133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
// Copyright (C) 2008-2022 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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// { dg-do run { target c++11 } }
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#include <sstream>
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#include <string>
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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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int i = 1742;
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std::ostringstream() << i;
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std::string result ("1742");
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int i2;
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std::istringstream(result) >> i2;
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VERIFY (i == i2);
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}
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struct X { bool as_rvalue; };
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void operator>>(std::istream&, X& x) { x.as_rvalue = false; }
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void operator>>(std::istream&, X&& x) { x.as_rvalue = true; }
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// LWG 2328 Rvalue stream extraction should use perfect forwarding
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void
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test02()
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{
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X x;
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std::istringstream is;
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auto&& ref1 = (std::move(is) >> x);
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VERIFY( &ref1 == &is );
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VERIFY( x.as_rvalue == false );
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auto&& ref2 = (std::move(is) >> std::move(x));
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VERIFY( &ref2 == &is );
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VERIFY( x.as_rvalue == true );
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char arr[2];
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#if __cplusplus <= 201703L
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std::istringstream("x") >> &arr[0];
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#endif
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std::istringstream("x") >> arr;
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VERIFY( std::string(arr) == "x" );
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}
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// LWG 1203 More useful rvalue stream insertion
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void
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test03()
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{
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int i = 1203;
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std::string result = (std::ostringstream() << "i = " << i).str();
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VERIFY( result == "i = 1203" );
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std::ostringstream os;
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std::ostringstream&& ros = std::move(os) << result;
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VERIFY( &ros == &os );
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VERIFY( ros.str() == result );
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std::stringstream ss;
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std::stringstream&& rss = std::move(ss) << result;
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VERIFY( &rss == &ss );
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VERIFY( rss.str() == result );
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std::istringstream is("first second third");
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std::istringstream&& ris = std::move(is) >> result;
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VERIFY( &ris == &is );
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VERIFY( result == "first" );
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std::stringstream ss2("fourth fifth sixth");
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std::stringstream&& rss2 = std::move(ss2) >> result;
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VERIFY( &rss2 == &ss2 );
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VERIFY( result == "fourth" );
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}
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struct A { friend void operator<<(std::ios_base&, A) { } };
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struct O : private std::ios_base { friend void operator<<(O&, int) { } };
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template<typename Ostream, typename T, typename = void>
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struct is_insertable
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: std::false_type
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{ };
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template<typename> using void_t = void;
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template<typename Ostream, typename T>
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using insert_result
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= decltype(std::declval<Ostream>() << std::declval<const T&>());
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template<typename Ostream, typename T>
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struct is_insertable<Ostream, T, void_t<insert_result<Ostream, T>>>
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: std::true_type
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{ };
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// LWG 1203 negative tests
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void
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test04()
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{
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static_assert( is_insertable<std::ios_base&, A>::value,
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"valid using the friend operator<<" );
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static_assert( !is_insertable<std::ios_base&&, A>::value,
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"ill-formed because ios_base is not derived from ios_base" );
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static_assert( is_insertable<O&, int>::value,
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"valid using the friend operator<<" );
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static_assert( !is_insertable<O&&, int>::value,
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"ill-formed because O is not publicly derived from ios_base" );
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}
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int
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main()
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{
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test01();
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test02();
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test03();
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test04();
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}
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