Merge pull request #38 from vladon/patch-1

Update 04-Considering_Safety.md

Author: lefticus

04-Considering_Safety.md

@@ -140,11 +140,13 @@ Use the C++-style cast (static\_cast<>, dynamic\_cast<> ...) instead of the C-st
 double x = getX();
 int i = (int) x;
 
-// Good Idea
+// Not a Bad Idea
 int i = static_cast<int>(x);
 ```
 Additionally the C++ cast style is more visible and has the possibility to search for.
 
+But consider refactoring of program logic (for example, additional checking on overflow and underflow) if you need to cast `double` to `int`. Measure three times and cut 0.9999999999981 times.
+
 ## Additional Resources
 
 [How to Prevent The Next Heartbleed](http://www.dwheeler.com/essays/heartbleed.html) by David Wheeler is a good analysis of the current state of code safety and how to ensure safe code.