Title: [156204] trunk/Source/WTF
- Revision
- 156204
- Author
- [email protected]
- Date
- 2013-09-20 14:58:46 -0700 (Fri, 20 Sep 2013)
Log Message
Add an implementation of std::index_sequence from C++14
https://bugs.webkit.org/show_bug.cgi?id=121718
Reviewed by Ryosuke Niwa.
This will make it easier to do things like pack expansion of tuple elements.
* wtf/StdLibExtras.h:
Modified Paths
Diff
Modified: trunk/Source/WTF/ChangeLog (156203 => 156204)
--- trunk/Source/WTF/ChangeLog 2013-09-20 21:56:10 UTC (rev 156203)
+++ trunk/Source/WTF/ChangeLog 2013-09-20 21:58:46 UTC (rev 156204)
@@ -1,3 +1,14 @@
+2013-09-20 Anders Carlsson <[email protected]>
+
+ Add an implementation of std::index_sequence from C++14
+ https://bugs.webkit.org/show_bug.cgi?id=121718
+
+ Reviewed by Ryosuke Niwa.
+
+ This will make it easier to do things like pack expansion of tuple elements.
+
+ * wtf/StdLibExtras.h:
+
2013-09-20 Allan Sandfeld Jensen <[email protected]>
Atomics.h does not build on MinGW
Modified: trunk/Source/WTF/wtf/StdLibExtras.h (156203 => 156204)
--- trunk/Source/WTF/wtf/StdLibExtras.h 2013-09-20 21:56:10 UTC (rev 156203)
+++ trunk/Source/WTF/wtf/StdLibExtras.h 2013-09-20 21:58:46 UTC (rev 156204)
@@ -306,12 +306,8 @@
}
-// For standard libraries that do not yet include it, this adds the std::make_unique
-// type. It is defined in the same namespaces as it would be in library that had the
-// support.
-
+// This adds various C++14 features for versions of the STL that may not yet have them.
namespace std {
-
template<class T> struct _Unique_if {
typedef unique_ptr<T> _Single_object;
};
@@ -362,6 +358,26 @@
make_unique(Args&&...) = delete;
#endif
+#if COMPILER_SUPPORTS(CXX_VARIADIC_TEMPLATES)
+ // Compile-time integer sequences
+ // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3658.html
+ // (Note that we only implement index_sequence, and not the more generic integer_sequence).
+ template<size_t... indexes> struct index_sequence {
+ static size_t size() { return sizeof...(indexes); }
+ };
+
+ template<size_t currentIndex, size_t...indexes> struct make_index_sequence_helper;
+
+ template<size_t...indexes> struct make_index_sequence_helper<0, indexes...> {
+ typedef std::index_sequence<indexes...> type;
+ };
+
+ template<size_t currentIndex, size_t...indexes> struct make_index_sequence_helper {
+ typedef typename make_index_sequence_helper<currentIndex - 1, currentIndex - 1, indexes...>::type type;
+ };
+
+ template<size_t length> struct make_index_sequence : public make_index_sequence_helper<length>::type { };
+#endif
}
using WTF::KB;
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