Fixing files for seminar 2, adding example

Author: tilir

02-lrefs/clref.cc

@@ -1,11 +1,22 @@
-#include <cstdio>
+//-----------------------------------------------------------------------------
+//
+// Source code for MIPT ILab
+// Slides: https://sourceforge.net/projects/cpp-lects-rus/files/cpp-graduate/
+// Licensed after GNU GPL v3
+//
+//-----------------------------------------------------------------------------
+//
+//  Example for reference binding: displaying addresses
+//
+//----------------------------------------------------------------------------
+
+#include <iostream>
 
 int foo() { return 42; }
 
 int main() {
   int x;
   int &rx = x;
   const int &l = foo();
-  printf("%p\n", &l);
-  printf("%p %p\n", &x, &rx);
+  std::cout << &l << " " << &x << " " << &rx << std::endl;
 }

02-lrefs/newdelete.cc

@@ -0,0 +1,35 @@
+//-----------------------------------------------------------------------------
+//
+// Source code for MIPT ILab
+// Slides: https://sourceforge.net/projects/cpp-lects-rus/files/cpp-graduate/
+// Licensed after GNU GPL v3
+//
+//-----------------------------------------------------------------------------
+//
+//  Example: wrong pairing of new/delete and consequences
+//  compile with: g++ -g newdelete.cc
+//  try x/20x P-1 in gdb
+//
+//----------------------------------------------------------------------------
+
+#include <iostream>
+
+struct MySmallClass {
+  int t = 1;
+  MySmallClass() { std::cout << "small ctor" << std::endl; }
+  ~MySmallClass() { std::cout << "small dtor" << std::endl; }
+};
+
+struct MyBigClass {
+  int t = 1, p = 2, q = 3;
+  MyBigClass() { std::cout << "big ctor" << std::endl; }
+  ~MyBigClass() { std::cout << "big dtor" << std::endl; }
+};
+
+int main() {
+  MyBigClass *S = new MyBigClass;
+  MySmallClass *T = new MySmallClass;
+  MyBigClass *P = new MyBigClass[5];
+  MySmallClass *Q = new MySmallClass[7];
+  delete[] T; // terribly wrong
+}

02-lrefs/ptref.cc

@@ -1,3 +1,16 @@
+//-----------------------------------------------------------------------------
+//
+// Source code for MIPT ILab
+// Slides: https://sourceforge.net/projects/cpp-lects-rus/files/cpp-graduate/
+// Licensed after GNU GPL v3
+//
+//-----------------------------------------------------------------------------
+//
+//  Example: function signature for pointer and reference
+//  compile with: g++ -O1 -g0 -masm=intel -S ptref.cc
+//
+//----------------------------------------------------------------------------
+
 int g;
 
 void foo(int *x) { g = *x; }

02-lrefs/spacial.cc

@@ -1,7 +1,13 @@
+//-----------------------------------------------------------------------------
+//
+// Source code for MIPT ILab
+// Slides: https://sourceforge.net/projects/cpp-lects-rus/files/cpp-graduate/
+// Licensed after GNU GPL v3
+//
 //----------------------------------------------------------------------------
 //
 //  Example for triangle intersection
-//  Originated from homework of D. Bushev
+//  Originated from homework of Dmitry Bushev
 //
 //----------------------------------------------------------------------------
 

02-lrefs/triangles/lingeo.hpp

@@ -1,14 +1,29 @@
-#include "lingeo.hpp"
+//-----------------------------------------------------------------------------
+//
+// Source code for MIPT ILab
+// Slides: https://sourceforge.net/projects/cpp-lects-rus/files/cpp-graduate/
+// Licensed after GNU GPL v3
+//
+//-----------------------------------------------------------------------------
+//
+//  Example: triangle intersection, driver program
+//
+//----------------------------------------------------------------------------
+
+#include <cassert>
 #include <iostream>
 #include <vector>
 
+#include "lingeo.hpp"
+
 polygon_t input_triangle() {
   std::vector<point_t> verts(3);
   point_t temp;
   for (int i = 0; i < 3; i++) {
     std::cin >> temp.x;
     std::cin >> temp.y;
     verts[i] = temp;
+    assert(std::cin.good());
   }
   polygon_t ret{verts};
   return ret;