G4DimensionedTypeUtils.cc

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// John Allison  1st October 2012
 
// Utility moved from G4DimensionedType.hh.
 
#include "G4DimensionedType.hh"
 
namespace G4DimensionedTypeUtils
{
  // Helper class
  class HasName{
  public:
    HasName(const G4String& name): fName(name) {};
    bool operator()(const G4UnitDefinition* value) const
    {
      return ((value->GetName() == fName) || (value->GetSymbol() == fName));
    }
  private:
    G4String fName;
  };
  
  // Get unit value from input string. Return value indicates if
  // conversion was successful.
  G4bool GetUnitValue(const G4String& unit, G4double& value)
  {
    // Get units table
    G4UnitsTable& unitTable = G4UnitDefinition::GetUnitsTable();
    if (unitTable.empty()) G4UnitDefinition::BuildUnitsTable();
    
    // Iterate over unit lists, searching for unit match
    auto iterTable = unitTable.begin();
    
    HasName myUnit(unit);
    G4bool gotUnit(false);
    
    while (!gotUnit && (iterTable != unitTable.end())) {
      G4UnitsContainer unitContainer = (*iterTable)->GetUnitsList();
      
      auto iterUnits =
      std::find_if(unitContainer.begin(), unitContainer.end(), myUnit);
      
      if (iterUnits != unitContainer.end()) {
        value = (*iterUnits)->GetValue();
        gotUnit = true;
      }
      
      iterTable++;
    }
    
    return gotUnit;
  }
}