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Enable compilation under C++20 with clang++ and its standard library #1248

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Feb 2, 2023
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Enable compilation under C++20 with clang++ and its standard library #1248

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2e6cc75
Permit C++20 compilation via clang and its standard C++ library
eddelbuettel Feb 2, 2023
5e7ca2a
Small correction
eddelbuettel Feb 2, 2023
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Permit C++20 compilation via clang and its standard C++ library
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@eddelbuettel
eddelbuettel committed Feb 2, 2023
commit 2e6cc75eb889856e0751af74b9266af834d323d6
5 changes: 5 additions & 0 deletions ChangeLog
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@@ -1,3 +1,8 @@
2023-02-02 Dirk Eddelbuettel <edd@debian.org>

* inst/include/Rcpp/sugar/functions/sapply.h: Enable compilation
under C++20 (using clang++ and its C++ library) via invoke_result

2023-01-29 Iñaki Ucar <iucar@fedoraproject.org>

* inst/tinytest/test_xptr.R: Fix a couple of tests writing to stdout
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13 changes: 9 additions & 4 deletions inst/include/Rcpp/sugar/functions/sapply.h
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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//

// sapply.h: Rcpp R/C++ interface class library -- sapply
//
// Copyright (C) 2010 - 2011 Dirk Eddelbuettel and Romain Francois
// Copyright (C) 2010 - 2023 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
Expand Down Expand Up @@ -33,7 +32,13 @@ template <typename Function, typename SugarExpression>
struct sapply_application_result_of
{
#if defined(RCPP_USING_CXX0X_OR_LATER)
typedef typename ::std::result_of<Function(typename SugarExpression::stored_type)>::type type;
#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<Function(typename SugarExpression::stored_type)>::type type;
#else
// since C++17, see https://en.cppreference.com/w/cpp/types/result_of
typedef typename ::std::invoke_result<Function(typename SugarExpression::stored_type)>::type type;
#endif
#else
typedef typename ::Rcpp::traits::result_of<Function>::type type;
#endif
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