ngstd::EvalFunction Class Reference

Numerical expression parser. More...

#include <evalfunc.hpp>

Classes
struct	argtype
	the arguments passed to the function More...
class	ResultType
class	step
	one step of evaluation More...

Public Member Functions
	EvalFunction (istream &aist)
	parse from input stream
	EvalFunction (const string &str)
	parse from string
	EvalFunction (const EvalFunction &eval2)
bool	Parse (istream &aist)
	parse from stream
void	DefineConstant (const string &name, double val)
	define constant
void	DefineGlobalVariable (const string &name, double *var)
	define constant
void	DefineGlobalVariable (const string &name, GenericVariable *var)
	define constant
void	DefineArgument (const string &name, int num, int vecdim=1, bool iscomplex=false)
	define arguments
double	Eval (const double *x=NULL) const
	evaluate function
void	Eval (const double *x, double *y, int ydim) const
	evaluate multi-value function
complex< double >	Eval (const complex< double > *x=NULL) const
	evaluate function
void	Eval (const complex< double > *x, complex< double > *y, int ydim) const
	evaluate multi-value complex function
void	Eval (const complex< double > *x, double *y, int ydim) const
	evaluate multi-value complex function with real result
template<typename TIN, typename TCALC>
void	Eval (const TIN *x, TCALC *stack) const
bool	IsComplex () const
	is expression complex valued ?
bool	IsResultComplex () const
	is expression complex valued ?
bool	IsConstant () const
	is expression a constant ?
double	EvalConstant () const
	evaluate the constant value
int	Dimension () const
	vector dimension of result
void	AddConstant (double val)
	push constant on stack.
void	AddVariable (int varnum)
	push variable x[varnum-1].
void	AddGlobVariable (const double *dp)
	push pointer to global double value.
void	AddGlobVariable (const GenericVariable *dp)
	push pointer to global double value.
void	AddOperation (EVAL_TOKEN op)
	push operation.
void	AddFunction (double(*fun)(double))
	push function call.
void	Print (ostream &ost) const
	print expression
EVAL_TOKEN	GetToken () const
	returns last token
double	GetNumValue () const
	returns num_value of last token
int	GetVariableNumber () const
	returns variable number of last token
int	GetVariableDimension () const
	returns dimension of variable of last token
bool	GetVariableIsComplex () const
const char *	GetStringValue () const
	returns identifier of last token
void	ReadNext (bool optional=true)
	read next token
void	WriteBack ()
bool	ToBool (double x) const
bool	ToBool (complex< double > x) const
double	CheckReal (double x) const
double	CheckReal (complex< double > x) const
double	Abs (double x) const
double	Abs (complex< double > x) const

Public Attributes
SymbolTable< argtype >	arguments
int	num_arguments

Protected Types
typedef double(*	TFUNP) (double)

Protected Member Functions
ResultType	ParseExpression ()
	parsing expression (standard parsing grammar)
ResultType	ParseCommaExpression ()
	parsing expression (standard parsing grammar)
ResultType	ParseSubExpression ()
	parsing expression (standard parsing grammar)
ResultType	ParseTerm ()
	parsing expression (standard parsing grammar)
ResultType	ParsePrimary ()
	parsing expression (standard parsing grammar)

Protected Attributes
Array< step >	program
	the evaluation sequence
ResultType	res_type
const double	eps
istream *	ist
	parse from stream
EVAL_TOKEN	token
double	num_value
char	string_value [1000]
int	var_num
int	var_dim
bool	var_iscomplex
double *	globvar
GenericVariable *	globgenvar
streampos	lastpos
SymbolTable< double >	constants
	registered constants
SymbolTable< double * >	globvariables
	registered variables
SymbolTable< GenericVariable * >	genericvariables
	registered variables

Static Protected Attributes
static SymbolTable< TFUNP >	functions
	registered functions

Detailed Description

Numerical expression parser.

The expression is stored in reverse Polnish notation. The evaluation tree can be filled form an external parser, see Addxxx methods.

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

• ngstd/evalfunc.hpp