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Improve precondition checks for std::span 

* doc/xml/manual/status_cxx2020.xml: Update status for P0122R7 and
	P1024R3. Remove entry for P0920R2.
	* include/std/span  (__cpp_lib_span): Change value.
	(__extent_storage, __extent_storage<dynamic_extent>): Remove default
	constructor.
	(span): Replace __extent_storage base class with data member.
	(span::_S_subspan_extent): New function.
	(span::empty()): Add nodiscard attribute.
	(span::front, span::back, span::operator[]): Check preconditions.
	(span::first, span::last, span::subspan): Add noexcept. Improve
	precondition checks (LWG 3103).
	(get): Remove redundant condition from static_assert.
	(tuple_element<I, span<T, E>>): Fix static_assert message and simplify.
	(as_writable_bytes): Add inline specifier.
	* include/std/version (__cpp_lib_span): Change value.
	* testsuite/23_containers/span/back_neg.cc: Remove stray semi-colon.
	* testsuite/23_containers/span/front_neg.cc: Likewise.
	* testsuite/23_containers/span/index_op_neg.cc: Likewise.
	* testsuite/23_containers/span/last_neg.cc: Improve test.
	* testsuite/23_containers/span/subspan_neg.cc: Likewise.
	* testsuite/23_containers/span/1.cc: New test.
	* testsuite/23_containers/span/2.cc: New test.
	* testsuite/23_containers/span/back_assert_neg.cc: New test.
	* testsuite/23_containers/span/first_2_assert_neg.cc: New test.
	* testsuite/23_containers/span/first_assert_neg.cc: New test.
	* testsuite/23_containers/span/first_neg.cc: New test.
	* testsuite/23_containers/span/front_assert_neg.cc: New test.
	* testsuite/23_containers/span/index_op_assert_neg.cc: New test.
	* testsuite/23_containers/span/last_2_assert_neg.cc: New test.
	* testsuite/23_containers/span/last_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_2_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_3_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_4_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_5_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_6_assert_neg.cc: New test.
	* testsuite/23_containers/span/subspan_assert_neg.cc: New test.

From-SVN: r275411
This commit is contained in:
Jonathan Wakely 2019-09-05 14:48:33 +01:00 committed by Jonathan Wakely
parent 55e8f926f2
commit b5c433ce11
26 changed files with 733 additions and 123 deletions
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39
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,42 @@
2019-09-05 Jonathan Wakely <jwakely@redhat.com>
* doc/xml/manual/status_cxx2020.xml: Update status for P0122R7 and
P1024R3. Remove entry for P0920R2.
* include/std/span (__cpp_lib_span): Change value.
(__extent_storage, __extent_storage<dynamic_extent>): Remove default
constructor.
(span): Replace __extent_storage base class with data member.
(span::_S_subspan_extent): New function.
(span::empty()): Add nodiscard attribute.
(span::front, span::back, span::operator[]): Check preconditions.
(span::first, span::last, span::subspan): Add noexcept. Improve
precondition checks (LWG 3103).
(get): Remove redundant condition from static_assert.
(tuple_element<I, span<T, E>>): Fix static_assert message and simplify.
(as_writable_bytes): Add inline specifier.
* include/std/version (__cpp_lib_span): Change value.
* testsuite/23_containers/span/back_neg.cc: Remove stray semi-colon.
* testsuite/23_containers/span/front_neg.cc: Likewise.
* testsuite/23_containers/span/index_op_neg.cc: Likewise.
* testsuite/23_containers/span/last_neg.cc: Improve test.
* testsuite/23_containers/span/subspan_neg.cc: Likewise.
* testsuite/23_containers/span/1.cc: New test.
* testsuite/23_containers/span/2.cc: New test.
* testsuite/23_containers/span/back_assert_neg.cc: New test.
* testsuite/23_containers/span/first_2_assert_neg.cc: New test.
* testsuite/23_containers/span/first_assert_neg.cc: New test.
* testsuite/23_containers/span/first_neg.cc: New test.
* testsuite/23_containers/span/front_assert_neg.cc: New test.
* testsuite/23_containers/span/index_op_assert_neg.cc: New test.
* testsuite/23_containers/span/last_2_assert_neg.cc: New test.
* testsuite/23_containers/span/last_assert_neg.cc: New test.
* testsuite/23_containers/span/subspan_2_assert_neg.cc: New test.
* testsuite/23_containers/span/subspan_3_assert_neg.cc: New test.
* testsuite/23_containers/span/subspan_4_assert_neg.cc: New test.
* testsuite/23_containers/span/subspan_5_assert_neg.cc: New test.
* testsuite/23_containers/span/subspan_6_assert_neg.cc: New test.
* testsuite/23_containers/span/subspan_assert_neg.cc: New test.
2019-09-05 JeanHeyd Meneide <phdofthehouse@gmail.com>
* include/Makefile.am: Add <span> header.

12
libstdc++-v3/doc/html/manual/status.html
View File

@ -1109,11 +1109,11 @@ Feature-testing recommendations for C++</a>.
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0777r1.pdf" target="_top">
P0777R1
</a>
</td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code">&lt;span&gt;</code> </td><td align="left">
</td><td align="center"> 9.1 </td><td align="left"> </td></tr><tr><td align="left"> <code class="code">&lt;span&gt;</code> </td><td align="left">
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0122r7.pdf" target="_top">
P0122R7
</a>
</td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Extending chrono to Calendars and Time Zones </td><td align="left">
</td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span &gt;= 201803L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Extending chrono to Calendars and Time Zones </td><td align="left">
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r7.html" target="_top">
P0355R7
</a>
@ -1430,17 +1430,13 @@ Feature-testing recommendations for C++</a>.
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1252r2.pdf" target="_top">
P1252R2
</a>
</td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left">
</td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left">
Usability Enhancements for <code class="classname">std::span</code>
</td><td align="left">
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1024r3.pdf" target="_top">
P1024R3
</a>
</td><td align="center"> </td><td align="left"> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Precalculated hash values in lookup </td><td align="left">
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0920r2.html" target="_top">
P0920R2
</a>
</td><td align="center"> </td><td align="left"> </td></tr><tr><td align="left"> Traits for [Un]bounded Arrays </td><td align="left">
</td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span &gt;= 201902L</code> </td></tr><tr><td align="left"> Traits for [Un]bounded Arrays </td><td align="left">
<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1357r1.pdf" target="_top">
P1357R1
</a>

22
libstdc++-v3/doc/xml/manual/status_cxx2020.xml
View File

@ -237,15 +237,14 @@ Feature-testing recommendations for C++</link>.
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry> <code>&lt;span&gt;</code> </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0122r7.pdf">
P0122R7
</link>
</entry>
<entry align="center"> </entry>
<entry />
<entry align="center"> 10.1 </entry>
<entry> <code>__cpp_lib_span &gt;= 201803L</code> </entry>
</row>
<row>
@ -1111,7 +1110,6 @@ Feature-testing recommendations for C++</link>.
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry>
Usability Enhancements for <classname>std::span</classname>
</entry>
@ -1120,20 +1118,8 @@ Feature-testing recommendations for C++</link>.
P1024R3
</link>
</entry>
<entry align="center"> </entry>
<entry />
</row>
<row>
<?dbhtml bgcolor="#C8B0B0" ?>
<entry> Precalculated hash values in lookup </entry>
<entry>
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0920r2.html">
P0920R2
</link>
</entry>
<entry align="center"> </entry>
<entry />
<entry align="center"> 10.1 </entry>
<entry> <code>__cpp_lib_span &gt;= 201902L</code> </entry>
</row>
<row>

195
libstdc++-v3/include/std/span
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@ -49,9 +49,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// FIXME: they forgot this feature test macro
// get on someone's back about it in Belfast!!!
#define __cpp_lib_span 201911
#define __cpp_lib_span 201902L
inline constexpr size_t dynamic_extent = static_cast<size_t>(-1);
@ -78,9 +76,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
class __extent_storage
{
public:
constexpr
__extent_storage() noexcept = default;
constexpr
__extent_storage(size_t) noexcept
{ }
@ -91,13 +86,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
};
template<>
class __extent_storage<static_cast<size_t>(-1)>
class __extent_storage<dynamic_extent>
{
public:
constexpr
__extent_storage() noexcept : _M_extent_value(0)
{ };
constexpr
__extent_storage(size_t __extent) noexcept
: _M_extent_value(__extent)
@ -114,8 +105,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
} // namespace __detail
template<typename _Type, size_t _Extent = dynamic_extent>
class span : private __detail::__extent_storage<_Extent>
class span
{
template<size_t _Offset, size_t _Count>
static constexpr size_t
_S_subspan_extent()
{
if constexpr (_Count != dynamic_extent)
return _Count;
else if constexpr (extent != dynamic_extent)
return _Extent - _Offset;
else
return dynamic_extent;
}
public:
// member types
using value_type = remove_cv_t<_Type>;
@ -138,17 +141,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// member constants
static inline constexpr size_t extent = _Extent;
private:
using __base_t = __detail::__extent_storage<extent>;
public:
// constructors
template <typename _Dummy = _Type,
enable_if_t<is_same_v<_Dummy, _Type>
&& (_Extent == dynamic_extent || _Extent == 0)>* = nullptr>
constexpr
span() noexcept : __base_t(0), _M_ptr(nullptr)
span() noexcept : _M_extent(0), _M_ptr(nullptr)
{ }
constexpr
@ -234,7 +233,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr
span(_ContiguousIterator __first, index_type __count)
noexcept(noexcept(::std::__adl_to_address(__first)))
: __base_t(__count), _M_ptr(::std::__adl_to_address(__first))
: _M_extent(__count), _M_ptr(::std::__adl_to_address(__first))
{ __glibcxx_assert(_Extent == dynamic_extent || __count == _Extent); }
#else
@ -276,7 +275,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr
span(pointer __first, index_type __count) noexcept
: __base_t(__count), _M_ptr(static_cast<pointer>(__first))
: _M_extent(__count), _M_ptr(static_cast<pointer>(__first))
{ __glibcxx_assert(_Extent == dynamic_extent || __count == _Extent); }
constexpr
@ -290,41 +289,52 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr span&
operator=(const span&) noexcept = default;
// observers: element access
// observers
constexpr index_type
size() const noexcept
{ return this->_M_extent._M_extent(); }
constexpr index_type
size_bytes() const noexcept
{ return this->_M_extent._M_extent() * sizeof(element_type); }
[[nodiscard]] constexpr bool
empty() const noexcept
{ return size() == 0; }
// element access
constexpr reference
front() const noexcept
{ return *this->begin(); }
{
static_assert(extent != 0);
__glibcxx_assert(!empty());
return *this->_M_ptr;
}
constexpr reference
back() const noexcept
{
iterator __it = this->end();
--__it;
return *__it;
static_assert(extent != 0);
__glibcxx_assert(!empty());
return *(this->_M_ptr + (size() - 1));
}
constexpr reference
operator[](index_type __idx) const noexcept
{ return *(this->_M_ptr + __idx); }
{
static_assert(extent != 0);
__glibcxx_assert(__idx < size());
return *(this->_M_ptr + __idx);
}
constexpr pointer
data() const noexcept
{ return this->_M_ptr; }
constexpr index_type
size() const noexcept
{ return this->__base_t::_M_extent(); }
// iterator support
constexpr index_type
size_bytes() const noexcept
{ return this->__base_t::_M_extent() * sizeof(element_type); }
constexpr bool
empty() const noexcept
{ return size() == 0; }
// observers: iterator support
constexpr iterator
begin() const noexcept
{ return iterator(this->_M_ptr); }
@ -357,70 +367,85 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
crend() const noexcept
{ return const_reverse_iterator(this->cbegin()); }
// observers: subranges
// subviews
template<size_t _Count>
constexpr span<element_type, _Count>
first() const
first() const noexcept
{
__glibcxx_assert(_Count < size());
if constexpr (_Extent == dynamic_extent)
__glibcxx_assert(_Count <= size());
else
static_assert(_Count <= extent);
return { this->data(), _Count };
}
constexpr span<element_type, dynamic_extent>
first(index_type __count) const
first(index_type __count) const noexcept
{
__glibcxx_assert(__count < size());
__glibcxx_assert(__count <= size());
return { this->data(), __count };
}
template<size_t _Count>
constexpr span<element_type, _Count>
last() const
last() const noexcept
{
static_assert(_Count == dynamic_extent ||
_Extent == dynamic_extent || _Count <= _Extent,
"Count or Extent are dynamic, "
"or the Count is less than the static extent");
__glibcxx_assert(_Count <= size());
if constexpr (_Extent == dynamic_extent)
__glibcxx_assert(_Count <= size());
else
static_assert(_Count <= extent);
return { this->data() + (this->size() - _Count), _Count };
}
constexpr span<element_type, dynamic_extent>
last(index_type __count) const
last(index_type __count) const noexcept
{
__glibcxx_assert(__count < size());
index_type __offset = (this->size() - __count);
return { this->data() + __offset, __count };
__glibcxx_assert(__count <= size());
return { this->data() + (this->size() - __count), __count };
}
template<size_t _Offset, size_t _Count = dynamic_extent>
constexpr auto
subspan() const
subspan() const noexcept
-> span<element_type, _S_subspan_extent<_Offset, _Count>()>
{
static_assert(_Count == dynamic_extent ||
_Extent == dynamic_extent ||
(_Offset + _Count) <= _Extent,
"Count or Extent are dynamic, "
"or the Count + Offset is less than the static extent");
constexpr size_t __span_extent =
(_Count != dynamic_extent
? _Count
: (_Extent != dynamic_extent ? _Extent - _Offset
: dynamic_extent));
using __span_t = span<element_type, __span_extent>;
if constexpr(_Count != dynamic_extent)
if constexpr (_Extent == dynamic_extent)
__glibcxx_assert(_Offset <= size());
else
static_assert(_Offset <= extent);
if constexpr (_Count == dynamic_extent)
return { this->data() + _Offset, this->size() - _Offset };
else
{
__glibcxx_assert((_Offset + _Count) < size());
if constexpr (_Extent == dynamic_extent)
{
__glibcxx_assert(_Count <= size());
__glibcxx_assert(_Count <= (size() - _Offset));
}
else
{
static_assert(_Count <= extent);
static_assert(_Count <= (extent - _Offset));
}
return { this->data() + _Offset, _Count };
}
return __span_t(this->data() + _Offset,
(_Count == dynamic_extent ? this->size() - _Offset : _Count));
}
constexpr span<element_type, dynamic_extent>
subspan(index_type __offset, index_type __count = dynamic_extent) const
noexcept
{
return {this->data() + __offset,
__count == dynamic_extent ? this->size() - __offset : __count};
__glibcxx_assert(__offset <= size());
if (__count == dynamic_extent)
__count = this->size() - __offset;
else
{
__glibcxx_assert(__count <= size());
__glibcxx_assert(__offset + __count <= size());
}
return {this->data() + __offset, __count};
}
// observers: range helpers
@ -434,51 +459,54 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return __sp.end(); }
private:
[[no_unique_address]] __detail::__extent_storage<extent> _M_extent;
pointer _M_ptr;
};
// deduction guides
template<typename _Type, size_t _ArrayExtent>
span(_Type(&)[_ArrayExtent])->span<_Type, _ArrayExtent>;
span(_Type(&)[_ArrayExtent]) -> span<_Type, _ArrayExtent>;
template<typename _Type, size_t _ArrayExtent>
span(array<_Type, _ArrayExtent>&)->span<_Type, _ArrayExtent>;
span(array<_Type, _ArrayExtent>&) -> span<_Type, _ArrayExtent>;
template<typename _Type, size_t _ArrayExtent>
span(const array<_Type, _ArrayExtent>&)
->span<const _Type, _ArrayExtent>;
-> span<const _Type, _ArrayExtent>;
#if defined(_GLIBCXX_P1394) && _GLIBCXX_P1394
template<typename _ContiguousIterator, typename _Sentinel>
span(_ContiguousIterator, _Sentinel)
->span<remove_reference_t<
-> span<remove_reference_t<
typename iterator_traits<_ContiguousIterator>::reference>>;
template<typename _Range>
span(_Range &&)
->span<remove_reference_t<typename iterator_traits<decltype(
::std::__adl_begin(::std::declval<_Range&>()))>::reference>>;
-> span<remove_reference_t<typename iterator_traits<
decltype(std::__adl_begin(::std::declval<_Range&>()))>::reference>>;
#else
template<typename _Container>
span(_Container&)->span<typename _Container::value_type>;
span(_Container&) -> span<typename _Container::value_type>;
template<typename _Container>
span(const _Container&)->span<const typename _Container::value_type>;
span(const _Container&) -> span<const typename _Container::value_type>;
#endif // P1394
template<typename _Type, size_t _Extent>
inline
span<const byte, _Extent == dynamic_extent
? dynamic_extent : _Extent * sizeof(_Type)>
inline as_bytes(span<_Type, _Extent> __sp) noexcept
as_bytes(span<_Type, _Extent> __sp) noexcept
{
return {reinterpret_cast<const byte*>(__sp.data()), __sp.size_bytes()};
}
template<typename _Type, size_t _Extent>
inline
span<byte, _Extent == dynamic_extent
? dynamic_extent : _Extent * sizeof(_Type)>
as_writable_bytes(span<_Type, _Extent> __sp) noexcept
@ -491,9 +519,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr _Type&
get(span<_Type, _Extent> __sp) noexcept
{
static_assert(_Extent != dynamic_extent
&& (_Extent > 0) && (_Index < _Extent),
"std::get can only be used with a span of non-dynamic (fixed) extent");
static_assert(_Extent != dynamic_extent && _Index < _Extent,
"get<I> can only be used with a span of non-dynamic (fixed) extent");
return __sp[_Index];
}
@ -508,10 +535,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<size_t _Index, typename _Type, size_t _Extent>
struct tuple_element<_Index, span<_Type, _Extent>>
{
static_assert(_Extent != dynamic_extent, "tuple_size can only "
static_assert(_Extent != dynamic_extent, "tuple_element can only "
"be used with a span of non-dynamic (fixed) extent");
static_assert(_Index < _Extent, "Index is less than Extent");
using type = typename span<_Type, _Extent>::element_type;
using type = _Type;
};
_GLIBCXX_END_NAMESPACE_VERSION

4
libstdc++-v3/include/std/version
View File

@ -166,10 +166,8 @@
#endif
#define __cpp_lib_list_remove_return_type 201806L
#define __cpp_lib_math_constants 201907L
#define __cpp_lib_span 201902L
#define __cpp_lib_to_array 201907L
// FIXME: they forgot this feature test macro
// get on someone's back about it in Belfast!!!
#define __cpp_lib_span 201911
#endif // C++2a
#endif // C++17
#endif // C++14

27
libstdc++-v3/testsuite/23_containers/span/1.cc Normal file
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@ -0,0 +1,27 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
#ifndef __cpp_lib_span
# error "Feature-test macro for span missing in <span>"
#elif __cpp_lib_span != 201902L
# error "Feature-test macro for span has wrong value in <span>"
#endif

27
libstdc++-v3/testsuite/23_containers/span/2.cc Normal file
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@ -0,0 +1,27 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <version>
#ifndef __cpp_lib_span
# error "Feature-test macro for span missing in <version>"
#elif __cpp_lib_span != 201902L
# error "Feature-test macro for span has wrong value in <version>"
#endif

28
libstdc++-v3/testsuite/23_containers/span/back_assert_neg.cc Normal file
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@ -0,0 +1,28 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
std::span<int, std::dynamic_extent> s;
s.back();
}

29
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// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
void
test01()
{
std::span<int, 0> s;
s.back(); // { dg-error "here" }
}
// { dg-error "static assertion failed" "" { target *-*-* } 0 }

29
libstdc++-v3/testsuite/23_containers/span/first_2_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.first(5);
}

29
libstdc++-v3/testsuite/23_containers/span/first_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.first<5>();
}

30
libstdc++-v3/testsuite/23_containers/span/first_neg.cc Normal file
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@ -0,0 +1,30 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
void
test01()
{
int a[4];
std::span<int, 4> s(a);
s.first<5>(); // { dg-error "here" }
}
// { dg-error "static assertion failed" "" { target *-*-* } 0 }

28
libstdc++-v3/testsuite/23_containers/span/front_assert_neg.cc Normal file
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@ -0,0 +1,28 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
std::span<int, std::dynamic_extent> s;
s.front();
}

29
libstdc++-v3/testsuite/23_containers/span/front_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
void
test01()
{
std::span<int, 0> s;
s.front(); // { dg-error "here" }
}
// { dg-error "static assertion failed" "" { target *-*-* } 0 }

28
libstdc++-v3/testsuite/23_containers/span/index_op_assert_neg.cc Normal file
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@ -0,0 +1,28 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
std::span<int, std::dynamic_extent> s;
s[99];
}

29
libstdc++-v3/testsuite/23_containers/span/index_op_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
void
test01()
{
std::span<int, 0> s;
s[99]; // { dg-error "here" }
}
// { dg-error "static assertion failed" "" { target *-*-* } 0 }

29
libstdc++-v3/testsuite/23_containers/span/last_2_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.last(5);
}

29
libstdc++-v3/testsuite/23_containers/span/last_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.last<5>();
}

11
libstdc++-v3/testsuite/23_containers/span/last_neg.cc
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@ -15,15 +15,16 @@
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=c++2a" }
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
int
main()
void
test01()
{
std::span<int, 2> myspan(nullptr, 2);
myspan.last<3>(); // { dg-error "here" }
int a[2];
std::span<int, 2> s(a);
s.last<3>(); // { dg-error "here" }
}
// { dg-error "static assertion failed" "" { target *-*-* } 0 }

29
libstdc++-v3/testsuite/23_containers/span/subspan_2_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.subspan<2, 5>();
}

29
libstdc++-v3/testsuite/23_containers/span/subspan_3_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.subspan<2, 3>();
}

29
libstdc++-v3/testsuite/23_containers/span/subspan_4_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.subspan(5, 0);
}

29
libstdc++-v3/testsuite/23_containers/span/subspan_5_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.subspan(2, 5);
}

29
libstdc++-v3/testsuite/23_containers/span/subspan_6_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.subspan(2, 3);
}

29
libstdc++-v3/testsuite/23_containers/span/subspan_assert_neg.cc Normal file
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@ -0,0 +1,29 @@
// Copyright (C) 2019 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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 this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { xfail c++2a } }
#define _GLIBCXX_ASSERTIONS
#include <span>
int main()
{
int a[4];
std::span<int, std::dynamic_extent> s(a);
s.subspan<5, 0>();
}

28
libstdc++-v3/testsuite/23_containers/span/subspan_neg.cc
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@ -15,15 +15,33 @@
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=c++2a" }
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <span>
int
main()
void
test01()
{
std::span<int, 2> myspan(nullptr, 2);
myspan.subspan<3, 1>(); // { dg-error "here" }
int a[4];
std::span<int, 4> s(a);
s.subspan<5, 0>(); // { dg-error "here" }
}
void
test02()
{
int a[4];
std::span<int, 4> s(a);
s.subspan<3, 5>(); // { dg-error "here" }
}
void
test03()
{
int a[4];
std::span<int, 4> s(a);
s.subspan<3, 2>(); // { dg-error "here" }
}
// { dg-error "static assertion failed" "" { target *-*-* } 0 }