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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// InputParameter.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 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__InputParameter__h
#define Rcpp__InputParameter__h
namespace Rcpp {
// default implementation used for pass by value and modules objects
// as<> is called on the conversion operator
template <typename T>
class InputParameter {
public:
InputParameter(SEXP x_) : x(x_){}
inline operator T() { return as<T>(x) ; }
private:
SEXP x ;
} ;
// impl for references. It holds an object at the constructor and then
// returns a reference in the reference operator
template <typename T>
class ReferenceInputParameter {
public:
typedef T& reference ;
ReferenceInputParameter(SEXP x_) : obj( as<T>(x_) ){}
inline operator reference() { return obj ; }
private:
T obj ;
} ;
// same for const
template <typename T>
class ConstInputParameter {
public:
typedef const T const_nonref ;
ConstInputParameter(SEXP x_) : obj( as<T>(x_) ){}
inline operator const_nonref() { return obj ; }
private:
T obj ;
} ;
// same for const references
template <typename T>
class ConstReferenceInputParameter {
public:
typedef const T& const_reference ;
ConstReferenceInputParameter(SEXP x_) : obj( as<T>(x_) ){}
inline operator const_reference() { return obj ; }
private:
T obj ;
} ;
namespace traits{
template <typename T>
struct input_parameter {
typedef typename Rcpp::InputParameter<T> type ;
} ;
template <typename T>
struct input_parameter<T&> {
typedef typename Rcpp::ReferenceInputParameter<T> type ;
} ;
template <typename T>
struct input_parameter<const T> {
typedef typename Rcpp::ConstInputParameter<T> type ;
} ;
template <typename T>
struct input_parameter<const T&> {
typedef typename Rcpp::ConstReferenceInputParameter<T> type ;
} ;
}
}
#endif
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