stx::BasicSymbolTable Class Reference

Class representing variables and functions placeholders within an expression. More...

#include <ExpressionParser.h>

Inheritance diagram for stx::BasicSymbolTable:

List of all members.

Public Types
typedef AnyScalar(*)	functionptr_type (const paramlist_type &paramlist)
	Signature of a function used in the symbol table.
Public Member Functions
	BasicSymbolTable ()
	Fills in the functionmap with the standard functions.
virtual	~BasicSymbolTable ()
	Required for virtual functions.
virtual AnyScalar	lookupVariable (const std::string &varname) const
	Return the (constant) value of a variable.
virtual AnyScalar	processFunction (const std::string &funcname, const paramlist_type &paramlist) const
	Called when a program-defined function needs to be evaluated within an expression.
void	setVariable (const std::string &varname, const AnyScalar &value)
	Add or replace a variable to the symbol table.
void	setFunction (const std::string &funcname, int arguments, functionptr_type funcptr)
	Add or replace a function to the symbol table.
void	clearVariables ()
	Clear variables table.
void	clearFunctions ()
	Clear function table.
void	addStandardFunctions ()
	Add set of standard mathematic functions.
Protected Types
typedef std::map< std::string, AnyScalar >	variablemap_type
	Container used to save a map of variable names.
typedef std::map< std::string, struct FunctionInfo >	functionmap_type
	Container used to save a map of function names.
Static Protected Member Functions
static AnyScalar	funcPI (const paramlist_type &paramlist)
	Return the value of PI as a double AnyScalar.
static AnyScalar	funcSIN (const paramlist_type &paramlist)
	Return the value of sin(x) as a double AnyScalar.
static AnyScalar	funcCOS (const paramlist_type &paramlist)
	Return the value of cos(x) as a double AnyScalar.
static AnyScalar	funcTAN (const paramlist_type &paramlist)
	Return the value of tan(x) as a double AnyScalar.
static AnyScalar	funcABS (const paramlist_type &paramlist)
	Return the value of abs(x) or fabs(f).
static AnyScalar	funcEXP (const paramlist_type &paramlist)
	Return the value of exp(x) as a double AnyScalar.
static AnyScalar	funcLOGN (const paramlist_type &paramlist)
	Return the value of log(x) as a double AnyScalar.
static AnyScalar	funcPOW (const paramlist_type &paramlist)
	Return the value of pow(x,y) as a double AnyScalar.
static AnyScalar	funcSQRT (const paramlist_type &paramlist)
	Return the value of sqrt(x) as a double AnyScalar.
Private Attributes
variablemap_type	variablemap
	Variable map which can be filled by the user-application.
functionmap_type	functionmap
	Function map used to lookup standard or user-added function.
Classes
struct	FunctionInfo
	Extra info about a function: the valid arguments. More...

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Detailed Description

Class representing variables and functions placeholders within an expression.

This base class contain two tables of variables and functions. Variables may be filled into the STL map by the program. The class also contains a set of basic mathematic functions.

Definition at line 163 of file ExpressionParser.h.

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Member Function Documentation

AnyScalar stx::BasicSymbolTable::lookupVariable

(

const std::string &

varname

)

const [virtual]

Return the (constant) value of a variable.

In this basic implementation no variables are defined, it always throws an UnknownSymbolException.

Implements stx::SymbolTable.

Definition at line 1532 of file ExpressionParser.cc.

References variablemap.

AnyScalar stx::BasicSymbolTable::processFunction	(	const std::string &	funcname,
		const paramlist_type &	paramlist
	)			const [virtual]

Called when a program-defined function needs to be evaluated within an expression.

Implements stx::SymbolTable.

Definition at line 1547 of file ExpressionParser.cc.

References functionmap.

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

• libstx-exparser/ExpressionParser.h
• libstx-exparser/ExpressionParser.cc

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