walberla::math::FunctionParser Class Reference

Detailed Description

Function parser, for parsing and evaluating functions.

Can parse mathematical expressions containing the standard arithmetic operations(+,-,/,*) , brackets, functions (cos,sin,exp,sqrt) and variables

After parsing an expression, values can be bound to variables using a symbol table.

Example:

FunctionParser p;
p.parse("(t*t +5) + exp(Pi/2) * sin(cos(1)) ");
std::map<string,double> symbolTable;
symbolTable["Pi"]=3.141;
symbolTable["t"] = 24;
p.evaluate(symbolTable);

#include <Parser.h>

Public Member Functions
	FunctionParser ()
	~FunctionParser ()
void	parse (const std::string &equation)
double	evaluate (const std::map< std::string, double > &symbolTable) const
const bool &	isConstant () const
const bool &	isZero () const
bool	symbolExists (const std::string &symbol) const

Protected Member Functions
	FunctionParser (const FunctionParser &other)
FunctionParser &	operator= (const FunctionParser &other)

Protected Attributes
exprtk::expression< double > *	expression_ { nullptr }
exprtk::symbol_table< double > *	symbolTable_ { nullptr }
bool	isConstant_ {false}
bool	isZero_ {false}

Constructor & Destructor Documentation

FunctionParser() [1/2]

walberla::math::FunctionParser::FunctionParser ( )

default

~FunctionParser()

walberla::math::FunctionParser::~FunctionParser

(

)

FunctionParser() [2/2]

walberla::math::FunctionParser::FunctionParser ( const FunctionParser & other )

protected

Member Function Documentation

evaluate()

double walberla::math::FunctionParser::evaluate

(

const std::map< std::string, double > &

symbolTable

)

const

isConstant()

const bool & walberla::math::FunctionParser::isConstant ( ) const

inline

isZero()

const bool & walberla::math::FunctionParser::isZero ( ) const

inline

operator=()

FunctionParser & walberla::math::FunctionParser::operator= ( const FunctionParser & other )

protected

parse()

void walberla::math::FunctionParser::parse

(

const std::string &

equation

)

symbolExists()

bool walberla::math::FunctionParser::symbolExists

(

const std::string &

symbol

)

const

Member Data Documentation

expression_

exprtk::expression<double>* walberla::math::FunctionParser::expression_ { nullptr }

protected

isConstant_

bool walberla::math::FunctionParser::isConstant_ {false}

protected

isZero_

bool walberla::math::FunctionParser::isZero_ {false}

protected

symbolTable_

exprtk::symbol_table<double>* walberla::math::FunctionParser::symbolTable_ { nullptr }

protected

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

• /builds/administration/walberla-website/walberla/src/core/math/Parser.h
• /builds/administration/walberla-website/walberla/src/core/math/Parser.cpp