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libstdc++: Add default_sentinel support to stream iterators
Missing pieces of P0896R4 "The One Ranges Proposal" for C++20. * include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)): Add constructor. (operator==(istream_iterator, default_sentinel_t)): Add operator. (ostream_iterator::difference_type): Define to ptrdiff_t for C++20. * include/bits/streambuf_iterator.h (istreambuf_iterator(default_sentinel_t)): Add constructor. (operator==(istreambuf_iterator, default_sentinel_t)): Add operator. * testsuite/24_iterators/istream_iterator/cons/sentinel.cc: New test. * testsuite/24_iterators/istream_iterator/sentinel.cc: New test. * testsuite/24_iterators/istreambuf_iterator/cons/sentinel.cc: New test. * testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.
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@ -1,5 +1,19 @@
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2020-02-24 Jonathan Wakely <jwakely@redhat.com>
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* include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
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Add constructor.
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(operator==(istream_iterator, default_sentinel_t)): Add operator.
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(ostream_iterator::difference_type): Define to ptrdiff_t for C++20.
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* include/bits/streambuf_iterator.h
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(istreambuf_iterator(default_sentinel_t)): Add constructor.
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(operator==(istreambuf_iterator, default_sentinel_t)): Add operator.
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* testsuite/24_iterators/istream_iterator/cons/sentinel.cc:
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New test.
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* testsuite/24_iterators/istream_iterator/sentinel.cc: New test.
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* testsuite/24_iterators/istreambuf_iterator/cons/sentinel.cc:
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New test.
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* testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.
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* include/std/ranges (__deep_const_range, __enable_view_impl): Remove.
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(ranges::enable_view): Simplify (LWG 3326).
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* include/bits/range_access.h (ranges::enable_view): Declare.
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@ -77,6 +77,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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_M_ok(__obj._M_ok)
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{ }
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#if __cplusplus > 201703L
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constexpr
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istream_iterator(default_sentinel_t) noexcept
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: istream_iterator() { }
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#endif
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#if __cplusplus >= 201103L
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istream_iterator& operator=(const istream_iterator&) = default;
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~istream_iterator() = default;
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@ -145,6 +151,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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friend bool
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operator!=(const istream_iterator& __x, const istream_iterator& __y)
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{ return !__x._M_equal(__y); }
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#if __cplusplus > 201703L
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friend bool
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operator==(const istream_iterator& __i, default_sentinel_t)
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{ return !__i._M_stream; }
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#endif
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};
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/**
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@ -166,6 +178,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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public:
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//@{
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/// Public typedef
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#if __cplusplus > 201703L
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using difference_type = ptrdiff_t;
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#endif
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef basic_ostream<_CharT, _Traits> ostream_type;
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@ -115,6 +115,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
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: _M_sbuf(0), _M_c(traits_type::eof()) { }
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#if __cplusplus > 201703L
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constexpr istreambuf_iterator(default_sentinel_t) noexcept
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: istreambuf_iterator() { }
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#endif
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#if __cplusplus >= 201103L
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istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
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@ -209,6 +214,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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const int_type __eof = traits_type::eof();
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return traits_type::eq_int_type(__c, __eof);
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}
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#if __cplusplus > 201703L
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friend bool
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operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
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{ return __i._M_at_eof(); }
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#endif
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};
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template<typename _CharT, typename _Traits>
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@ -0,0 +1,27 @@
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// { dg-options "-std=gnu++2a" }
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// { dg-do compile { target c++2a } }
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// Copyright (C) 2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <iterator>
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// C++20 doesn't require this to be non-throwing.
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static_assert( std::is_nothrow_constructible_v<std::istream_iterator<int>,
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std::default_sentinel_t> );
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constexpr std::istream_iterator<int> i = std::default_sentinel;
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@ -0,0 +1,57 @@
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// { dg-options "-std=gnu++2a" }
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// { dg-do run { target c++2a } }
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// Copyright (C) 2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <iterator>
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#include <sstream>
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#include <testsuite_hooks.h>
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void
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test01()
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{
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static_assert( std::sentinel_for<std::default_sentinel_t,
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std::istream_iterator<std::string>> );
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static_assert( std::sentinel_for<std::default_sentinel_t,
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std::istream_iterator<int>> );
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std::istream_iterator<int> i = std::default_sentinel;
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VERIFY( i == std::default_sentinel );
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VERIFY( std::default_sentinel == i );
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}
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void
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test02()
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{
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std::istringstream in("1 2 3");
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std::istream_iterator<int> iter(in);
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VERIFY( iter != std::default_sentinel );
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VERIFY( std::default_sentinel != iter );
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*iter++;
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*iter++;
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*iter++;
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VERIFY( iter == std::default_sentinel );
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VERIFY( std::default_sentinel == iter );
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}
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int main()
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{
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test01();
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test02();
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}
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@ -0,0 +1,26 @@
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// { dg-options "-std=gnu++2a" }
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// { dg-do compile { target c++2a } }
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// Copyright (C) 2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <iterator>
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static_assert( std::is_nothrow_constructible_v<std::istreambuf_iterator<char>,
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std::default_sentinel_t> );
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constexpr std::istreambuf_iterator<char> i = std::default_sentinel;
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