libstdc++: Change class-key for duration and time_point to class

We define these with the 'struct' keyword, but the standard uses
'class'. This results in warnings if users try to refer to them using
elaborated type specifiers.

libstdc++-v3/ChangeLog:

	* include/bits/chrono.h (duration, time_point): Change 'struct'
	to 'class'.

diff --git a/libstdc++-v3/include/bits/chrono.h b/libstdc++-v3/include/bits/chrono.h
index cabf61264d895d526dab7443c2b57ec1aa6b9096..496e9485a73b5f4782ccacea796de1da1223d537 100644 (file)
--- a/libstdc++-v3/include/bits/chrono.h
+++ b/libstdc++-v3/include/bits/chrono.h
@@ -59,11 +59,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
     /// `chrono::duration` represents a distance between two points in time
     template<typename _Rep, typename _Period = ratio<1>>
-      struct duration;
+      class duration;
 
     /// `chrono::time_point` represents a point in time as measured by a clock
     template<typename _Clock, typename _Dur = typename _Clock::duration>
-      struct time_point;
+      class time_point;
     /// @}
   }
 
@@ -431,14 +431,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     /// @endcond
 
     template<typename _Rep, typename _Period>
-      struct duration
+      class duration
       {
        static_assert(!__is_duration<_Rep>::value, "rep cannot be a duration");
        static_assert(__is_ratio<_Period>::value,
                      "period must be a specialization of ratio");
        static_assert(_Period::num > 0, "period must be positive");
 
-      private:
        template<typename _Rep2>
          using __is_float = treat_as_floating_point<_Rep2>;
 
@@ -844,11 +843,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #undef _GLIBCXX_CHRONO_INT64_T
 
     template<typename _Clock, typename _Dur>
-      struct time_point
+      class time_point
       {
        static_assert(__is_duration<_Dur>::value,
            "duration must be a specialization of std::chrono::duration");
 
+      public:
        typedef _Clock                                          clock;
        typedef _Dur                                            duration;
        typedef typename duration::rep                          rep;