On 11 August 2016 at 21:05, Ville Voutilainen
<ville.voutilai...@gmail.com> wrote:
>> The latest SD-6 has a feature test macro;
>>
>> #define __cpp_lib_make_from_tuple 201606
>>
>>
>> Also the test should get:
>>
>> #ifndef __cpp_lib_make_from_tuple
>> # error "Feature-test macro for make_from_tuple missing"
>> #elif __cpp_lib_make_from_tuple != 201606
>> # error "Feature-test macro for make_from_tuple has wrong value"
>> #endif
>
>
> Thanks, I tried to find a recent SD-6 when looking for a feature macro
> for make_from_tuple, but couldn't find one.
> I was not looking in the right place. :)
Here. Tested on Linux-x64. I made the test for the macro value compare
it relatively rather than exactly;
I don't think our tests should necessarily break just because a macro
value is updated.
2016-08-14 Ville Voutilainen <ville.voutilai...@gmail.com>
Add a feature macro for C++17 make_from_tuple.
* include/std/tuple (__cpp_lib_make_from_tuple): New.
* testsuite/20_util/tuple/make_from_tuple/1.cc: Adjust.
diff --git a/libstdc++-v3/include/std/tuple b/libstdc++-v3/include/std/tuple
index 3403048..5ad171f 100644
--- a/libstdc++-v3/include/std/tuple
+++ b/libstdc++-v3/include/std/tuple
@@ -1656,6 +1656,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Indices{});
}
+#define __cpp_lib_make_from_tuple 201606
+
template <typename _Tp, typename _Tuple, size_t... _Idx>
constexpr _Tp
__make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>)
diff --git a/libstdc++-v3/testsuite/20_util/tuple/make_from_tuple/1.cc
b/libstdc++-v3/testsuite/20_util/tuple/make_from_tuple/1.cc
index 459dc74..17aca31 100644
--- a/libstdc++-v3/testsuite/20_util/tuple/make_from_tuple/1.cc
+++ b/libstdc++-v3/testsuite/20_util/tuple/make_from_tuple/1.cc
@@ -20,6 +20,12 @@
#include <tuple>
#include <testsuite_hooks.h>
+#ifndef __cpp_lib_make_from_tuple
+# error "Feature-test macro for make_from_tuple missing."
+#elif __cpp_lib_make_from_tuple < 201606
+# error "Feature-test macro for make_from_tuple has the wrong value."
+#endif
+
template <class T, class U, class V>
struct ThreeParam
{
