Replace custom type traits with std one's

Remove most type traits from qtypetraits.h, but keep the custom
implementation of is_signed/is_unsigned. This gets rid of
BSD-3 licensed code from Google in a public header (hugh!).

The custom implementations for is_signed/is_unsigned are kept
because the implementations in gcc's standard headers do not
work as we expect for enums - both is_signed and is_unsigned
always returns false there - see also
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59027

[ChangeLog][QtCore][General] Qt now relies on type traits from
the C++ standard library.

Change-Id: I3f2188b46949f04ca4482a6ac9afd3482103f0e1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp b/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
index 1a70ac5e75..0c890eafbc 100644
--- a/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
+++ b/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
@@ -29,7 +29,6 @@
 #include <QtTest/QtTest>
 
 #include <qhash.h>
-#include <qtypetraits.h>
 
 #include <iterator>
 #include <sstream>
@@ -197,7 +196,7 @@ void tst_QHashFunctions::range()
     {
         // verify that the input iterator category suffices:
         std::stringstream sstream;
-        Q_STATIC_ASSERT((QtPrivate::is_same<std::input_iterator_tag, std::istream_iterator<int>::iterator_category>::value));
+        Q_STATIC_ASSERT((std::is_same<std::input_iterator_tag, std::istream_iterator<int>::iterator_category>::value));
         std::copy(ints, ints + numInts, std::ostream_iterator<int>(sstream, " "));
         sstream.seekg(0);
         std::istream_iterator<int> it(sstream), end;