vsapsai updated this revision to Diff 153430.
vsapsai added a comment.
Herald added a subscriber: dexonsmith.
- Don't check `!__has_construct` for `__construct_range_forward`.
Incompatible types will cause a lack of `construct` but it doesn't mean we
should use memcpy instead. And missing `_Alloc::construct` doesn't mean
`alloc_traits::construct` will fail, so falling back on memcpy can be
premature.
https://reviews.llvm.org/D48342
Files:
libcxx/include/memory
libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_different_value_type.pass.cpp
Index: libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_different_value_type.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_different_value_type.pass.cpp
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <vector>
+
+// template <class InputIter> vector(InputIter first, InputIter last);
+
+// Initialize a vector with a different value type. Make sure initialization
+// is performed with each element value, not with a memory blob.
+
+#include <vector>
+#include <cassert>
+#include <cfloat>
+#include <cmath>
+
+int main()
+{
+ int array[3] = {0, 1, 2};
+ std::vector<float> v(array, array + 3);
+ assert(std::fabs(v[0] - 0.0f) < FLT_EPSILON);
+ assert(std::fabs(v[1] - 1.0f) < FLT_EPSILON);
+ assert(std::fabs(v[2] - 2.0f) < FLT_EPSILON);
+}
Index: libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
===================================================================
--- libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
+++ libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
@@ -50,6 +50,26 @@
#endif
+template <class T>
+struct cpp03_allocator : bare_allocator<T> {
+ typedef T value_type;
+ typedef value_type* pointer;
+
+ static bool construct_called;
+
+ void construct(pointer p, const value_type& val)
+ {
+ ::new(p) value_type(val);
+ construct_called = true;
+ }
+
+ std::size_t max_size() const
+ {
+ return UINT_MAX / sizeof(T);
+ }
+};
+template <class T> bool cpp03_allocator<T>::construct_called = false;
+
void basic_tests() {
{
int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};
@@ -129,9 +149,22 @@
}
void test_ctor_under_alloc() {
-#if TEST_STD_VER >= 11
int arr1[] = {42};
int arr2[] = {1, 101, 42};
+ {
+ typedef std::vector<int, cpp03_allocator<int> > C;
+ {
+ cpp03_allocator<int>::construct_called = false;
+ C v(arr1, arr1 + 1);
+ assert(cpp03_allocator<int>::construct_called);
+ }
+ {
+ cpp03_allocator<int>::construct_called = false;
+ C v(arr2, arr2 + 3);
+ assert(cpp03_allocator<int>::construct_called);
+ }
+ }
+#if TEST_STD_VER >= 11
{
using C = TCT::vector<>;
using T = typename C::value_type;
@@ -162,6 +195,17 @@
//C v(It(arr2), It(std::end(arr2)), a);
}
}
+ {
+ using C = std::vector<int, ContainerTestAllocator<int, int> >;
+ {
+ ExpectConstructGuard<int&> G(1);
+ C v(arr1, arr1 + 1);
+ }
+ {
+ ExpectConstructGuard<int&> G(3);
+ C v(arr2, arr2 + 3);
+ }
+ }
#endif
}
Index: libcxx/include/memory
===================================================================
--- libcxx/include/memory
+++ libcxx/include/memory
@@ -1459,24 +1459,102 @@
#else // _LIBCPP_CXX03_LANG
-#ifndef _LIBCPP_HAS_NO_VARIADICS
+template <class _Alloc, class _Pointer>
+struct __has_construct_test_0
+{
+private:
+ template <class _Xp> static true_type __test(void (_Xp::*)(_Pointer));
+ template <class _Xp> static false_type __test(...);
-template <class _Alloc, class _Pointer, class ..._Args>
-struct __has_construct
- : false_type
+ template <class _Xp>
+ static decltype(__test(&_Xp::construct)) __test_exist(decltype(&_Xp::construct));
+ template <class _Xp> static false_type __test_exist(...);
+
+ typedef decltype(__test_exist<_Alloc>(0)) type;
+public:
+ static const bool value = type::value;
+};
+
+template <class _Alloc, class _Pointer>
+struct __has_construct_0
+ : integral_constant<bool, __has_construct_test_0<_Alloc, _Pointer>::value>
{
};
-#else // _LIBCPP_HAS_NO_VARIADICS
+template <class _Alloc, class _Pointer, class _A0>
+struct __has_construct_test_1
+{
+private:
+ template <class _Xp> static true_type __test(void (_Xp::*)(_Pointer, _A0));
+ template <class _Xp> static false_type __test(...);
+
+ template <class _Xp>
+ static decltype(__test(&_Xp::construct)) __test_exist(decltype(&_Xp::construct));
+ template <class _Xp> static false_type __test_exist(...);
+
+ typedef decltype(__test_exist<_Alloc>(0)) type;
+public:
+ static const bool value = type::value;
+};
+
+template <class _Alloc, class _Pointer, class _A0>
+struct __has_construct_1
+ : integral_constant<bool, __has_construct_test_1<_Alloc, _Pointer, _A0>::value>
+{
+};
+
+template <class _Alloc, class _Pointer, class _A0, class _A1>
+struct __has_construct_test_2
+{
+private:
+ template <class _Xp> static true_type __test(void (_Xp::*)(_Pointer, _A0, _A1));
+ template <class _Xp> static false_type __test(...);
+
+ template <class _Xp>
+ static decltype(__test(&_Xp::construct)) __test_exist(decltype(&_Xp::construct));
+ template <class _Xp> static false_type __test_exist(...);
+
+ typedef decltype(__test_exist<_Alloc>(0)) type;
+public:
+ static const bool value = type::value;
+};
+
+template <class _Alloc, class _Pointer, class _A0, class _A1>
+struct __has_construct_2
+ : integral_constant<bool, __has_construct_test_2<_Alloc, _Pointer, _A0, _A1>::value>
+{
+};
+
+template <class _Alloc, class _Pointer, class _A0, class _A1, class _A2>
+struct __has_construct_test_3
+{
+private:
+ template <class _Xp> static true_type __test(void (_Xp::*)(_Pointer, _A0, _A1, _A2));
+ template <class _Xp> static false_type __test(...);
+
+ template <class _Xp>
+ static decltype(__test(&_Xp::construct)) __test_exist(decltype(&_Xp::construct));
+ template <class _Xp> static false_type __test_exist(...);
+
+ typedef decltype(__test_exist<_Alloc>(0)) type;
+public:
+ static const bool value = type::value;
+};
+
+template <class _Alloc, class _Pointer, class _A0, class _A1, class _A2>
+struct __has_construct_3
+ : integral_constant<bool, __has_construct_test_3<_Alloc, _Pointer, _A0, _A1, _A2>::value>
+{
+};
template <class _Alloc, class _Pointer, class _Args>
struct __has_construct
- : false_type
+ : integral_constant<bool,
+ __has_construct_test_1<_Alloc, _Pointer, _Args>::value
+ || __has_construct_test_1<_Alloc, _Pointer, const _Args&>::value>
{
};
-#endif // _LIBCPP_HAS_NO_VARIADICS
-
template <class _Alloc, class _Pointer>
struct __has_destroy
: false_type
@@ -1564,29 +1642,33 @@
#else // _LIBCPP_HAS_NO_VARIADICS
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
- static void construct(allocator_type&, _Tp* __p)
+ static void construct(allocator_type& __a, _Tp* __p)
{
- ::new ((void*)__p) _Tp();
+ __construct(__has_construct_0<allocator_type, _Tp*>(), __a,
+ __p);
}
template <class _Tp, class _A0>
_LIBCPP_INLINE_VISIBILITY
- static void construct(allocator_type&, _Tp* __p, const _A0& __a0)
+ static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0)
{
- ::new ((void*)__p) _Tp(__a0);
+ __construct(__has_construct_1<allocator_type, _Tp*, const _A0&>(),
+ __a, __p, __a0);
}
template <class _Tp, class _A0, class _A1>
_LIBCPP_INLINE_VISIBILITY
- static void construct(allocator_type&, _Tp* __p, const _A0& __a0,
+ static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0,
const _A1& __a1)
{
- ::new ((void*)__p) _Tp(__a0, __a1);
+ __construct(__has_construct_2<allocator_type, _Tp*, const _A0&, const _A1&>(),
+ __a, __p, __a0, __a1);
}
template <class _Tp, class _A0, class _A1, class _A2>
_LIBCPP_INLINE_VISIBILITY
- static void construct(allocator_type&, _Tp* __p, const _A0& __a0,
+ static void construct(allocator_type& __a, _Tp* __p, const _A0& __a0,
const _A1& __a1, const _A2& __a2)
{
- ::new ((void*)__p) _Tp(__a0, __a1, __a2);
+ __construct(__has_construct_3<allocator_type, _Tp*, const _A0&, const _A1&, const _A2&>(),
+ __a, __p, __a0, __a1, __a2);
}
#endif // _LIBCPP_HAS_NO_VARIADICS
@@ -1646,23 +1728,23 @@
construct(__a, _VSTD::__to_raw_pointer(__begin2), *__begin1);
}
- template <class _Tp>
+ template <class _SourceTp, class _DestTp>
_LIBCPP_INLINE_VISIBILITY
static
typename enable_if
<
- (is_same<allocator_type, allocator<_Tp> >::value
- || !__has_construct<allocator_type, _Tp*, _Tp>::value) &&
- is_trivially_move_constructible<_Tp>::value,
+ (is_same<allocator_type, allocator<typename _VSTD::remove_const<_SourceTp>::type> >::value
+ || is_same<allocator_type, allocator<const _SourceTp> >::value) &&
+ is_trivially_move_constructible<_DestTp>::value,
void
>::type
- __construct_range_forward(allocator_type&, _Tp* __begin1, _Tp* __end1, _Tp*& __begin2)
+ __construct_range_forward(allocator_type&, _SourceTp* __begin1, _SourceTp* __end1, _DestTp*& __begin2)
{
- typedef typename remove_const<_Tp>::type _Vp;
+ typedef typename remove_const<_DestTp>::type _Vp;
ptrdiff_t _Np = __end1 - __begin1;
if (_Np > 0)
{
- _VSTD::memcpy(const_cast<_Vp*>(__begin2), __begin1, _Np * sizeof(_Tp));
+ _VSTD::memcpy(const_cast<_Vp*>(__begin2), __begin1, _Np * sizeof(_DestTp));
__begin2 += _Np;
}
}
@@ -1720,6 +1802,53 @@
{
::new ((void*)__p) _Tp(_VSTD::forward<_Args>(__args)...);
}
+#else // _LIBCPP_HAS_NO_VARIADICS
+ template <class _Tp>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(true_type, allocator_type& __a, _Tp* __p)
+ {__a.construct(__p);}
+ template <class _Tp>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(false_type, allocator_type&, _Tp* __p)
+ {
+ ::new ((void*)__p) _Tp();
+ }
+ template <class _Tp, class _A0>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(true_type, allocator_type& __a, _Tp* __p,
+ const _A0& __a0)
+ {__a.construct(__p, __a0);}
+ template <class _Tp, class _A0>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(false_type, allocator_type&, _Tp* __p,
+ const _A0& __a0)
+ {
+ ::new ((void*)__p) _Tp(__a0);
+ }
+ template <class _Tp, class _A0, class _A1>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(true_type, allocator_type& __a, _Tp* __p,
+ const _A0& __a0, const _A1& __a1)
+ {__a.construct(__p, __a0, __a1);}
+ template <class _Tp, class _A0, class _A1>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(false_type, allocator_type&, _Tp* __p,
+ const _A0& __a0, const _A1& __a1)
+ {
+ ::new ((void*)__p) _Tp(__a0, __a1);
+ }
+ template <class _Tp, class _A0, class _A1, class _A2>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(true_type, allocator_type& __a, _Tp* __p,
+ const _A0& __a0, const _A1& __a1, const _A2& __a2)
+ {__a.construct(__p, __a0, __a1, __a2);}
+ template <class _Tp, class _A0, class _A1, class _A2>
+ _LIBCPP_INLINE_VISIBILITY
+ static void __construct(false_type, allocator_type&, _Tp* __p,
+ const _A0& __a0, const _A1& __a1, const _A2& __a2)
+ {
+ ::new ((void*)__p) _Tp(__a0, __a1, __a2);
+ }
#endif // _LIBCPP_HAS_NO_VARIADICS
template <class _Tp>
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