#include <Evaluator.h>
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 } |
List of possible statuses. More... | |
Public Methods | |
Evaluator () | |
Constructor. | |
~Evaluator () | |
Destructor. | |
double | evaluate (const char *expression) |
Evaluates the arithmetic expression given as character string. More... | |
int | status () const |
Returns status of the last operation with the evaluator. | |
int | error_position () const |
Returns position in the input string where the problem occured. | |
void | print_error () const |
Prints error message if status() is an ERROR. | |
void | setVariable (const char *name, double value) |
Adds to the dictionary a variable with given value. More... | |
void | setVariable (const char *name, const char *expression) |
Adds to the dictionary a variable with an arithmetic expression assigned to it. More... | |
void | setFunction (const char *name, double(*fun)()) |
Adds to the dictionary a function without parameters. More... | |
void | setFunction (const char *name, double(*fun)(double)) |
Adds to the dictionary a function with one parameter. More... | |
void | setFunction (const char *name, double(*fun)(double, double)) |
Adds to the dictionary a function with two parameters. More... | |
void | setFunction (const char *name, double(*fun)(double, double, double)) |
Adds to the dictionary a function with three parameters. More... | |
void | setFunction (const char *name, double(*fun)(double, double, double, double)) |
Adds to the dictionary a function with four parameters. More... | |
void | setFunction (const char *name, double(*fun)(double, double, double, double, double)) |
Adds to the dictionary a function with five parameters. More... | |
bool | findVariable (const char *name) const |
Finds the variable in the dictionary. More... | |
bool | findFunction (const char *name, int npar) const |
Finds the function in the dictionary. More... | |
void | removeVariable (const char *name) |
Removes the variable from the dictionary. More... | |
void | removeFunction (const char *name, int npar) |
Removes the function from the dictionary. More... | |
void | clear () |
Clear all settings. | |
void | setStdMath () |
Sets standard mathematical functions and constants. | |
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) |
Sets system of units. More... |
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();
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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().
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Evaluates the arithmetic expression given as character string. The expression may consist of numbers, variables and functions separated by arithmetic (+, - , /, *, ^, **) and logical operators (==, !=, >, >=, <, <=, &&, ||).
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Finds the function in the dictionary.
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Finds the variable in the dictionary.
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Removes the function from the dictionary.
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Removes the variable from the dictionary.
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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.
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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.
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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.
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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.
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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.
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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.
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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.) |
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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.
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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.
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