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forward_list.h (forward_list::assign): Dispatch to new functions based on assignability of elements.

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* include/bits/forward_list.h (forward_list::assign): Dispatch to new
	functions based on assignability of elements.
	(forward_list::_M_assign): Add overloaded functions for assigning
	via assignment or via clearing and insertion.
	(forward_list::_M_assign_val): Likewise.
	(forward_list::_M_move_assign(forward_list&&, false_type)): Do not
	erase elements that are not moved.
	* include/bits/forward_list.tcc (forward_list::operator=): Call
	assign() to copy elements.
	* testsuite/23_containers/forward_list/cons/10.cc: New.
	* testsuite/23_containers/forward_list/cons/11.cc: New.
	* testsuite/23_containers/forward_list/cons/12.cc: New.

From-SVN: r193057
This commit is contained in:
Jonathan Wakely 2012-11-01 01:30:34 +00:00 committed by Jonathan Wakely
parent d81aa38840
commit 362261e71f
6 changed files with 255 additions and 35 deletions
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15
libstdc++-v3/ChangeLog
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@ -1,3 +1,18 @@
2012-11-01 Jonathan Wakely <jwakely.gcc@gmail.com>
* include/bits/forward_list.h (forward_list::assign): Dispatch to new
functions based on assignability of elements.
(forward_list::_M_assign): Add overloaded functions for assigning
via assignment or via clearing and insertion.
(forward_list::_M_assign_val): Likewise.
(forward_list::_M_move_assign(forward_list&&, false_type)): Do not
erase elements that are not moved.
* include/bits/forward_list.tcc (forward_list::operator=): Call
assign() to copy elements.
* testsuite/23_containers/forward_list/cons/10.cc: New.
* testsuite/23_containers/forward_list/cons/11.cc: New.
* testsuite/23_containers/forward_list/cons/12.cc: New.
2012-10-31 Jonathan Yong <jon_y@users.sourceforge.net>
* config/os/mingw32-w64/os_defines.h: Do not define anymore

89
libstdc++-v3/include/bits/forward_list.h
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@ -589,7 +589,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
* in the range [@a __first,@a __last).
*
* Note that the assignment completely changes the %forward_list and
* that the number of elements of the resulting %forward_list's is the
* that the number of elements of the resulting %forward_list is the
* same as the number of elements assigned. Old data is lost.
*/
template<typename _InputIterator,
@ -597,9 +597,9 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
void
assign(_InputIterator __first, _InputIterator __last)
{
clear();
insert_after(cbefore_begin(), __first, __last);
}
typedef is_assignable<_Tp, decltype(*__first)> __assignable;
_M_assign(__first, __last, __assignable());
}
/**
* @brief Assigns a given value to a %forward_list.
@ -613,10 +613,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
*/
void
assign(size_type __n, const _Tp& __val)
{
clear();
insert_after(cbefore_begin(), __n, __val);
}
{ _M_assign_n(__n, __val, is_copy_assignable<_Tp>()); }
/**
* @brief Assigns an initializer_list to a %forward_list.
@ -628,10 +625,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
*/
void
assign(std::initializer_list<_Tp> __il)
{
clear();
insert_after(cbefore_begin(), __il);
}
{ assign(__il.begin(), __il.end()); }
/// Get a copy of the memory allocation object.
allocator_type
@ -1255,13 +1249,70 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
if (__list._M_get_Node_allocator() == this->_M_get_Node_allocator())
_M_move_assign(std::move(__list), std::true_type());
else
{
// The rvalue's allocator cannot be moved, or is not equal,
// so we need to individually move each element.
this->assign(std::__make_move_if_noexcept_iterator(__list.begin()),
std::__make_move_if_noexcept_iterator(__list.end()));
__list.clear();
}
// The rvalue's allocator cannot be moved, or is not equal,
// so we need to individually move each element.
this->assign(std::__make_move_if_noexcept_iterator(__list.begin()),
std::__make_move_if_noexcept_iterator(__list.end()));
}
// Called by assign(_InputIterator, _InputIterator) if _Tp is
// CopyAssignable.
template<typename _InputIterator>
void
_M_assign(_InputIterator __first, _InputIterator __last, true_type)
{
auto __prev = before_begin();
auto __curr = begin();
auto __end = end();
while (__curr != __end && __first != __last)
{
*__curr = *__first;
++__prev;
++__curr;
++__first;
}
if (__first != __last)
insert_after(__prev, __first, __last);
else if (__curr != __end)
erase_after(__prev, __end);
}
// Called by assign(_InputIterator, _InputIterator) if _Tp is not
// CopyAssignable.
template<typename _InputIterator>
void
_M_assign(_InputIterator __first, _InputIterator __last, false_type)
{
clear();
insert_after(cbefore_begin(), __first, __last);
}
// Called by assign(size_type, const _Tp&) if Tp is CopyAssignable
void
_M_assign_n(size_type __n, const _Tp& __val, true_type)
{
auto __prev = before_begin();
auto __curr = begin();
auto __end = end();
while (__curr != __end && __n > 0)
{
*__curr = __val;
++__prev;
++__curr;
--__n;
}
if (__n > 0)
insert_after(__prev, __n, __val);
else if (__curr != __end)
erase_after(__prev, __end);
}
// Called by assign(size_type, const _Tp&) if Tp is non-CopyAssignable
void
_M_assign_n(size_type __n, const _Tp& __val, false_type)
{
clear();
insert_after(cbefore_begin(), __n, __val);
}
};

17
libstdc++-v3/include/bits/forward_list.tcc
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@ -165,22 +165,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
}
std::__alloc_on_copy(__this_alloc, __that_alloc);
}
iterator __prev1 = before_begin();
iterator __curr1 = begin();
iterator __last1 = end();
const_iterator __first2 = __list.cbegin();
const_iterator __last2 = __list.cend();
while (__curr1 != __last1 && __first2 != __last2)
{
*__curr1 = *__first2;
++__prev1;
++__curr1;
++__first2;
}
if (__first2 == __last2)
erase_after(__prev1, __last1);
else
insert_after(__prev1, __first2, __last2);
assign(__list.cbegin(), __list.cend());
}
return *this;
}

58
libstdc++-v3/testsuite/23_containers/forward_list/cons/10.cc Normal file
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@ -0,0 +1,58 @@
// { dg-options "-std=gnu++11" }
// Copyright (C) 2012 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 Pred 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/>.
// 23.3.4.2 forward_list construction [forwardlist.cons]
#include <forward_list>
#include <testsuite_hooks.h>
#include <testsuite_allocator.h>
struct Counter
{
Counter() { ++create; }
Counter(const Counter&) { ++create; }
~Counter() { ++destroy; }
static int create;
static int destroy;
};
int Counter::create = 0;
int Counter::destroy = 0;
void test01()
{
typedef __gnu_test::uneq_allocator<Counter> alloc;
typedef std::forward_list<Counter, alloc> list;
{
Counter c;
list l( list(10, c, alloc(1)), alloc(2) );
VERIFY( Counter::create == 21 );
VERIFY( Counter::destroy == 10 );
}
VERIFY( Counter::destroy == 21 );
}
int main()
{
test01();
}

50
libstdc++-v3/testsuite/23_containers/forward_list/cons/11.cc Normal file
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@ -0,0 +1,50 @@
// { dg-options "-std=gnu++11" }
// Copyright (C) 2012 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 Pred 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/>.
// 23.3.4.2 forward_list construction [forwardlist.cons]
#include <forward_list>
#include <testsuite_hooks.h>
#include <testsuite_allocator.h>
bool fail = false;
struct A
{
A() = default;
A(const A&) { if (fail) throw fail; }
};
void test01()
{
typedef std::forward_list<A> list;
list l(2);
A from[2];
fail = true;
// Check existing elements are assigned to, instead of creating new ones.
// This is QoI, not required by the standard.
l.assign(from, from+2);
l.assign(2, from[0]);
}
int main()
{
test01();
}

61
libstdc++-v3/testsuite/23_containers/forward_list/cons/12.cc Normal file
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@ -0,0 +1,61 @@
// { dg-do compile }
// { dg-options "-std=gnu++11" }
// Copyright (C) 2012 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 Pred 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/>.
// 23.3.4.2 forward_list construction [forwardlist.cons]
#include <forward_list>
#include <testsuite_hooks.h>
#include <testsuite_allocator.h>
bool fail = false;
struct NonCopyAssignable
{
NonCopyAssignable() = default;
NonCopyAssignable(const NonCopyAssignable&) = default;
NonCopyAssignable(int) { }
NonCopyAssignable& operator=(const NonCopyAssignable&) = delete;
NonCopyAssignable& operator=(int) = delete;
};
void test01()
{
typedef std::forward_list<NonCopyAssignable> list;
list l(2);
NonCopyAssignable from[2];
int from2[2];
// Assigning non-Assignable elements is QoI, not required by the standard.
l = l;
l.assign(from, from+2);
l.assign(2, from[0]);
l.assign(from2, from2+2);
l.assign(2, from2[0]);
}
int main()
{
test01();
}