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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Function.h: Rcpp R/C++ interface class library -- functions (also primitives and builtins)
//
// Copyright (C) 2010 - 2013 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp_Function_h
#define Rcpp_Function_h
#include <RcppCommon.h>
#include <Rcpp/grow.h>
namespace Rcpp{
/**
* functions
*/
RCPP_API_CLASS(Function_Impl) {
public:
RCPP_GENERATE_CTOR_ASSIGN(Function_Impl)
Function_Impl(SEXP x){
switch( TYPEOF(x) ){
case CLOSXP:
case SPECIALSXP:
case BUILTINSXP:
Storage::set__(x);
break;
default:
const char* fmt = "Cannot convert object to a function: "
"[type=%s; target=CLOSXP, SPECIALSXP, or "
"BUILTINSXP].";
throw not_compatible(fmt, Rf_type2char(TYPEOF(x)));
}
}
/**
* Finds a function. By default, searches from the global environment
*
* @param name name of the function
* @param env an environment where to search the function
* @param ns name of the namespace in which to search the function
*/
Function_Impl(const std::string& name) {
get_function(name, R_GlobalEnv);
}
Function_Impl(const std::string& name, const SEXP env) {
if (!Rf_isEnvironment(env)) {
stop("env is not an environment");
}
get_function(name, env);
}
Function_Impl(const std::string& name, const std::string& ns) {
Shield<SEXP> env(Rf_findVarInFrame(R_NamespaceRegistry, Rf_install(ns.c_str())));
if (env == R_UnboundValue) {
stop("there is no namespace called \"%s\"", ns);
}
get_function(name, env);
}
SEXP operator()() const {
Shield<SEXP> call(Rf_lang1(Storage::get__()));
return Rcpp_fast_eval(call, R_GlobalEnv);
}
template <typename... T>
SEXP operator()(const T&... args) const {
return invoke(pairlist(args...), R_GlobalEnv);
}
/**
* Returns the environment of this function
*/
SEXP environment() const {
SEXP fun = Storage::get__() ;
if( TYPEOF(fun) != CLOSXP ) {
throw not_a_closure(Rf_type2char(TYPEOF(fun)));
}
#if (defined(R_VERSION) && R_VERSION >= R_Version(4,5,0))
return R_ClosureEnv(fun);
#else
return CLOENV(fun);
#endif
}
/**
* Returns the body of the function
*/
SEXP body() const {
return BODY( Storage::get__() ) ;
}
void update(SEXP){}
private:
void get_function(const std::string& name, const SEXP env) {
SEXP nameSym = Rf_install( name.c_str() ); // cannot be gc()'ed once in symbol table
Shield<SEXP> x( Rf_findFun( nameSym, env ) ) ;
Storage::set__(x) ;
}
SEXP invoke(SEXP args_, SEXP env) const {
Shield<SEXP> args(args_);
Shield<SEXP> call(Rcpp_lcons(Storage::get__(), args));
SEXP out = Rcpp_fast_eval(call, env);
return out;
}
};
typedef Function_Impl<PreserveStorage> Function ;
} // namespace Rcpp
#endif
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