Replace the type-based QAtomicIntegerTraits with a size-based one

This simplifies the code a lot and avoids silly mistakes where a
specific integer type is missing (such as char16_t).

Change-Id: Id91dfd1919e783e0a9af7bfa093ca560a01b22d1
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 2 insertions, 14 deletions

diff --git a/src/corelib/thread/qgenericatomic.h b/src/corelib/thread/qgenericatomic.h
index bbdc57ca50..eacde411b9 100644
--- a/src/corelib/thread/qgenericatomic.h
+++ b/src/corelib/thread/qgenericatomic.h
@@ -60,20 +60,8 @@ QT_END_NAMESPACE
 #define always_inline
 #endif
 
-template<typename T> struct QAtomicIntegerTraits { enum { IsInteger = 0 }; };
-
-// these integers are always supported, on all platforms
-//  - int, unsigned int and char32_t are 32-bit wide
-//  - long and unsigned long might be 64-bit wide on 64-bit platforms,
-//    but 64-bit integer support is required anyway
-template<> struct QAtomicIntegerTraits<int> { enum { IsInteger = 1 }; };
-template<> struct QAtomicIntegerTraits<unsigned int> { enum { IsInteger = 1 }; };
-template<> struct QAtomicIntegerTraits<long> { enum { IsInteger = 1 }; };
-template<> struct QAtomicIntegerTraits<unsigned long> { enum { IsInteger = 1 }; };
-#ifdef Q_COMPILER_UNICODE_STRINGS
-template<> struct QAtomicIntegerTraits<char32_t>
-{ enum { IsInteger = sizeof(char32_t) == sizeof(int) ? 1 : -1 }; };
-#endif
+template<int> struct QAtomicOpsSupport { enum { IsSupported = 0 }; };
+template<> struct QAtomicOpsSupport<4> { enum { IsSupported = 1 }; };
 
 template <typename T> struct QAtomicAdditiveType
 {