Teuchos - Trilinos Tools Package Version of the Day
Teuchos_Utils.cpp
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00004 //                    Teuchos: Common Tools Package
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00041 
00042 #include "Teuchos_Utils.hpp"
00043 #include "Teuchos_GlobalMPISession.hpp"
00044 
00045 namespace Teuchos {
00046 
00047 double Utils::chopVal_ = 1.0e-16;
00048 
00049 double Utils::chop(const double& x) 
00050 {
00051   if (std::fabs(x) < chopVal_) return 0;
00052   return x;
00053 }
00054 
00055 std::string Utils::trimWhiteSpace( const std::string& str )
00056 {
00057   typedef std::string::size_type size_type;
00058   const size_type len = str.length();
00059   size_type first_non_white = 0;
00060   for(
00061     first_non_white = 0 ;
00062     isWhiteSpace(str[first_non_white]) && first_non_white < len ;
00063     ++first_non_white
00064     );
00065   // Above, if only whitespace is found, then first_non_white==len on
00066   // termination of the loop!
00067   size_type last_non_white = 0;
00068   for(
00069     last_non_white = len-1 ;
00070     isWhiteSpace(str[last_non_white]) && (last_non_white != 0);
00071     --last_non_white
00072     );
00073   // Above, if only whitespace is found, last_non_white==0 on termination of
00074   // the loop!
00075   if( first_non_white > last_non_white )
00076     return std::string(""); // The std::string is all whitespace!
00077   return str.substr(first_non_white,last_non_white-first_non_white+1);
00078 }
00079 
00080 std::string Utils::toString(const int& x)
00081 {
00082   char s[100];
00083   std::sprintf(s, "%d", x);
00084   return std::string(s);
00085 }
00086 
00087 std::string Utils::toString(const unsigned int& x)
00088 {
00089   char s[100];
00090   std::sprintf(s, "%d", x);
00091   return std::string(s);
00092 }
00093 
00094 std::string Utils::toString(const double& x)
00095 {
00096   char s[100];
00097   std::sprintf(s, "%g", x);
00098   return std::string(s);
00099 }
00100 
00101 std::string Utils::getParallelExtension(
00102   int         procRank_in
00103   ,int        numProcs_in
00104   )
00105 {
00106 
00107   int        procRank = -1;
00108   int        numProcs = -1;
00109   if( numProcs_in > 0 ) {
00110     procRank = procRank_in;
00111     numProcs = numProcs_in;
00112   }
00113   else {
00114     procRank = Teuchos::GlobalMPISession::getRank();
00115     numProcs = Teuchos::GlobalMPISession::getNProc();
00116   }
00117 
00118   int maxProcOrder = 1;
00119   double tmp = numProcs;
00120   for( int i = 0; i < 10; ++i, tmp *= 0.1 ) {
00121     if(tmp >= 1.0)
00122       ++maxProcOrder;
00123     else
00124       break;
00125   }
00126 
00127   std::ostringstream parallelExtension;
00128   parallelExtension
00129     << std::setfill('0')
00130     << std::right << std::setw(maxProcOrder)
00131     << numProcs
00132     << "."
00133     << std::setfill('0')
00134     << std::right << std::setw(maxProcOrder)
00135     << procRank;
00136   return parallelExtension.str();
00137 }
00138 
00139 } // end namespace Teuchos
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