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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// as.h: Rcpp R/C++ interface class library -- convert SEXP to C++ objects
//
// Copyright (C) 2009 - 2015 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__as__h
#define Rcpp__as__h
#include <Rcpp/internal/Exporter.h>
namespace Rcpp {
namespace internal {
template <typename T> T primitive_as(SEXP x) {
if (::Rf_length(x) != 1) {
const char* fmt = "Expecting a single value: [extent=%i].";
throw ::Rcpp::not_compatible(fmt, ::Rf_length(x));
}
const int RTYPE = ::Rcpp::traits::r_sexptype_traits<T>::rtype;
Shield<SEXP> y(r_cast<RTYPE>(x));
typedef typename ::Rcpp::traits::storage_type<RTYPE>::type STORAGE;
T res = caster<STORAGE,T>(*r_vector_start<RTYPE>(y));
return res;
}
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_primitive_tag) {
return primitive_as<T>(x);
}
inline const char* check_single_string(SEXP x) {
if (TYPEOF(x) == CHARSXP) return CHAR(x);
if (! ::Rf_isString(x) || Rf_length(x) != 1) {
const char* fmt = "Expecting a single string value: "
"[type=%s; extent=%i].";
throw ::Rcpp::not_compatible(fmt,
Rf_type2char(TYPEOF(x)),
Rf_length(x));
}
return CHAR(STRING_ELT(::Rcpp::r_cast<STRSXP>(x), 0));
}
template <typename T> T as_string(SEXP x, Rcpp::traits::true_type) {
const char* y = check_single_string(x);
return std::wstring(y, y+strlen(y));
}
template <typename T> T as_string(SEXP x, Rcpp::traits::false_type) {
return check_single_string(x);
}
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_string_tag) {
return as_string<T>(x, typename Rcpp::traits::is_wide_string<T>::type());
}
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_RcppString_tag) {
if (! ::Rf_isString(x)) {
const char* fmt = "Expecting a single string value: "
"[type=%s; extent=%i].";
throw ::Rcpp::not_compatible(fmt,
Rf_type2char(TYPEOF(x)),
Rf_length(x));
}
return STRING_ELT(::Rcpp::r_cast<STRSXP>(x), 0);
}
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_generic_tag) {
RCPP_DEBUG_1("as(SEXP = <%p>, r_type_generic_tag )", x);
::Rcpp::traits::Exporter<T> exporter(x);
RCPP_DEBUG_1("exporter type = %s", DEMANGLE(exporter));
return exporter.get();
}
void* as_module_object_internal(SEXP obj);
template <typename T> object<T> as_module_object(SEXP x) {
return (T*) as_module_object_internal(x);
}
/** handling object<T> */
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_module_object_const_pointer_tag) {
typedef typename Rcpp::traits::remove_const<T>::type T_NON_CONST;
return const_cast<T>((T_NON_CONST)as_module_object_internal(x));
}
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_module_object_pointer_tag) {
return as_module_object<typename traits::un_pointer<T>::type>(x);
}
/** handling T such that T is exposed by a module */
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_module_object_tag) {
T* obj = as_module_object<T>(x);
return *obj;
}
/** handling T such that T is a reference of a class handled by a module */
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_module_object_reference_tag) {
typedef typename traits::remove_reference<T>::type KLASS;
KLASS* obj = as_module_object<KLASS>(x);
return *obj;
}
/** handling T such that T is a reference of a class handled by a module */
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_module_object_const_reference_tag) {
typedef typename traits::remove_const_and_reference<T>::type KLASS;
KLASS* obj = as_module_object<KLASS>(x);
return const_cast<T>(*obj);
}
/** handling enums by converting to int first */
template <typename T> T as(SEXP x, ::Rcpp::traits::r_type_enum_tag) {
return T(primitive_as<int>(x));
}
}
/**
* Generic converted from SEXP to the typename. T can be any type that
* has a constructor taking a SEXP, which is the case for all our
* RObject and derived classes.
*
* If it is not possible to add the SEXP constructor, e.g you don't control
* the type, you can specialize the as template to perform the
* requested conversion
*
* This is used for example in Environment, so that for example the code
* below will work as long as there is a way to as<> the Foo type
*
* Environment x = ... ; // some environment
* Foo y = x["bla"] ; // if as<Foo> makes sense then this works !!
*/
template <typename T> T as(SEXP x) {
return internal::as<T>(x, typename traits::r_type_traits<T>::r_category());
}
template <> inline char as<char>(SEXP x) {
return internal::check_single_string(x)[0];
}
template <typename T>
inline typename traits::remove_const_and_reference<T>::type bare_as(SEXP x) {
return as< typename traits::remove_const_and_reference<T>::type >(x);
}
template<> inline SEXP as(SEXP x) { return x; }
} // Rcpp
#endif
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