Describe how to stringify double values with a requested precision.

[hobovsky]

Present how to use custom stringizers to prevent confusing assertion messages when working with double values:

#include <sstream>
#include <iomanip>

namespace snowhouse {

  template<>
  struct Stringizer<double>
  {
    static std::string ToString(double value)
    {
      std::ostringstream oss;
      oss << std::setprecision(15) << value;
      return oss.str();
    }
  };
}