boost::numeric_cast is a safe number conversion function that throws an exception if the conversion cannot succeed.

In the example below, the highest possible int is converted to a short. Because this will fail, boost::numeric_cast throws an exception.


#include <boost/static_assert.hpp>

#include <boost/numeric/conversion/cast.hpp>

#include <boost/limits.hpp>



int main()

{

  //Assume that short occupies less storage in memory than int.

  BOOST_STATIC_ASSERT(sizeof(short) < sizeof(int));



  //Obtain the highest integer value.

  const int x = boost::numeric::bounds<int>::highest();



  //Try to store the highest integer value as a short.

  //This will throw boost::numeric::positive_overflow,

  //because a short occupies to few memory to store such

  //a large number.

  const short y = boost::numeric_cast<short>(x);

}

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(C++) boost::numeric_cast