On 22 December 2016 at 19:11, Jonathan Wakely <[email protected]> wrote:
>> /// Default constructor, creates a unique_ptr that owns nothing.
>> + template <typename _Up = deleter_type,
>> + typename enable_if<
>> + __and_<__not_<is_pointer<_Up>>,
>> + is_default_constructible<_Up>>::value,
>> + bool>::type = false>
>
>
> Instead of repeating this condition half a dozen times, we could put
> it in the __uniq_ptr_impl class template and reuse it, as in the
> attached patch (and similarly for the unique_ptr<t[]> specialization).
> What do you think?
It needs to be a bit more dependent than in that patch, I think. I
adjusted the idea a bit,
a new patch attached. It cleans up the code a bit, so it's better, but
not a huge improvement.
>> constexpr unique_ptr() noexcept
>> : _M_t()
>> - { static_assert(!is_pointer<deleter_type>::value,
>> - "constructed with null function pointer deleter"); }
>> + { }
> The bodies of these constructors should be indented now that they're
> templates.
Hopefully fixed correctly in the new patch, please double-check.
>> --- /dev/null
>> +++ b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/default.cc
>> @@ -0,0 +1,40 @@
>> +// { dg-do compile { target c++11 } }
>> +
>> +// Copyright (C) 2011-2016 Free Software Foundation, Inc.
> Is this substantially copied from an existing file, or should it just
> be 2016? (Not that it really matters, as I don't think we should have
Should just be 2016, fixed.
2016-12-29 Ville Voutilainen <[email protected]>
Implement 2801, Default-constructibility of unique_ptr.
* include/bits/unique_ptr.h (__uniq_ptr_impl::_DeleterConstraint): New.
(unique_ptr::_DeleterConstraint): Likewise.
(unique_ptr()): Constrain.
(unique_ptr(pointer)): Likewise.
(unique_ptr(nullptr_t)): Likewise.
(unique_ptr<_Tp[], _Dp>::_DeleterConstraint): New.
(unique_ptr<_Tp[], _Dp>::unique_ptr()): Constrain.
(unique_ptr<_Tp[], _Dp>::unique_ptr(_Up)): Likewise.
(unique_ptr<_Tp[], _Dp>::unique_ptr(nullptr_t)): Likewise.
* testsuite/20_util/unique_ptr/assign/48635_neg.cc: Adjust.
* testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc: Likewise.
* testsuite/20_util/unique_ptr/cons/default.cc: New.
* testsuite/20_util/unique_ptr/cons/ptr_deleter_neg.cc: Adjust.
diff --git a/libstdc++-v3/include/bits/unique_ptr.h
b/libstdc++-v3/include/bits/unique_ptr.h
index 56e6ec0..f994c59 100644
--- a/libstdc++-v3/include/bits/unique_ptr.h
+++ b/libstdc++-v3/include/bits/unique_ptr.h
@@ -130,6 +130,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
};
public:
+ using _DeleterConstraint = enable_if<
+ __and_<__not_<is_pointer<_Dp>>,
+ is_default_constructible<_Dp>>::value>;
+
using pointer = typename _Ptr<_Tp, _Dp>::type;
__uniq_ptr_impl() = default;
@@ -152,6 +156,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template <typename _Tp, typename _Dp = default_delete<_Tp>>
class unique_ptr
{
+ template <class _Up>
+ using _DeleterConstraint =
+ typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint;
+
__uniq_ptr_impl<_Tp, _Dp> _M_t;
public:
@@ -175,10 +183,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Constructors.
/// Default constructor, creates a unique_ptr that owns nothing.
- constexpr unique_ptr() noexcept
- : _M_t()
- { static_assert(!is_pointer<deleter_type>::value,
- "constructed with null function pointer deleter"); }
+ template <typename _Up = _Dp,
+ typename = typename _DeleterConstraint<_Up>::type>
+ constexpr unique_ptr() noexcept
+ : _M_t()
+ { }
/** Takes ownership of a pointer.
*
@@ -186,11 +195,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
*
* The deleter will be value-initialized.
*/
- explicit
- unique_ptr(pointer __p) noexcept
- : _M_t(__p)
- { static_assert(!is_pointer<deleter_type>::value,
- "constructed with null function pointer deleter"); }
+ template <typename _Up = _Dp,
+ typename = typename _DeleterConstraint<_Up>::type>
+ explicit
+ unique_ptr(pointer __p) noexcept
+ : _M_t(__p)
+ { }
/** Takes ownership of a pointer.
*
@@ -218,7 +228,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
"rvalue deleter bound to reference"); }
/// Creates a unique_ptr that owns nothing.
- constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
+ template <typename _Up = _Dp,
+ typename = typename _DeleterConstraint<_Up>::type>
+ constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
// Move constructors.
@@ -384,6 +396,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp, typename _Dp>
class unique_ptr<_Tp[], _Dp>
{
+ template <typename _Up>
+ using _DeleterConstraint =
+ typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint;
+
__uniq_ptr_impl<_Tp, _Dp> _M_t;
template<typename _Up>
@@ -432,10 +448,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Constructors.
/// Default constructor, creates a unique_ptr that owns nothing.
- constexpr unique_ptr() noexcept
- : _M_t()
- { static_assert(!std::is_pointer<deleter_type>::value,
- "constructed with null function pointer deleter"); }
+ template <typename _Up = _Dp,
+ typename = typename _DeleterConstraint<_Up>::type>
+ constexpr unique_ptr() noexcept
+ : _M_t()
+ { }
/** Takes ownership of a pointer.
*
@@ -445,13 +462,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* The deleter will be value-initialized.
*/
template<typename _Up,
- typename = typename enable_if<
+ typename _Vp = _Dp,
+ typename = typename _DeleterConstraint<_Vp>::type,
+ typename = typename enable_if<
__safe_conversion_raw<_Up>::value, bool>::type>
- explicit
- unique_ptr(_Up __p) noexcept
- : _M_t(__p)
- { static_assert(!is_pointer<deleter_type>::value,
- "constructed with null function pointer deleter"); }
+ explicit
+ unique_ptr(_Up __p) noexcept
+ : _M_t(__p)
+ { }
/** Takes ownership of a pointer.
*
@@ -491,7 +509,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
/// Creates a unique_ptr that owns nothing.
- constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
+ template <typename _Up = _Dp,
+ typename = typename _DeleterConstraint<_Up>::type>
+ constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
template<typename _Up, typename _Ep,
typename = _Require<__safe_conversion_up<_Up, _Ep>>>
diff --git a/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
b/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
index e9655f1..00f1778 100644
--- a/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
@@ -42,10 +42,10 @@ void f()
std::unique_ptr<int, D&> ud(nullptr, d);
ub = std::move(ud); // { dg-error "no match" }
ub2 = ud; // { dg-error "no match" }
-// { dg-error "no type" "" { target *-*-* } 289 }
+// { dg-error "no type" "" { target *-*-* } 301 }
std::unique_ptr<int[], B&> uba(nullptr, b);
std::unique_ptr<int[], D&> uda(nullptr, d);
uba = std::move(uda); // { dg-error "no match" }
-// { dg-error "no type" "" { target *-*-* } 540 }
+// { dg-error "no type" "" { target *-*-* } 560 }
}
diff --git a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
index 3e6f41b..406be1a 100644
--- a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
@@ -39,7 +39,7 @@ test07()
std::unique_ptr<const A[]> cA3(p); // { dg-error "no matching function" }
std::unique_ptr<volatile A[]> vA3(p); // { dg-error "no matching function" }
std::unique_ptr<const volatile A[]> cvA3(p); // { dg-error "no matching
function" }
- // { dg-error "no type" "" { target *-*-* } 448 }
+ // { dg-error "no type" "" { target *-*-* } 467 }
}
template<typename T>
diff --git a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/default.cc
b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/default.cc
new file mode 100644
index 0000000..ceffdcd
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/default.cc
@@ -0,0 +1,40 @@
+// { dg-do compile { target c++11 } }
+
+// Copyright (C) 2016 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 <memory>
+#include <type_traits>
+
+static_assert(!std::is_default_constructible<std::unique_ptr<int,
+ std::default_delete<int>&>>::value, "");
+static_assert(!std::is_default_constructible<std::unique_ptr<int,
+ void(*)(int*)>>::value, "");
+static_assert(!std::is_constructible<std::unique_ptr<int,
+ std::default_delete<int>&>, int*>::value, "");
+static_assert(!std::is_constructible<std::unique_ptr<int,
+ void(*)(int*)>, int*>::value, "");
+
+static_assert(!std::is_default_constructible<std::unique_ptr<int[],
+ std::default_delete<int>&>>::value, "");
+static_assert(!std::is_default_constructible<std::unique_ptr<int[],
+ void(*)(int*)>>::value, "");
+static_assert(!std::is_constructible<std::unique_ptr<int[],
+ std::default_delete<int>&>, int*>::value, "");
+static_assert(!std::is_constructible<std::unique_ptr<int[],
+ void(*)(int*)>, int*>::value, "");
+
diff --git a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/ptr_deleter_neg.cc
b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/ptr_deleter_neg.cc
index 1aa8d43..6196b92 100644
--- a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/ptr_deleter_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/ptr_deleter_neg.cc
@@ -23,26 +23,31 @@
using std::unique_ptr;
-// { dg-prune-output "static assertion failed" }
+// { dg-error "no type" "" { target *-*-* } 187 }
+// { dg-error "no type" "" { target *-*-* } 199 }
+// { dg-error "no type" "" { target *-*-* } 232 }
+// { dg-error "no type" "" { target *-*-* } 452 }
+// { dg-error "no type" "" { target *-*-* } 466 }
+// { dg-error "no type" "" { target *-*-* } 513 }
void
test01()
{
- unique_ptr<long, void(*)(long*)> p1; // { dg-error "here" }
+ unique_ptr<long, void(*)(long*)> p1; // { dg-error "no matching" }
- unique_ptr<short, void(*)(short*)> p2(nullptr); // { dg-error "here" }
+ unique_ptr<short, void(*)(short*)> p2(nullptr); // { dg-error "no matching" }
- unique_ptr<int, void(*)(int*)> p3(new int); // { dg-error "here" }
+ unique_ptr<int, void(*)(int*)> p3(new int); // { dg-error "no matching" }
}
void
test02()
{
- unique_ptr<long[], void(*)(long*)> p1; // { dg-error "here" }
+ unique_ptr<long[], void(*)(long*)> p1; // { dg-error "no matching" }
- unique_ptr<short[], void(*)(short*)> p2(nullptr); // { dg-error "here" }
+ unique_ptr<short[], void(*)(short*)> p2(nullptr); // { dg-error "no
matching" }
- unique_ptr<int[], void(*)(int*)> p3(new int[1]); // { dg-error "here" }
+ unique_ptr<int[], void(*)(int*)> p3(new int[1]); // { dg-error "no matching"
}
}
