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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// DimNameProxy.h: Rcpp R/C++ interface class library -- dimension name proxy
//
// Copyright (C) 2010 - 2014 Dirk Eddelbuettel, Romain Francois and Kevin Ushey
//
// 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_vector_DimNameProxy_h
#define Rcpp_vector_DimNameProxy_h
namespace Rcpp{
namespace internal{
class DimNameProxy {
public:
DimNameProxy(SEXP data, int dim): data_(data), dim_(dim) {}
DimNameProxy(DimNameProxy const& other):
data_(other.data_), dim_(other.dim_) {}
inline DimNameProxy& assign(SEXP other) {
if (Rf_length(other) == 0)
{
Rf_setAttrib(data_, R_DimNamesSymbol, R_NilValue);
} else {
SEXP dims = Rf_getAttrib(data_, R_DimSymbol);
if (INTEGER(dims)[dim_] != Rf_length(other)) {
stop("dimension extent is '%d' while length of names is '%d'", INTEGER(dims)[dim_], Rf_length(other));
}
SEXP dimnames = Rf_getAttrib(data_, R_DimNamesSymbol);
if (Rf_isNull(dimnames)) {
Shield<SEXP> new_dimnames(Rf_allocVector(VECSXP, Rf_length(dims)));
SET_VECTOR_ELT(new_dimnames, dim_, other);
Rf_setAttrib(data_, R_DimNamesSymbol, new_dimnames);
} else {
SET_VECTOR_ELT(dimnames, dim_, other);
}
}
return *this;
}
inline DimNameProxy& operator=(SEXP other) {
return assign(other);
}
inline DimNameProxy& operator=(const DimNameProxy& other) {
return assign(SEXP(other));
}
inline operator SEXP() const {
SEXP dimnames = Rf_getAttrib(data_, R_DimNamesSymbol);
return Rf_isNull(dimnames) ? (R_NilValue) : (VECTOR_ELT(dimnames, dim_));
}
template <typename T>
inline operator T() const {
SEXP dimnames = Rf_getAttrib(data_, R_DimNamesSymbol);
if (Rf_isNull(dimnames)) {
return T();
} else {
return T(VECTOR_ELT(dimnames, dim_));
}
}
private:
SEXP data_;
int dim_;
};
}
}
#endif
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