Teuchos - Trilinos Tools Package Version of the Day
Teuchos_toString.hpp
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00041 
00042 #ifndef TEUCHOS_TO_STRING_HPP
00043 #define TEUCHOS_TO_STRING_HPP
00044 
00045 #include "Teuchos_ConfigDefs.hpp"
00046 
00047 
00048 namespace Teuchos {
00049 
00050 
00058 template<typename T>
00059 class ToStringTraits {
00060 public:
00061   static std::string toString( const T &t )
00062     {
00063       std::ostringstream oss;
00064       oss << t;
00065       return oss.str();
00066     }
00067 };
00068 
00069 
00079 template<typename T>
00080 inline
00081 std::string toString(const T& t)
00082 {
00083   return ToStringTraits<T>::toString(t);
00084 }
00085 
00086 
00088 template<>
00089 class ToStringTraits<bool> {
00090 public:
00091   static std::string toString( const bool &t )
00092     {
00093       if (t)
00094         return "true";
00095       return "false";
00096     }
00097 };
00098 
00099 
00101 template<>
00102 class ToStringTraits<std::string> {
00103 public:
00104   static std::string toString( const std::string &t )
00105     {
00106       return t;
00107     }
00108 };
00109 
00111 template<>
00112 class ToStringTraits<double> {
00113 public:
00114   static std::string toString (const double& t) {
00115     std::ostringstream os;
00116     os.setf (std::ios::scientific);
00117     // 17 = round(52 * log10(2)) + 1.  That's one decimal digit more
00118     // than the binary precision justifies, which should be plenty.
00119     // Guy Steele et al. have a better algorithm for floating-point
00120     // I/O, but using a lot of digits is the lazy approach.
00121     os.precision (17);
00122     os << t;
00123     return os.str();
00124   }
00125 };
00126 
00128 template<>
00129 class ToStringTraits<float> {
00130 public:
00131   static std::string toString (const float& t) {
00132     std::ostringstream os;
00133     os.setf (std::ios::scientific);
00134     // 8 = round(23 * log10(2)) + 1.  That's one decimal digit more
00135     // than the binary precision justifies, which should be plenty.
00136     // Guy Steele et al. have a better algorithm for floating-point
00137     // I/O, but using a lot of digits is the lazy approach.
00138     os.precision (8);
00139     os << t;
00140     return os.str();
00141   }
00142 };
00143 
00144 
00145 
00146 } // end namespace Teuchos
00147 
00148 
00149 #endif // TEUCHOS_TO_STRING_HPP
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