lapply.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// lapply.h: Rcpp R/C++ interface class library -- lapply
//
// Copyright (C) 2010 - 2024 Dirk Eddelbuettel and Romain Francois
// Copyright (C) 2025        Dirk Eddelbuettel, Romain Francois and Iñaki Ucar
//
// 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__sugar__lapply_h
#define Rcpp__sugar__lapply_h
 
namespace Rcpp{
namespace sugar{
 
template <int RTYPE, bool NA, typename T, typename Function>
class Lapply : public VectorBase<
        VECSXP ,
        true ,
        Lapply<RTYPE,NA,T,Function>
> {
public:
        typedef Rcpp::VectorBase<RTYPE,NA,T> VEC ;
        typedef typename ::Rcpp::traits::result_of<Function, T>::type result_type ;
 
        Lapply( const VEC& vec_, Function fun_ ) :
                vec(vec_), fun(fun_){}
 
        inline SEXP operator[]( R_xlen_t i ) const {
                return Rcpp::wrap( fun( vec[i] ) );
        }
        inline R_xlen_t size() const { return vec.size() ; }
 
private:
        const VEC& vec ;
        Function fun ;
} ;
 
} // sugar
 
template <int RTYPE, bool NA, typename T, typename Function >
inline sugar::Lapply<RTYPE,NA,T,Function>
lapply( const Rcpp::VectorBase<RTYPE,NA,T>& t, Function fun ){
        return sugar::Lapply<RTYPE,NA,T,Function>( t, fun ) ;
}
 
} // Rcpp
 
#endif