Author: marshall
Date: Sun Nov 12 19:59:22 2017
New Revision: 318011
URL: http://llvm.org/viewvc/llvm-project?rev=318011&view=rev
Log:
Implement P0550R2: Transformation Trait remove_cvref
Added:
libcxx/trunk/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
Modified:
libcxx/trunk/include/type_traits
libcxx/trunk/www/cxx2a_status.html
Modified: libcxx/trunk/include/type_traits
URL:
http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/type_traits?rev=318011&r1=318010&r2=318011&view=diff
==============================================================================
--- libcxx/trunk/include/type_traits (original)
+++ libcxx/trunk/include/type_traits Sun Nov 12 19:59:22 2017
@@ -150,6 +150,7 @@ namespace std
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 remove_cvref; // C++20
template <class T> struct decay;
template <class... T> struct common_type;
@@ -203,6 +204,8 @@ namespace std
template <std::size_t Len, class... Types>
using aligned_union_t = typename aligned_union<Len,Types...>::type;
// C++14
template <class T>
+ using remove_cvref_t = typename remove_cvref<T>::type; // C++20
+ template <class T>
using decay_t = typename decay<T>::type; // C++14
template <bool b, class T=void>
using enable_if_t = typename enable_if<b,T>::type; // C++14
@@ -1141,6 +1144,17 @@ template <class _Tp, class _Up>
struct __is_same_uncvref : is_same<typename __uncvref<_Tp>::type,
typename __uncvref<_Up>::type> {};
+#if _LIBCPP_STD_VER > 17
+// aligned_union - same as __uncvref
+template <class _Tp>
+struct remove_cvref {
+ using type = remove_cv_t<remove_reference_t<_Tp>>;
+};
+
+template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type;
+#endif
+
+
struct __any
{
__any(...);
Added:
libcxx/trunk/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
URL:
http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp?rev=318011&view=auto
==============================================================================
---
libcxx/trunk/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
(added)
+++
libcxx/trunk/test/std/utilities/meta/meta.trans/meta.trans.other/remove_cvref.pass.cpp
Sun Nov 12 19:59:22 2017
@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+
+// type_traits
+
+// remove_cvref
+
+#include <type_traits>
+
+#include "test_macros.h"
+
+template <class T, class U>
+void test_remove_cvref()
+{
+ static_assert((std::is_same<typename std::remove_cvref<T>::type,
U>::value), "");
+ static_assert((std::is_same< std::remove_cvref_t<T>,
U>::value), "");
+}
+
+int main()
+{
+ test_remove_cvref<void, void>();
+ test_remove_cvref<int, int>();
+ test_remove_cvref<const int, int>();
+ test_remove_cvref<const volatile int, int>();
+ test_remove_cvref<volatile int, int>();
+
+// Doesn't decay
+ test_remove_cvref<int[3], int[3]>();
+ test_remove_cvref<int const [3], int[3]>();
+ test_remove_cvref<int volatile [3], int[3]>();
+ test_remove_cvref<int const volatile [3], int[3]>();
+ test_remove_cvref<void(), void ()>();
+
+ test_remove_cvref<int &, int>();
+ test_remove_cvref<const int &, int>();
+ test_remove_cvref<const volatile int &, int>();
+ test_remove_cvref<volatile int &, int>();
+
+ test_remove_cvref<int*, int*>();
+ test_remove_cvref<int(int) const, int(int) const>();
+ test_remove_cvref<int(int) volatile, int(int) volatile>();
+ test_remove_cvref<int(int) &, int(int) &>();
+ test_remove_cvref<int(int) &&, int(int) &&>();
+}
Modified: libcxx/trunk/www/cxx2a_status.html
URL:
http://llvm.org/viewvc/llvm-project/libcxx/trunk/www/cxx2a_status.html?rev=318011&r1=318010&r2=318011&view=diff
==============================================================================
--- libcxx/trunk/www/cxx2a_status.html (original)
+++ libcxx/trunk/www/cxx2a_status.html Sun Nov 12 19:59:22 2017
@@ -64,7 +64,7 @@
<tr><td><a
href="https://wg21.link/P0415R1";>P0415R1</a></td><td>LWG</td><td>Constexpr for
<tt>std::complex</tt></td><td>Albuquerque</td><td></td><td></td></tr>
<tr><td><a
href="https://wg21.link/P0439R0";>P0439R0</a></td><td>LWG</td><td>Make
<tt>std::memory_order</tt> a scoped
enumeration</td><td>Albuquerque</td><td></td><td></td></tr>
<tr><td><a
href="https://wg21.link/P0457R2";>P0457R2</a></td><td>LWG</td><td>String Prefix
and Suffix Checking</td><td>Albuquerque</td><td></td><td></td></tr>
- <tr><td><a
href="https://wg21.link/P0550R2";>P0550R2</a></td><td>LWG</td><td>Transformation
Trait <tt>remove_cvref</tt></td><td>Albuquerque</td><td></td><td></td></tr>
+ <tr><td><a
href="https://wg21.link/P0550R2";>P0550R2</a></td><td>LWG</td><td>Transformation
Trait
<tt>remove_cvref</tt></td><td>Albuquerque</td><td></td><td>Complete</td></tr>
<tr><td><a
href="https://wg21.link/P0600R1";>P0600R1</a></td><td>LWG</td><td>nodiscard in
the Library</td><td>Albuquerque</td><td></td><td></td></tr>
<tr><td><a
href="https://wg21.link/P0616R0";>P0616R0</a></td><td>LWG</td><td>de-pessimize
legacy <numeric> algorithms with
std::move</td><td>Albuquerque</td><td></td><td></td></tr>
<tr><td><a
href="https://wg21.link/P0653R2";>P0653R2</a></td><td>LWG</td><td>Utility to
convert a pointer to a raw
pointer</td><td>Albuquerque</td><td></td><td></td></tr>
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