HepTool::Evaluator Class Reference

#include <Evaluator.h>

Inheritance diagram for HepTool::Evaluator:

Public Types
enum	{   OK, WARNING_EXISTING_VARIABLE, WARNING_EXISTING_FUNCTION, WARNING_BLANK_STRING,   ERROR_NOT_A_NAME, ERROR_SYNTAX_ERROR, ERROR_UNPAIRED_PARENTHESIS, ERROR_UNEXPECTED_SYMBOL,   ERROR_UNKNOWN_VARIABLE, ERROR_UNKNOWN_FUNCTION, ERROR_EMPTY_PARAMETER, ERROR_CALCULATION_ERROR }

Public Member Functions
	Evaluator ()
	~Evaluator ()
double	evaluate (const char *expression)
int	status () const
int	error_position () const
void	print_error () const
std::string	error_name () const
void	setVariable (const char *name, double value)
void	setVariable (const char *name, const char *expression)
void	setFunction (const char *name, double(*fun)())
void	setFunction (const char *name, double(*fun)(double))
void	setFunction (const char *name, double(*fun)(double, double))
void	setFunction (const char *name, double(*fun)(double, double, double))
void	setFunction (const char *name, double(*fun)(double, double, double, double))
void	setFunction (const char *name, double(*fun)(double, double, double, double, double))
bool	findVariable (const char *name) const
bool	findFunction (const char *name, int npar) const
void	removeVariable (const char *name)
void	removeFunction (const char *name, int npar)
void	clear ()
void	setStdMath ()
void	setSystemOfUnits (double meter=1.0, double kilogram=1.0, double second=1.0, double ampere=1.0, double kelvin=1.0, double mole=1.0, double candela=1.0)

Detailed Description

Evaluator of arithmetic expressions with an extendable dictionary. Example:

*   #include "CLHEP/Evaluator/Evaluator.h"
*   HepTool::Evaluator eval;
*   eval.setStdMath();
*   double res = eval.evaluate("sin(30*degree)");
*   if (eval.status() != HepTool::Evaluator::OK) eval.print_error();
* 

Author

Evgeni Chernyaev Evgue.nosp@m.ni.T.nosp@m.chern.nosp@m.iaev.nosp@m.@cern.nosp@m..ch

Definition at line 26 of file Evaluator.h.

Member Enumeration Documentation

anonymous enum

List of possible statuses. Status of the last operation can be obtained with status(). In case if status() is an ERROR the corresponding error message can be printed with print_error().

See Also

status

error_position

print_error

Enumerator
OK	Everything OK
WARNING_EXISTING_VARIABLE	Redefinition of existing variable
WARNING_EXISTING_FUNCTION	Redefinition of existing function
WARNING_BLANK_STRING	Empty input string
ERROR_NOT_A_NAME	Not allowed sysmbol in the name of variable or function
ERROR_SYNTAX_ERROR	Systax error
ERROR_UNPAIRED_PARENTHESIS	Unpaired parenthesis
ERROR_UNEXPECTED_SYMBOL	Unexpected sysbol
ERROR_UNKNOWN_VARIABLE	Non-existing variable
ERROR_UNKNOWN_FUNCTION	Non-existing function
ERROR_EMPTY_PARAMETER	Function call has empty parameter
ERROR_CALCULATION_ERROR	Error during calculation

Definition at line 39 of file Evaluator.h.

       {
    OK,                         
    WARNING_EXISTING_VARIABLE,  
    WARNING_EXISTING_FUNCTION,  
    WARNING_BLANK_STRING,       
    ERROR_NOT_A_NAME,           
    ERROR_SYNTAX_ERROR,         
    ERROR_UNPAIRED_PARENTHESIS, 
    ERROR_UNEXPECTED_SYMBOL,    
    ERROR_UNKNOWN_VARIABLE,     
    ERROR_UNKNOWN_FUNCTION,     
    ERROR_EMPTY_PARAMETER,      
    ERROR_CALCULATION_ERROR     
  };

Constructor & Destructor Documentation

HepTool::Evaluator::Evaluator

(

)

Constructor.

Definition at line 596 of file Evaluator.cc.

                     {
  Struct * s = new Struct();
  p = (void *) s;
  s->theExpression = 0;
  s->thePosition   = 0;
  s->theStatus     = OK;
  s->theResult     = 0.0;
}

HepTool::Evaluator::~Evaluator

(

)

Destructor.

Definition at line 606 of file Evaluator.cc.

                      {
  delete (Struct *)(p);
}

Member Function Documentation

void HepTool::Evaluator::clear

(

)

Clear all settings.

Definition at line 762 of file Evaluator.cc.

                      {
  Struct * s = (Struct *) p;
  s->theDictionary.clear();
  s->theExpression = 0;
  s->thePosition   = 0;
  s->theStatus     = OK;
  s->theResult     = 0.0;
}

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std::string HepTool::Evaluator::error_name

(

)

const

get a string defining the error name

Definition at line 650 of file Evaluator.cc.

{
  char prefix[] = "Evaluator : ";
  std::ostringstream errn;
  Struct * s = (Struct *) p;
  switch (s->theStatus) {
  case ERROR_NOT_A_NAME:
    errn << prefix << "invalid name";
    break;
  case ERROR_SYNTAX_ERROR:
    errn << prefix << "syntax error";
    break;
  case ERROR_UNPAIRED_PARENTHESIS:
    errn << prefix << "unpaired parenthesis";
    break;
  case ERROR_UNEXPECTED_SYMBOL:
    errn << prefix << "unexpected symbol";
    break;
  case ERROR_UNKNOWN_VARIABLE:
    errn << prefix << "unknown variable";
    break;
  case ERROR_UNKNOWN_FUNCTION:
    errn << prefix << "unknown function";
    break;
  case ERROR_EMPTY_PARAMETER: 
    errn << prefix << "empty parameter in function call";
    break;
  case ERROR_CALCULATION_ERROR:
    errn << prefix << "calculation error";
    break;
  default:
    errn << " ";
  }
  return errn.str();
}

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int HepTool::Evaluator::error_position

(

)

const

Returns position in the input string where the problem occured.

Definition at line 636 of file Evaluator.cc.

                                    {
  return ((Struct *)(p))->thePosition - ((Struct *)(p))->theExpression;
}

double HepTool::Evaluator::evaluate

(

const char *

expression

)

Evaluates the arithmetic expression given as character string. The expression may consist of numbers, variables and functions separated by arithmetic (+, - , /, *, ^, **) and logical operators (==, !=, >, >=, <, <=, &&, ||).

Parameters

expression

input expression.

Returns

result of the evaluation.

See Also

status

error_position

print_error

Definition at line 611 of file Evaluator.cc.

                                                  {
  Struct * s = (Struct *)(p);
  if (s->theExpression != 0) { delete[] s->theExpression; }
  s->theExpression = 0;
  s->thePosition   = 0;
  s->theStatus     = WARNING_BLANK_STRING;
  s->theResult     = 0.0;
  if (expression != 0) {
    s->theExpression = new char[strlen(expression)+1];
    strcpy(s->theExpression, expression);
    s->theStatus = engine(s->theExpression,
              s->theExpression+strlen(expression)-1,
              s->theResult,
              s->thePosition,
              s->theDictionary);
  }
  return s->theResult;
}

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bool HepTool::Evaluator::findFunction	(	const char *	name,
		int	npar
	)		const

Finds the function in the dictionary.

Parameters

name	name of the function to be unset.
npar	number of parameters of the function.

Returns

true if such a function exists, false otherwise.

Definition at line 732 of file Evaluator.cc.

                                                              {
  if (name == 0 || *name == '\0')    return false;
  if (npar < 0  || npar > MAX_N_PAR) return false;
  const char * pointer; int n; REMOVE_BLANKS;
  if (n == 0) return false;
  Struct * s = (Struct *)(p);
  return ((s->theDictionary).find(sss[npar]+string(pointer,n)) ==
      (s->theDictionary).end()) ? false : true;
}

bool HepTool::Evaluator::findVariable

(

const char *

name

)

const

Finds the variable in the dictionary.

Parameters

name	name of the variable.

Returns

true if such a variable exists, false otherwise.

Definition at line 721 of file Evaluator.cc.

                                                    {
  if (name == 0 || *name == '\0') return false;
  const char * pointer; int n; REMOVE_BLANKS;
  if (n == 0) return false;
  Struct * s = (Struct *)(p);
  return
    ((s->theDictionary).find(string(pointer,n)) == (s->theDictionary).end()) ?
    false : true;
}

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void HepTool::Evaluator::print_error

(

)

const

Prints error message if status() is an ERROR.

Definition at line 641 of file Evaluator.cc.

                                  {
  Struct * s = (Struct *) p;
  if(s->theStatus != OK) {
      std::cerr << error_name() << std::endl;
  }
  return;
}

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void HepTool::Evaluator::removeFunction	(	const char *	name,
		int	npar
	)

Removes the function from the dictionary.

Parameters

name	name of the function to be unset.
npar	number of parameters of the function.

Definition at line 752 of file Evaluator.cc.

                                                          {
  if (name == 0 || *name == '\0')    return;
  if (npar < 0  || npar > MAX_N_PAR) return;
  const char * pointer; int n; REMOVE_BLANKS;
  if (n == 0) return;
  Struct * s = (Struct *)(p);
  (s->theDictionary).erase(sss[npar]+string(pointer,n));
}

void HepTool::Evaluator::removeVariable

(

const char *

name

)

Removes the variable from the dictionary.

Parameters

name	name of the variable.

Definition at line 743 of file Evaluator.cc.

                                                {
  if (name == 0 || *name == '\0') return;
  const char * pointer; int n; REMOVE_BLANKS;
  if (n == 0) return;
  Struct * s = (Struct *)(p);
  (s->theDictionary).erase(string(pointer,n));
}

void HepTool::Evaluator::setFunction	(	const char *	name,
		double(*)()	fun
	)

Adds to the dictionary a function without parameters. If such a function already exist in the dictionary, then status will be set to WARNING_EXISTING_FUNCTION.

Parameters

name	function name.
fun	pointer to the real function in the user code.

Definition at line 696 of file Evaluator.cc.

{ setItem("0", name, Item(reinterpret_cast<voidfuncptr>(fun)), (Struct *)p); }

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void HepTool::Evaluator::setFunction	(	const char *	name,
		double(*)(double)	fun
	)

Adds to the dictionary a function with one parameter. If such a function already exist in the dictionary, then status will be set to WARNING_EXISTING_FUNCTION.

Parameters

name	function name.
fun	pointer to the real function in the user code.

Definition at line 700 of file Evaluator.cc.

{ setItem("1", name, Item(reinterpret_cast<voidfuncptr>(fun)), (Struct *)p); }

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void HepTool::Evaluator::setFunction	(	const char *	name,
		double(*)(double, double)	fun
	)

Adds to the dictionary a function with two parameters. If such a function already exist in the dictionary, then status will be set to WARNING_EXISTING_FUNCTION.

Parameters

name	function name.
fun	pointer to the real function in the user code.

Definition at line 704 of file Evaluator.cc.

{ setItem("2", name, Item(reinterpret_cast<voidfuncptr>(fun)), (Struct *)p); }

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void HepTool::Evaluator::setFunction	(	const char *	name,
		double(*)(double, double, double)	fun
	)

Adds to the dictionary a function with three parameters. If such a function already exist in the dictionary, then status will be set to WARNING_EXISTING_FUNCTION.

Parameters

name	function name.
fun	pointer to the real function in the user code.

Definition at line 708 of file Evaluator.cc.

{ setItem("3", name, Item(reinterpret_cast<voidfuncptr>(fun)), (Struct *)p); }

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void HepTool::Evaluator::setFunction	(	const char *	name,
		double(*)(double, double, double, double)	fun
	)

Adds to the dictionary a function with four parameters. If such a function already exist in the dictionary, then status will be set to WARNING_EXISTING_FUNCTION.

Parameters

name	function name.
fun	pointer to the real function in the user code.

Definition at line 712 of file Evaluator.cc.

{ setItem("4", name, Item(reinterpret_cast<voidfuncptr>(fun)), (Struct *)p); }

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void HepTool::Evaluator::setFunction	(	const char *	name,
		double(*)(double, double, double, double, double)	fun
	)

Adds to the dictionary a function with five parameters. If such a function already exist in the dictionary, then status will be set to WARNING_EXISTING_FUNCTION.

Parameters

name	function name.
fun	pointer to the real function in the user code.

Definition at line 716 of file Evaluator.cc.

{ setItem("5", name, Item(reinterpret_cast<voidfuncptr>(fun)), (Struct *)p); }

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void HepTool::Evaluator::setStdMath

(

)

Sets standard mathematical functions and constants.

Definition at line 30 of file setStdMath.cc.

                           {

  //   S E T   S T A N D A R D   C O N S T A N T S

  setVariable("pi",     3.14159265358979323846);
  setVariable("e",      2.7182818284590452354);
  setVariable("gamma",  0.577215664901532861);
  setVariable("radian", 1.0);
  setVariable("rad",    1.0);
  setVariable("degree", 3.14159265358979323846/180.);
  setVariable("deg",    3.14159265358979323846/180.);

  //   S E T   S T A N D A R D   F U N C T I O N S

  setFunction("abs",   eval_abs);
  setFunction("min",   eval_min);
  setFunction("max",   eval_max);
  setFunction("sqrt",  eval_sqrt);
  setFunction("pow",   eval_pow);
  setFunction("sin",   eval_sin);
  setFunction("cos",   eval_cos);
  setFunction("tan",   eval_tan);
  setFunction("asin",  eval_asin);
  setFunction("acos",  eval_acos);
  setFunction("atan",  eval_atan);
  setFunction("atan2", eval_atan2);
  setFunction("sinh",  eval_sinh);
  setFunction("cosh",  eval_cosh);
  setFunction("tanh",  eval_tanh);
  setFunction("exp",   eval_exp);
  setFunction("log",   eval_log);
  setFunction("log10", eval_log10);
}

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void HepTool::Evaluator::setSystemOfUnits	(	double	meter = 1.0,
		double	kilogram = 1.0,
		double	second = 1.0,
		double	ampere = 1.0,
		double	kelvin = 1.0,
		double	mole = 1.0,
		double	candela = 1.0
	)

Sets system of units. Default is the SI system of units. To set the CGS (Centimeter-Gram-Second) system of units one should call: setSystemOfUnits(100., 1000., 1.0, 1.0, 1.0, 1.0, 1.0);

To set system of units accepted in the GEANT4 simulation toolkit one should call:

*   setSystemOfUnits(1.e+3, 1./1.60217733e-25, 1.e+9, 1./1.60217733e-10,
*                    1.0, 1.0, 1.0);
* 

The basic units in GEANT4 are:

*   millimeter              (millimeter = 1.)
*   nanosecond              (nanosecond = 1.)
*   Mega electron Volt      (MeV        = 1.)
*   positron charge         (eplus      = 1.)
*   degree Kelvin           (kelvin     = 1.)
*   the amount of substance (mole       = 1.)
*   luminous intensity      (candela    = 1.)
*   radian                  (radian     = 1.)
*   steradian               (steradian  = 1.)
* 

Definition at line 9 of file setSystemOfUnits.cc.

{               
  const double kilo_  = 1.e+03; // chilioi (Greek) "thousand"
  const double mega_  = 1.e+06; // megas (Greek) "large"
  const double giga_  = 1.e+09; // gigas (Greek) "giant"
  const double tera_  = 1.e+12; // teras (Greek) "monster"
  const double peta_  = 1.e+15; // pente (Greek) "five"

  const double deci_  = 1.e-01; // decimus (Latin) "tenth"
  const double centi_ = 1.e-02; // centum  (Latin) "hundred"
  const double milli_ = 1.e-03; // mille   (Latin) "thousand"
  const double micro_ = 1.e-06; // micro (Latin) or mikros (Greek) "small"
  const double nano_  = 1.e-09; // nanus (Latin) or nanos  (Greek) "dwarf"
  const double pico_  = 1.e-12; // pico (Spanish) "bit"

  // ======================================================================
  //
  // Base (default) SI units
  // for the basic measurable quantities (dimensions):
  //
  // ======================================================================
  
  // Length
  // metrum (Latin) and metron (Greek) "measure"
  const double m = meter;
  setVariable("meter", m);
  setVariable("metre", m);
  setVariable("m",     m);
  
  // Mass
  const double kg = kilogram;
  setVariable("kilogram", kg);
  setVariable("kg",       kg);
  
  // Time
  // minuta secundam (Latin) "second small one"
  const double s = second;
  setVariable("second", s);
  setVariable("s",      s);
  
  // Current
  // ---  honors Andre-Marie Ampere (1775-1836) of France
  const double A = ampere;
  setVariable("ampere", A);
  setVariable("amp",    A);
  setVariable("A",      A);
  
  // Temperature
  // ---  honors William Thomson, 1st Baron Lord Kelvin (1824-1907) of England
  const double K = kelvin;
  setVariable("kelvin", K);
  setVariable("K",      K);
  
  // Amount of substance
  const double mol = mole;
  setVariable("mole", mol);
  setVariable("mol",  mol);
  
  // Luminous intensity
  const double cd  = candela;
  setVariable("candela", cd);
  setVariable("cd",      cd);

  // ======================================================================
  //
  // Supplementary SI units having special symbols:
  //
  // ======================================================================

  // Plane angle 
  const double rad = 1.;
  setVariable("radian", rad);
  setVariable("rad",    rad);
  setVariable("milliradian", milli_ * rad);
  setVariable("mrad",        milli_ * rad);

  const double pi  = 3.14159265358979323846;
  const double deg = rad*pi/180.;
  setVariable("degree", deg);
  setVariable("deg",    deg);

  // Solid angle
  const double sr  = 1.;
  setVariable("steradian", sr);
  setVariable("sr",        sr);

  // ======================================================================
  //
  // Derived SI units having special symbols:
  //
  // ======================================================================

  // Frequency
  // ---  honors Heinrich Rudolf Hertz (1857-1894) of Germany
  const double Hz = 1./s;
  setVariable("hertz", Hz);
  setVariable("Hz",    Hz);

  // Force
  // ---  honors Sir Isaac Newton (1642-1727) of England
  const double N = m * kg / (s*s);
  setVariable("newton", N);
  setVariable("N",      N);

  // Pressure
  // ---  honors Blaise Pascal (1623-1662) of France
  const double Pa = N / (m*m);
  setVariable("pascal", Pa);
  setVariable("Pa",     Pa);

  const double atm = 101325. * Pa;
  setVariable("atmosphere", atm);
  setVariable("atm",        atm);

  const double bar = 100000*Pa;
  setVariable("bar", bar);

  // Energy
  // ---  honors James Prescott Joule (1818-1889) of England
  const double J = N * m;
  setVariable("joule", J);
  setVariable("J",     J);

  // Power
  // ---  honors James Watt (1736-1819) of Scotland
  const double W = J / s;
  setVariable("watt", W);
  setVariable("W",    W);

  // Electric charge
  // ---  honors Charles-Augustin de Coulomb (1736-1806) of France
  const double C = A * s;
  setVariable("coulomb", C);
  setVariable("C",       C);

  // Electric potential  
  // ---  honors Count Alessandro Volta (1745-1827) of Italy
  const double V = J / C;
  setVariable("volt", V);
  setVariable("V",    V);

  // Electric resistance
  // ---  honors Georg Simon Ohm (1787-1854) of Germany
  const double ohm = V / A;
  setVariable("ohm", ohm);

  // Electric conductance
  // ---  honors Ernst Werner von Siemens (1816-1892) or
  //      his brother Sir William (Karl Wilhelm von) Siemens (1823-1883)
  //      of Germany (England)
  const double S = 1./ ohm;
  setVariable("siemens", S);
  setVariable("S",       S);

  // Electric capacitance
  // ---  honors Michael Faraday (1791-1867) of England
  const double F = C / V;
  setVariable("farad", F);
  setVariable("F",     F);

  // Magnetic flux density
  // ---  honors Nikola Tesla (1856-1943) of Croatia (United States)
  const double T = V * s / (m*m);
  setVariable("tesla", T);
  setVariable("T",     T);

  // ---  honors Karl Friedrich Gauss (1777-1855) of Germany
  const double Gs = 1.e-4*T;
  setVariable("gauss", Gs);
  setVariable("Gs",    Gs);

  // Magnetic flux
  // ---  honors Wilhelm Eduard Weber (1804-1891) of Germany
  const double Wb = V * s;
  setVariable("weber", Wb);
  setVariable("Wb",    Wb);

  // Inductance
  // ---  honors Joseph Henry (1797-1878) of the United States
  const double H = Wb / A;
  setVariable("henry", H);
  setVariable("H",     H);

  // Luminous flux
  const double lm = cd * sr;
  setVariable("lumen", lm);
  setVariable("lm",    lm);

  // Illuminace
  const double lx = lm / (m*m);
  setVariable("lux", lx);
  setVariable("lx",  lx);

  // Radioactivity
  // ---  honors Antoine-Henri Becquerel (1852-1908) of France
  const double Bq = 1./s;
  setVariable("becquerel", Bq);
  setVariable("Bq",        Bq);
  setVariable("kilobecquerel",  kilo_ * Bq);
  setVariable("kBq",            kilo_ * Bq);
  setVariable("megabecquerel",  mega_ * Bq);
  setVariable("MBq",            mega_ * Bq);
  setVariable("gigabecquerel",  giga_ * Bq);
  setVariable("GBq",            giga_ * Bq);

  // ---  honors Pierre Curie (1859-1906) of France
  //      and Marie Sklodowska Curie (1867-1934) of Poland
  setVariable("curie", 3.7e+10 * Bq);
  setVariable("Ci",    3.7e+10 * Bq);
  setVariable("millicurie", milli_ * 3.7e+10 * Bq);
  setVariable("mCi",        milli_ * 3.7e+10 * Bq);
  setVariable("microcurie", micro_ * 3.7e+10 * Bq);
  setVariable("uCi",        micro_ * 3.7e+10 * Bq);

  // Specific energy
  // ---  honors Louis Harold Gray, F.R.S. (1905-1965) of England
  const double Gy = J / kg;
  setVariable("gray", Gy);
  setVariable("Gy",   Gy);
  setVariable("kilogray",   kilo_ * Gy);
  setVariable("milligray", milli_ * Gy);
  setVariable("microgray", micro_ * Gy);

  // Dose equivalent
  const double Sv = J / kg;
  setVariable("sievert", Sv);
  setVariable("Sv",      Sv);

  // ======================================================================
  //
  // Selected units:
  //
  // ======================================================================

  // Length

  const double mm = milli_ * m;
  setVariable("millimeter", mm);
  setVariable("mm",         mm);

  const double cm = centi_ * m;
  setVariable("centimeter", cm);
  setVariable("cm",         cm);

  setVariable("decimeter",  deci_ * m);

  const double km = kilo_ * m; 
  setVariable("kilometer",  km);
  setVariable("km",         km);

  setVariable("micrometer", micro_ * m);
  setVariable("micron",     micro_ * m);
  setVariable("nanometer",  nano_  * m);

  // ---  honors Anders Jonas Angstrom (1814-1874) of Sweden
  setVariable("angstrom",   1.e-10 * m);

  // ---  honors Enrico Fermi (1901-1954) of Italy
  setVariable("fermi",      1.e-15 * m);

  // Length^2

  setVariable("m2",  m*m);
  setVariable("mm2", mm*mm);
  setVariable("cm2", cm*cm);
  setVariable("km2", km*km);

  const double barn = 1.e-28 * m*m; 
  setVariable("barn",      barn);
  setVariable("millibarn", milli_ * barn);
  setVariable("mbarn",     milli_ * barn);
  setVariable("microbarn", micro_ * barn);
  setVariable("nanobarn",  nano_  * barn);
  setVariable("picobarn",  pico_  * barn);

  // LengthL^3

  setVariable("m3",  m*m*m);
  setVariable("mm3", mm*mm*mm);
  setVariable("cm3", cm*cm*cm);
  setVariable("cc",  cm*cm*cm);
  setVariable("km3", km*km*km);

  const double L = 1.e-3*m*m*m;
  setVariable("liter", L);  
  setVariable("litre", L);  
  setVariable("L",     L);  
  setVariable("centiliter",  centi_ * L);
  setVariable("cL",          centi_ * L);
  setVariable("milliliter",  milli_ * L);
  setVariable("mL",          milli_ * L);

  // Length^-1

  const double dpt = 1./m;
  setVariable("diopter", dpt);
  setVariable("dioptre", dpt);
  setVariable("dpt",     dpt);

  // Mass

  const double g = 0.001*kg;
  setVariable("gram", g);
  setVariable("g",    g);
  setVariable("milligram",   milli_ * g);
  setVariable("mg",          milli_ * g);
  
  // Time

  setVariable("millisecond", milli_ * s);
  setVariable("ms",          milli_ * s);
  setVariable("microsecond", micro_ * s);
  setVariable("us",          micro_ * s);
  setVariable("nanosecond",  nano_  * s);
  setVariable("ns",          nano_  * s);
  setVariable("picosecond",  pico_  * s);
  setVariable("ps",          pico_  * s);

  // Current

  setVariable("milliampere", milli_ * A);
  setVariable("mA",          milli_ * A);
  setVariable("microampere", micro_ * A);
  setVariable("nanoampere",  nano_  * A);

  // Frequency

  setVariable("kilohertz",   kilo_ * Hz);
  setVariable("kHz",         kilo_ * Hz);
  setVariable("megahertz",   mega_ * Hz);
  setVariable("MHz",         mega_ * Hz);

  // Force
  setVariable("kilonewton",  kilo_ * N);
  setVariable("kN",          kilo_ * N);

  // Pressure
  setVariable("kilobar",     kilo_ * bar);
  setVariable("kbar",        kilo_ * bar);
  setVariable("millibar",    milli_ * bar);
  setVariable("mbar",        milli_ * bar);

  // Energy
  setVariable("kilojoule",   kilo_ * J);
  setVariable("kJ",          kilo_ * J);
  setVariable("megajoule",   mega_ * J);
  setVariable("MJ",          mega_ * J);
  setVariable("gigajoule",   giga_ * J);
  setVariable("GJ",          giga_ * J);

  const double e_SI  = 1.60217733e-19;  // positron charge in coulomb
  const double ePlus = e_SI * C;        // positron charge
  const double eV    = ePlus * V;
  setVariable("electronvolt", eV);
  setVariable("eV",           eV);
  setVariable("kiloelectronvolt", kilo_ * eV);
  setVariable("keV",              kilo_ * eV);
  setVariable("megaelectronvolt", mega_ * eV);
  setVariable("MeV",              mega_ * eV);
  setVariable("gigaelectronvolt", giga_ * eV);
  setVariable("GeV",              giga_ * eV);
  setVariable("teraelectronvolt", tera_ * eV);
  setVariable("TeV",              tera_ * eV);
  setVariable("petaelectronvolt", peta_ * eV);
  setVariable("PeV",              peta_ * eV);

  // Power
  setVariable("kilowatt",    kilo_ * W);
  setVariable("kW",          kilo_ * W);
  setVariable("megawatt",    mega_ * W);
  setVariable("MW",          mega_ * W);
  setVariable("gigawatt",    giga_ * W);
  setVariable("GW",          giga_ * W);

  // Electric potential  
  setVariable("kilovolt",    kilo_ * V);
  setVariable("kV",          kilo_ * V);
  setVariable("megavolt",    mega_ * V);
  setVariable("MV",          mega_ * V);

  // Electric capacitance
  setVariable("millifarad",  milli_ * F);
  setVariable("mF",          milli_ * F);
  setVariable("microfarad",  micro_ * F);
  setVariable("uF",          micro_ * F);
  setVariable("nanofarad",   nano_  * F);
  setVariable("nF",          nano_  * F);
  setVariable("picofarad",   pico_  * F);
  setVariable("pF",          pico_  * F);

  // Magnetic flux density
  setVariable("kilogauss",   kilo_ * Gs);
  setVariable("kGs",         kilo_ * Gs);
}

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void HepTool::Evaluator::setVariable	(	const char *	name,
		double	value
	)

Adds to the dictionary a variable with given value. If a variable with such a name already exist in the dictionary, then status will be set to WARNING_EXISTING_VARIABLE.

Parameters

name	name of the variable.
value	value assigned to the variable.

Definition at line 687 of file Evaluator.cc.

{ setItem("", name, Item(value), (Struct *)p); }

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void HepTool::Evaluator::setVariable	(	const char *	name,
		const char *	expression
	)

Adds to the dictionary a variable with an arithmetic expression assigned to it. If a variable with such a name already exist in the dictionary, then status will be set to WARNING_EXISTING_VARIABLE.

Parameters

name	name of the variable.
expression	arithmetic expression.

Definition at line 690 of file Evaluator.cc.

{ setItem("", name, Item(expression), (Struct *)p); }

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int HepTool::Evaluator::status

(

)

const

Returns status of the last operation with the evaluator.

Definition at line 631 of file Evaluator.cc.

                            {
  return ((Struct *)(p))->theStatus;
}

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---

The documentation for this class was generated from the following files:

• geant4.10.03.p01/source/externals/clhep/include/CLHEP/Evaluator/Evaluator.h
• geant4.10.03.p01/source/externals/clhep/src/Evaluator.cc
• geant4.10.03.p01/source/externals/clhep/src/setStdMath.cc
• geant4.10.03.p01/source/externals/clhep/src/setSystemOfUnits.cc