Converting Between Numeric Types such as an int to a short or a vice versa, catch any overflow or underflow errors at runtime. - C++ boost

C++ examples for boost:Number

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Description

Converting Between Numeric Types such as an int to a short or a vice versa, catch any overflow or underflow errors at runtime. 

#include <iostream>
#include <boost/cast.hpp>

using namespace std;
using boost::numeric_cast;
using boost::bad_numeric_cast;

int main() {
   try {
      int i = 32767;
      short s = numeric_cast<short>(i);

      cout << "s = " << s << endl;

      i++; // Now i is out of range (if sizeof(short) is 2)
      s = numeric_cast<short>(i);
   }
   catch (bad_numeric_cast& e) {
      cerr << e.what() << endl;
   }

   try {
      int i = 300;
      unsigned int ui = numeric_cast<unsigned int>(i);

      cout << ui << endl; // Fine

      i *= -1;
      ui = numeric_cast<unsigned int>(i); // i is negative!
   }
   catch (bad_numeric_cast& e) {
      cerr << e.what() << endl;
   }

   try {
      double d = 3.14;
      int i = numeric_cast<int>(d);

      i = numeric_cast<int>(d); // This shaves off the 0.14!

      cout << i << endl;  // i = 3

   }
   catch (bad_numeric_cast& e) {
      cerr << e.what() << endl;
   }
}

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