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   if (len==0) {
00060       return str;
00061     }
00062   size_type first_non_white = 0;
00063   for(
00064     first_non_white = 0 ;
00065     isWhiteSpace(str[first_non_white]) && first_non_white < len ;
00066     ++first_non_white
00067     );
00068   // Above, if only whitespace is found, then first_non_white==len on
00069   // termination of the loop!
00070   size_type last_non_white = 0;
00071   for(
00072     last_non_white = len-1 ;
00073     isWhiteSpace(str[last_non_white]) && (last_non_white != 0);
00074     --last_non_white
00075     );
00076   // Above, if only whitespace is found, last_non_white==0 on termination of
00077   // the loop!
00078   if( first_non_white > last_non_white )
00079     return std::string(""); // The std::string is all whitespace!
00080   return str.substr(first_non_white,last_non_white-first_non_white+1);
00081 }
00082 
00083 std::string Utils::toString(const int& x)
00084 {
00085   char s[100];
00086   std::sprintf(s, "%d", x);
00087   return std::string(s);
00088 }
00089 
00090 std::string Utils::toString(const unsigned int& x)
00091 {
00092   char s[100];
00093   std::sprintf(s, "%d", x);
00094   return std::string(s);
00095 }
00096 
00097 std::string Utils::toString(const double& x)
00098 {
00099   char s[100];
00100   std::sprintf(s, "%g", x);
00101   return std::string(s);
00102 }
00103 
00104 std::string Utils::getParallelExtension(
00105   int         procRank_in
00106   ,int        numProcs_in
00107   )
00108 {
00109 
00110   int        procRank = -1;
00111   int        numProcs = -1;
00112   if( numProcs_in > 0 ) {
00113     procRank = procRank_in;
00114     numProcs = numProcs_in;
00115   }
00116   else {
00117     procRank = Teuchos::GlobalMPISession::getRank();
00118     numProcs = Teuchos::GlobalMPISession::getNProc();
00119   }
00120 
00121   int maxProcOrder = 1;
00122   double tmp = numProcs;
00123   for( int i = 0; i < 10; ++i, tmp *= 0.1 ) {
00124     if(tmp >= 1.0)
00125       ++maxProcOrder;
00126     else
00127       break;
00128   }
00129 
00130   std::ostringstream parallelExtension;
00131   parallelExtension
00132     << std::setfill('0')
00133     << std::right << std::setw(maxProcOrder)
00134     << numProcs
00135     << "."
00136     << std::setfill('0')
00137     << std::right << std::setw(maxProcOrder)
00138     << procRank;
00139   return parallelExtension.str();
00140 }
00141 
00142 } // end namespace Teuchos
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