[ub] Applied suggestions from code review

Author: timuraudio

source/ub.tex

@@ -28,10 +28,10 @@
 \begin{codeblock}
 void f()
 {
-  void *p = malloc(sizeof(int) + sizeof(float));    // undefined behavior, cannot create
-                                                    // both int and float in same place
-  int& i = *reinterpret_cast<int*>(p);
-  float& f = *reinterpret_cast<float*>(p);
+  void *p = malloc(sizeof(int) + sizeof(float));
+  *reinterpret_cast<int*>(p) = 0;
+  *reinterpret_cast<float*>(p) = 0.0f;   // undefined behavior, cannot create
+                                         // both int and float in same place
 }
 \end{codeblock}
 \end{example}
@@ -126,7 +126,7 @@
   ~S() {}
 };
 
-float f() {
+void f() {
   S* p = new S;
   p->~S();
   delete p;     // undefined behavior, operand of delete, lifetime has ended and \tcode{S}
@@ -739,12 +739,12 @@
 \pnum
 \begin{example}
 \begin{codeblock}
-    int main() {
-      __uint128_t x2 = -1;
-      float f = x2; // undefined behavior on systems where the range of
-      // representable values of float is [-max,+max] on system where
-      // represetable values are [-inf,+inf] this would not be UB
-    }
+int main() {
+  __uint128_t x2 = -1;
+  float f = x2; // undefined behavior on systems where the range of
+  // representable values of float is [-max,+max] on system where
+  // represetable values are [-inf,+inf] this would not be UB
+}
 \end{codeblock}
 \end{example}
 
@@ -857,11 +857,11 @@
 \pnum
 \begin{example}
 \begin{codeblock}
-    struct B { virtual ~B(); };
-    void f() {
-      B bs[1];
-      B* dp = dynamic_cast<B*>(bs+1);   // undefined behavior
-    }
+struct B { virtual ~B(); };
+void f() {
+  B bs[1];
+  B* dp = dynamic_cast<B*>(bs+1);   // undefined behavior
+}
 \end{codeblock}
 \end{example}