class EvalFunction

Numerical expression parser.

Documentation

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

Public Methods

EvalFunction()

EvalFunction(istream & aist)

parse from input stream

virtual ~EvalFunction()

void Parse(istream & aist)

parse from stream

void DefineConstant(const char* name, double val)

define constant

double Eval(const double* x) const

evaluate function

void Eval(const double* x, double* y, int ydim) const

evaluate multi-value function

bool IsConstant() const

is expression a constant ?

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 AddOperation(EVAL_TOKEN op)

push operation.

void AddFunction(double (*fun) (double))

push functino call.

void Print(ostream & ost) const

print expression

Protected Fields

ARRAY<step> program

the evaluation sequence

istream* ist

parse from stream

EVAL_TOKEN token

double num_value

char string_value[1000]

char var_num

static SymbolTable<TFUNP> functions

registerd functions

SymbolTable<double> constants

registerd constants

Protected Methods

void ParseExpression()

parsing expression (standard parsing grammer)

void ParseTerm()

parsing expression (standard parsing grammer)

void ParsePrimary()

parsing expression (standard parsing grammer)

typedef double (*TFUNP)(double)

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

const char* GetStringValue() const

returns identifier of last token

void ReadNext()

read next token

Protected Members

class step

one step of evaluation

Private Members

enum EVAL_TOKEN

enum EVAL_TOKEN

EvalFunction()

EvalFunction(istream & aist)

parse from input stream

virtual ~EvalFunction()

void Parse(istream & aist)

parse from stream

void DefineConstant(const char* name, double val)

define constant

double Eval(const double* x) const

evaluate function

void Eval(const double* x, double* y, int ydim) const

evaluate multi-value function

bool IsConstant() const

is expression a constant ?

void AddConstant(double val)

push constant on stack. Used for external parser.

void AddVariable(int varnum)

push variable x[varnum-1]. Used for external parser.

void AddGlobVariable(const double* dp)

push pointer to global double value. Used for external parser.

void AddOperation(EVAL_TOKEN op)

push operation. Used for external parser.

void AddFunction(double (*fun) (double))

push functino call. Used for external parser.

void Print(ostream & ost) const

print expression

ARRAY<step> program

the evaluation sequence

void ParseExpression()

parsing expression (standard parsing grammer)

void ParseTerm()

parsing expression (standard parsing grammer)

void ParsePrimary()

parsing expression (standard parsing grammer)

istream* ist

parse from stream

EVAL_TOKEN token

double num_value

char string_value[1000]

char var_num

typedef double (*TFUNP)(double)

static SymbolTable<TFUNP> functions

registerd functions

SymbolTable<double> constants

registerd constants

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

const char* GetStringValue() const

returns identifier of last token

void ReadNext()

read next token

This class has no child classes.

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