1 files changed, 41 insertions, 0 deletions
diff --git a/src/boost/libs/safe_numerics/example/example6.cpp b/src/boost/libs/safe_numerics/example/example6.cpp
new file mode 100644
index 000000000..fbd44a8e3
--- /dev/null
+++ b/src/boost/libs/safe_numerics/example/example6.cpp
@@ -0,0 +1,41 @@
+#include <stdexcept>
+#include <sstream>
+#include <iostream>
+
+#include <boost/safe_numerics/safe_integer.hpp>
+
+int main(int, const char *[]){
+    // problem: checking of externally produced value can be overlooked
+    std::cout << "example 6: ";
+    std::cout << "checking of externally produced value can be overlooked" << std::endl;
+    std::cout << "Not using safe numerics" << std::endl;
+
+    std::istringstream is("12317289372189 1231287389217389217893");
+
+    try{
+        int x, y;
+        is >> x >> y; // get integer values from the user
+        std::cout << x << ' ' << y << std::endl;
+        std::cout << "error NOT detected!" << std::endl;
+    }
+    catch(const std::exception &){
+        std::cout << "error detected!" << std::endl;
+    }
+
+    // solution: assign externally retrieved values to safe equivalents
+    std::cout << "Using safe numerics" << std::endl;
+    {
+        using namespace boost::safe_numerics;
+        safe<int> x, y;
+        is.seekg(0);
+        try{
+            is >> x >> y; // get integer values from the user
+            std::cout << x << ' ' << y << std::endl;
+            std::cout << "error NOT detected!" << std::endl;
+        }
+        catch(const std::exception & e){
+            std::cout << "error detected:"  << e.what() << std::endl;
+        }
+    }
+    return 0;
+}