35,9 +36,9 @@ double Triangle::get_perimeter() {
 }
 
 double Triangle::get_area() {
-    auto side1 = get_dist(vertex[0], vertex[1]);
-    auto side2 = get_dist(vertex[1], vertex[2]);
-    auto side3 = get_dist(vertex[2], vertex[0]);
+    double side1 = get_dist(vertex[0], vertex[1]);
+    double side2 = get_dist(vertex[1], vertex[2]);
+    double side3 = get_dist(vertex[2], vertex[0]);
     auto p = this->get_perimeter();
     return sqrt(p * (p - side1) * (p - side2) * (p - side3));
 }