9b8e2dea78
This includes fixes for first, last, as_bytes and as_writable_bytes which were missing from the paper. * include/std/span (__cpp_lib_span): Update value. (span(It, size_type), span(It, End)): Make conditionally explicit. Add assertion. (span(R&&), span(const span<OType, OExtent>&)): Likewise and relax constraints. (span::first<Count>(), span::last<Count>()): Use explicit type in return statement. (as_bytes, as_writable_bytes): Likewise. * include/std/version (__cpp_lib_span): Update value. * testsuite/23_containers/span/1.cc: Check new value. * testsuite/23_containers/span/2.cc: Check new value. * testsuite/23_containers/span/explicit.cc: New test.
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// 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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// { dg-options "-std=gnu++2a" }
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// { dg-do compile { target c++2a } }
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#include <span>
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struct Range
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{
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int* begin();
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int* end();
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unsigned size() const;
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} r;
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auto first = std::begin(r), last = std::end(r);
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// span(It, size_type)
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std::span<int> s1 = {first, 2};
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std::span<int, 2> s2 = {first, 2}; // { dg-error "could not convert" }
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// span(It, End)
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std::span<int> s3 = {first, last};
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std::span<int, 2> s4 = {first, last}; // { dg-error "could not convert" }
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// span(R&&)
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std::span<int> s5 = r;
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std::span<int, 2> s6 = r; // { dg-error "conversion from" }
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// span(const span<OtherElement, OtherExtent>&)
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std::span<const int> s7 = s5;
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std::span<const int> s8 = s6;
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std::span<const int, 1> s9 = s5.first(1); // { dg-error "conversion from" }
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std::span<const int, 1> s10 = s7.first(1); // { dg-error "conversion from" }
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