result_of.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
/* :tabSize=4:indentSize=4:noTabs=false:folding=explicit:collapseFolds=1: */
//
// result_of.h: Rcpp R/C++ interface class library -- traits to help wrap
//
// 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__traits__result_of__h
#define Rcpp__traits__result_of__h
 
namespace Rcpp{
namespace traits{
 
template <typename T, typename... Args>
struct result_of{
#if __cplusplus < 201703L
    // deprecated by C++17, removed by C++2020, see https://en.cppreference.com/w/cpp/types/result_of
    typedef typename ::std::result_of<T(typename Args::stored_type...)>::type type;
#else
    // since C++17, see https://en.cppreference.com/w/cpp/types/result_of
    typedef typename ::std::invoke_result<T, typename Args::stored_type...>::type type;
#endif
} ;
 
template <typename T>
struct result_of<T>{
    typedef typename T::result_type type ;
} ;
 
}
}
 
#endif