Evaluator.h File Reference

($Id: Evaluator.h 1348 2013-02-25 17:49:03Z arr $)

Class CXXR::Evaluator. More...

#include "R_ext/Boolean.h"
#include "CXXR/Environment.h"
#include "CXXR/PairList.h"
#include <utility>

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Classes
class	CXXR::Evaluator
	Framework for R command evaluation. More...

Namespaces
namespace	CXXR
	Namespace for the CXXR project.

Functions
int	R_isMissing (SEXP symbol, SEXP rho)
	Is a Symbol missing within an Environment?
RObject *	CXXR::evaluate (RObject *object, Environment *env)
	Shorthand for Evaluator::evaluate().
SEXP	Rf_eval (SEXP e, SEXP rho)
	Evaluate an object in a specified Environment.

Variables
Rboolean	R_Visible
	Print expression value?
int	R_interrupts_pending
	Are any user interrupts currently pending?
Rboolean	R_interrupts_suspended
	Are interrupts currently suspended?

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Detailed Description

Class CXXR::Evaluator.

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Function Documentation

int R_isMissing	(	SEXP	symbol,
		SEXP	rho
	)

Is a Symbol missing within an Environment?

Parameters:

symbol	Pointer to the Symbol whose missing status is required.
rho	Pointer to the Environment in whose Frame symbol is to be sought.

Returns:

A non-zero value iff symbol is missing in the Frame of rho.

Note:

For more information, refer to the code, which is surprisingly complicated.

SEXP Rf_eval ( SEXP  e, SEXP  rho  )

inline

Evaluate an object in a specified Environment.

Parameters:

e	Pointer (possibly null) to the object to be evaluated.
rho	Pointer to an Environment (checked unless e is null).

Returns:

Pointer to the result of evaluating e in rho, or a null pointer if e is null.

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Variable Documentation

int R_interrupts_pending

Are any user interrupts currently pending?

If user interrupts are attempted while user interrupts are suspended, this is set non-zero. The interrupt is then services when the period of suspension ends.

Rboolean R_Visible

Print expression value?

If R_Visible is TRUE when the evaluation of a top-level R expression completes, the value of the expression is printed.

Note:

In CXXR, R_Visible is evolving towards becoming a static data member of class CXXR::Evaluator.