maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Somehow aligned_union got dropped through the cracks. This adds it. Did a drive-by fix of alignment_of while I was in the neighborhood. 

llvm-svn: 180036
This commit is contained in:
Howard Hinnant 2013-04-22 19:37:49 +00:00
parent 74679a93b2
commit 20428e94e0
4 changed files with 107 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
libcxx/include/type_traits
View File

@ -129,6 +129,7 @@ namespace std
template <class T> struct alignment_of;
template <size_t Len, size_t Align = most_stringent_alignment_requirement>
struct aligned_storage;
template <size_t Len, class... Types> struct aligned_union;
template <class T> struct decay;
template <class... T> struct common_type;
@ -828,10 +829,8 @@ template <class _Tp> struct _LIBCPP_TYPE_VIS has_virtual_destructor
// alignment_of
template <class _Tp> struct __alignment_of {_Tp __lx;};
template <class _Tp> struct _LIBCPP_TYPE_VIS alignment_of
: public integral_constant<size_t, __alignof__(__alignment_of<typename remove_all_extents<_Tp>::type>)> {};
: public integral_constant<size_t, __alignof__(_Tp)> {};
// aligned_storage
@ -960,6 +959,38 @@ _CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000);
#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION
#ifndef _LIBCPP_HAS_NO_VARIADICS
// aligned_union
template <size_t _I0, size_t ..._In>
struct __static_max;
template <size_t _I0>
struct __static_max<_I0>
{
static const size_t value = _I0;
};
template <size_t _I0, size_t _I1, size_t ..._In>
struct __static_max<_I0, _I1, _In...>
{
static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value :
__static_max<_I1, _In...>::value;
};
template <size_t _Len, class _Type0, class ..._Types>
struct aligned_union
{
static const size_t alignment_value = __static_max<__alignof__(_Type0),
__alignof__(_Types)...>::value;
static const size_t __len = __static_max<_Len, sizeof(_Type0),
sizeof(_Types)...>::value;
typedef typename aligned_storage<__len, alignment_value>::type type;
};
#endif // _LIBCPP_HAS_NO_VARIADICS
// __promote
template <class _A1, class _A2 = void, class _A3 = void,

12
libcxx/test/utilities/meta/meta.trans/meta.trans.other/aligned_storage.pass.cpp
View File

@ -92,17 +92,17 @@ int main()
}
{
typedef std::aligned_storage<8>::type T1;
static_assert(std::alignment_of<T1>::value == (sizeof(long) == 4 ? 4 : 8), "");
static_assert(std::alignment_of<T1>::value == 8, "");
static_assert(sizeof(T1) == 8, "");
}
{
typedef std::aligned_storage<9>::type T1;
static_assert(std::alignment_of<T1>::value == (sizeof(long) == 4 ? 4 : 8), "");
static_assert(sizeof(T1) == (sizeof(long) == 4 ? 12 : 16), "");
static_assert(std::alignment_of<T1>::value == 8, "");
static_assert(sizeof(T1) == 16, "");
}
{
typedef std::aligned_storage<15>::type T1;
static_assert(std::alignment_of<T1>::value == (sizeof(long) == 4 ? 4 : 8), "");
static_assert(std::alignment_of<T1>::value == 8, "");
static_assert(sizeof(T1) == 16, "");
}
{
@ -117,7 +117,7 @@ int main()
}
{
typedef std::aligned_storage<10>::type T1;
static_assert(std::alignment_of<T1>::value == (sizeof(long) == 4 ? 4 : 8), "");
static_assert(sizeof(T1) == (sizeof(long) == 4 ? 12 : 16), "");
static_assert(std::alignment_of<T1>::value == 8, "");
static_assert(sizeof(T1) == 16, "");
}
}

65
libcxx/test/utilities/meta/meta.trans/meta.trans.other/aligned_union.pass.cpp Normal file
View File

@ -0,0 +1,65 @@
//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// type_traits
// aligned_union<size_t Len, class ...Types>
#include <type_traits>
int main()
{
#ifndef _LIBCPP_HAS_NO_VARIADICS
{
typedef std::aligned_union<10, char >::type T1;
static_assert(std::alignment_of<T1>::value == 1, "");
static_assert(sizeof(T1) == 10, "");
}
{
typedef std::aligned_union<10, short >::type T1;
static_assert(std::alignment_of<T1>::value == 2, "");
static_assert(sizeof(T1) == 10, "");
}
{
typedef std::aligned_union<10, int >::type T1;
static_assert(std::alignment_of<T1>::value == 4, "");
static_assert(sizeof(T1) == 12, "");
}
{
typedef std::aligned_union<10, double >::type T1;
static_assert(std::alignment_of<T1>::value == 8, "");
static_assert(sizeof(T1) == 16, "");
}
{
typedef std::aligned_union<10, short, char >::type T1;
static_assert(std::alignment_of<T1>::value == 2, "");
static_assert(sizeof(T1) == 10, "");
}
{
typedef std::aligned_union<10, char, short >::type T1;
static_assert(std::alignment_of<T1>::value == 2, "");
static_assert(sizeof(T1) == 10, "");
}
{
typedef std::aligned_union<2, int, char, short >::type T1;
static_assert(std::alignment_of<T1>::value == 4, "");
static_assert(sizeof(T1) == 4, "");
}
{
typedef std::aligned_union<2, char, int, short >::type T1;
static_assert(std::alignment_of<T1>::value == 4, "");
static_assert(sizeof(T1) == 4, "");
}
{
typedef std::aligned_union<2, char, short, int >::type T1;
static_assert(std::alignment_of<T1>::value == 4, "");
static_assert(sizeof(T1) == 4, "");
}
#endif
}

4
libcxx/test/utilities/meta/meta.unary.prop.query/alignment_of.pass.cpp
View File

@ -30,13 +30,13 @@ public:
int main()
{
test_alignment_of<int&, sizeof(long) == 4 ? 4 : 8>();
test_alignment_of<int&, 4>();
test_alignment_of<Class, 1>();
test_alignment_of<int*, sizeof(long) == 4 ? 4 : 8>();
test_alignment_of<const int*, sizeof(long) == 4 ? 4 : 8>();
test_alignment_of<char[3], 1>();
test_alignment_of<int, 4>();
test_alignment_of<double, sizeof(long) == 4 ? 4 : 8>();
test_alignment_of<double, 8>();
test_alignment_of<bool, 1>();
test_alignment_of<unsigned, 4>();
}