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move.h (forward): Implement N3143, resolving US 90. 

2010-11-11  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/move.h (forward): Implement N3143, resolving US 90.
	* testsuite/20_util/forward/a.cc: New.
	* testsuite/20_util/forward/b.cc: Likewise.
	* testsuite/20_util/forward/c_neg.cc: Likewise.
	* testsuite/20_util/forward/d.cc: Likewise.
	* testsuite/20_util/forward/e.cc: Likewise.
	* testsuite/20_util/forward/f_neg.cc: Likewise.

From-SVN: r166599
This commit is contained in:
Paolo Carlini 2010-11-11 13:10:49 +00:00 committed by Paolo Carlini
parent 280fedf067
commit ad26988476
8 changed files with 474 additions and 19 deletions
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10
libstdc++-v3/ChangeLog
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@ -1,3 +1,13 @@
2010-11-11 Paolo Carlini <paolo.carlini@oracle.com>
* include/bits/move.h (forward): Implement N3143, resolving US 90.
* testsuite/20_util/forward/a.cc: New.
* testsuite/20_util/forward/b.cc: Likewise.
* testsuite/20_util/forward/c_neg.cc: Likewise.
* testsuite/20_util/forward/d.cc: Likewise.
* testsuite/20_util/forward/e.cc: Likewise.
* testsuite/20_util/forward/f_neg.cc: Likewise.
2010-11-10 François Dumont <francois.cppdevs@free.fr>
* include/profile/unordered_map (unordered_map<>::_M_profile_size):

29
libstdc++-v3/include/bits/move.h
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@ -51,29 +51,20 @@ _GLIBCXX_END_NAMESPACE
_GLIBCXX_BEGIN_NAMESPACE(std)
/// forward (as per N2835)
/// Forward lvalues as rvalues.
/// forward (as per N3143)
template<typename _Tp>
inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type
forward(typename std::common_type<_Tp>::type& __t)
inline _Tp&&
forward(typename std::remove_reference<_Tp>::type& __t)
{ return static_cast<_Tp&&>(__t); }
/// Forward rvalues as rvalues.
template<typename _Tp>
inline typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp&&>::type
forward(typename std::common_type<_Tp>::type&& __t)
{ return static_cast<_Tp&&>(__t); }
// Forward lvalues as lvalues.
template<typename _Tp>
inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type
forward(typename std::common_type<_Tp>::type __t)
{ return __t; }
// Prevent forwarding rvalues as const lvalues.
template<typename _Tp>
inline typename enable_if<is_lvalue_reference<_Tp>::value, _Tp>::type
forward(typename std::remove_reference<_Tp>::type&& __t) = delete;
inline _Tp&&
forward(typename std::remove_reference<_Tp>::type&& __t)
{
static_assert(!std::is_lvalue_reference<_Tp>::value, "template argument"
" substituting _Tp is an lvalue reference type");
return static_cast<_Tp&&>(__t);
}
/**
* @brief Move a value.

77
libstdc++-v3/testsuite/20_util/forward/a.cc Normal file
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@ -0,0 +1,77 @@
// { dg-options "-std=gnu++0x" }
// Copyright (C) 2010 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/>.
#include <list>
#include <testsuite_hooks.h>
template <class T>
struct C
{
T t_;
template <class U,
class = typename std::enable_if
<
!std::is_lvalue_reference<U>::value
>::type>
C(U&& u) : t_(std::forward<T>(std::move(u).get())) {}
};
class A
{
int data_;
public:
explicit
A(int data = 1)
: data_(data) {}
~A() { data_ = -1; }
void test() const
{
bool test __attribute__((unused)) = true;
VERIFY( data_ == 3 );
}
};
class Awrap
{
const A& a_;
public:
explicit Awrap(const A& a) : a_(a) { }
const A& get() const { return a_; }
};
template <class C>
void test(C c)
{
c.t_.test();
}
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
// Test A.
int main()
{
std::list<C<const A&> > list;
A a(3);
C<const A&> c((Awrap(a)));
list.push_back(c);
test(c);
test(list.front());
}

77
libstdc++-v3/testsuite/20_util/forward/b.cc Normal file
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@ -0,0 +1,77 @@
// { dg-options "-std=gnu++0x" }
// Copyright (C) 2010 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/>.
#include <list>
#include <testsuite_hooks.h>
template <class T>
struct C
{
T t_;
template <class U,
class = typename std::enable_if
<
!std::is_lvalue_reference<U>::value
>::type>
C(U&& u) : t_(std::forward<T>(std::move(u).get())) {}
};
class A
{
int data_;
public:
explicit
A(int data = 1)
: data_(data) { }
~A() { data_ = -1; }
void test() const
{
bool test __attribute__((unused)) = true;
VERIFY( data_ == 3 );
}
};
class Awrap
{
A a_;
public:
explicit Awrap(const A& a) : a_(a) { }
A get() const { return a_; }
};
template <class C>
void test(C c)
{
c.t_.test();
}
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
// Test B.
int main()
{
std::list<C<A> > list;
A a(3);
C<A> c((Awrap(a)));
list.push_back(c);
test(c);
test(list.front());
}

78
libstdc++-v3/testsuite/20_util/forward/c_neg.cc Normal file
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@ -0,0 +1,78 @@
// { dg-do compile }
// { dg-options "-std=gnu++0x" }
// Copyright (C) 2010 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-error "static assertion failed" "" { target *-*-* } 64 }
#include <list>
template <class T>
struct C
{
T t_;
template <class U,
class = typename std::enable_if
<
!std::is_lvalue_reference<U>::value
>::type>
C(U&& u) : t_(std::forward<T>(std::move(u).get())) {}
};
class A
{
int data_;
public:
explicit
A(int data = 1)
: data_(data) { }
~A() { data_ = -1; }
void test() const
{
__builtin_abort();
}
};
class Awrap
{
const A& a_;
public:
explicit Awrap(const A& a) : a_(a) {}
const A /* & */ get() const { return a_; }
};
template <class C>
void test(C c)
{
c.t_.test();
}
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
// Test C.
int main()
{
std::list<C<const A&> > list;
A a(3);
C<const A&> c((Awrap(a)));
list.push_back(c);
test(c);
test(list.front());
}

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libstdc++-v3/testsuite/20_util/forward/d.cc Normal file
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@ -0,0 +1,78 @@
// { dg-options "-std=gnu++0x" }
// Copyright (C) 2010 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/>.
#include <list>
#include <testsuite_hooks.h>
template <class T>
struct C
{
T t_;
template <class U,
class = typename std::enable_if
<
!std::is_lvalue_reference<U>::value
>::type>
C(U&& u) : t_(std::forward<T>(std::move(u).get())) { }
};
class A
{
int data_;
public:
explicit
A(int data = 1)
: data_(data) { }
~A() { data_ = -1; }
void test() const
{
bool test __attribute__((unused)) = true;
VERIFY( data_ == 3 );
}
};
class Awrap
{
A& a_;
public:
explicit Awrap(A& a) : a_(a) { }
const A& get() const { return a_; }
A& get() { return a_; }
};
template <class C>
void test(C c)
{
c.t_.test();
}
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
// Test D.
int main()
{
std::list<C<const A&> > list;
A a(3);
C<const A&> c((Awrap(a)));
list.push_back(c);
test(c);
test(list.front());
}

54
libstdc++-v3/testsuite/20_util/forward/e.cc Normal file
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@ -0,0 +1,54 @@
// { dg-do compile }
// { dg-options "-std=gnu++0x" }
// Copyright (C) 2010 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/>.
#include <utility>
template <class T>
struct C
{
T t_;
C() { }
template <class U,
class = typename std::enable_if
<
!std::is_lvalue_reference<U>::value
>::type>
C(U&& u) : t_(std::forward<T>(std::move(u).get())) { }
C(C&& c) : t_(std::forward<T>(c.t_)) { }
};
template <class T>
struct Derived
: C<T>
{
Derived() { }
Derived(Derived&& d) : C<T>(std::forward<C<T>>(d)) { }
};
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
// Test E.
int main()
{
Derived<int> d;
Derived<int> d2(std::move(d));
}

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libstdc++-v3/testsuite/20_util/forward/f_neg.cc Normal file
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@ -0,0 +1,90 @@
// { dg-do compile }
// { dg-options "-std=gnu++0x" }
// Copyright (C) 2010 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-error "static assertion failed" "" { target *-*-* } 64 }
#include <utility>
template <class T>
struct C
{
T t_;
C() {}
explicit C(const T& t) : t_(t) { }
template <class U,
class = typename std::enable_if
<
std::is_convertible<U, T>::value
>::type>
C(C<U>&& c) : t_(std::forward<T>(c.t_)) { }
};
class B;
class A
{
int data_;
friend class B;
public:
explicit
A(int data = 1)
: data_(data) { }
~A() { data_ = -1; }
void test() const
{
__builtin_abort();
}
};
class B
{
int data_;
public:
explicit
B(int data = 1)
: data_(data) { }
B(const A& a) : data_(a.data_) { }
B(A&& a) : data_(a.data_) { a.data_ = 100; }
~B() { data_ = -1; }
void test() const
{
__builtin_abort();
}
};
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
// Test F.
int main()
{
A a(3);
C<A> ca(a);
C<const B&> cb(std::move(ca));
cb.t_.test();
}