Reversed order of arguments to clock_time_conversion.

Now the order of argument matches the clock_cast function.
The test only is_clock_castable trait still matches is_convertible
order of arguments.

include/date/tz.h

@@ -1839,7 +1839,7 @@ public:
     static time_point now();
 
     template<typename Duration>
-    static 
+    static
     std::chrono::time_point<std::chrono::system_clock, typename std::common_type<Duration, std::chrono::seconds>::type>
     to_sys(const std::chrono::time_point<utc_clock, Duration>&);
 
@@ -1990,7 +1990,7 @@ public:
     static time_point now() NOEXCEPT;
 
     template<typename Duration>
-    static 
+    static
     std::chrono::time_point<utc_clock, typename std::common_type<Duration, std::chrono::seconds>::type>
     to_utc(const std::chrono::time_point<tai_clock, Duration>&) NOEXCEPT;
 
@@ -2100,7 +2100,7 @@ public:
     static time_point now() NOEXCEPT;
 
     template<typename Duration>
-    static 
+    static
     std::chrono::time_point<utc_clock, typename std::common_type<Duration, std::chrono::seconds>::type>
     to_utc(const std::chrono::time_point<gps_clock, Duration>&) NOEXCEPT;
 
@@ -2197,7 +2197,7 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
     return is;
 }
 
-template<typename SourceClock, typename DestClock>
+template<typename DestClock, typename SourceClock>
 struct clock_time_conversion
 {};
 
@@ -2207,7 +2207,7 @@ struct clock_time_conversion<std::chrono::system_clock, std::chrono::system_cloc
   template <class Duration>
   auto operator()(const sys_time<Duration>& st) const
     -> sys_time<Duration>
-  { 
+  {
     return st;
   }
 };
@@ -2218,13 +2218,13 @@ struct clock_time_conversion<utc_clock, utc_clock>
   template <class Duration>
   auto operator()(const utc_time<Duration>& ut) const
     -> utc_time<Duration>
-  { 
+  {
     return ut;
   }
 };
 
 template<>
-struct clock_time_conversion<std::chrono::system_clock, utc_clock>
+struct clock_time_conversion<utc_clock, std::chrono::system_clock>
 {
   template <class Duration>
   utc_time<typename std::common_type<Duration, std::chrono::seconds>::type>
@@ -2235,7 +2235,7 @@ struct clock_time_conversion<std::chrono::system_clock, utc_clock>
 };
 
 template<>
-struct clock_time_conversion<utc_clock, std::chrono::system_clock>
+struct clock_time_conversion<std::chrono::system_clock, utc_clock>
 {
   template <class Duration>
   sys_time<typename std::common_type<Duration, std::chrono::seconds>::type>
@@ -2251,14 +2251,14 @@ struct clock_time_conversion<Clock, Clock>
   template <class Duration>
   auto operator()(const std::chrono::time_point<Clock, Duration>& tp) const
     -> std::chrono::time_point<Clock, Duration>
-  { 
+  {
     return tp;
   }
 };
 
 namespace ctc_detail
 {
-  //Check if TimePoint is time for given clock, 
+  //Check if TimePoint is time for given clock,
   //if not emits hard error
   template<typename Clock, typename TimePoint>
   struct return_clock_time
@@ -2271,7 +2271,7 @@ namespace ctc_detail
   // Check if Clock has to_sys method accepting TimePoint with given duration const& and returning sys_time
   // If so has nested type member equal to return type to_sys.
   template<typename Clock, typename Duration, typename = void>
-  struct return_to_sys 
+  struct return_to_sys
   {};
 
   template<typename Clock, typename Duration>
@@ -2281,7 +2281,7 @@ namespace ctc_detail
 
   // Similiar to above
   template<typename Clock, typename Duration, typename = void>
-  struct return_from_sys 
+  struct return_from_sys
   {};
 
   template<typename Clock, typename Duration>
@@ -2291,7 +2291,7 @@ namespace ctc_detail
 
   // Similiar to above
   template<typename Clock, typename Duration, typename = void>
-  struct return_to_utc 
+  struct return_to_utc
   {};
 
   template<typename Clock, typename Duration>
@@ -2301,7 +2301,7 @@ namespace ctc_detail
 
   // Similiar to above
   template<typename Clock, typename Duration, typename = void>
-  struct return_from_utc 
+  struct return_from_utc
   {};
 
   template<typename Clock, typename Duration>
@@ -2311,7 +2311,7 @@ namespace ctc_detail
 }
 
 template<typename SourceClock>
-struct clock_time_conversion<SourceClock, std::chrono::system_clock> 
+struct clock_time_conversion<std::chrono::system_clock, SourceClock>
 {
   template <class Duration>
   auto operator()(const std::chrono::time_point<SourceClock, Duration>& tp) const
@@ -2322,7 +2322,7 @@ struct clock_time_conversion<SourceClock, std::chrono::system_clock>
 };
 
 template<typename DestClock>
-struct clock_time_conversion<std::chrono::system_clock, DestClock>
+struct clock_time_conversion<DestClock, std::chrono::system_clock>
 {
   template <class Duration>
   auto operator()(const sys_time<Duration>& st) const
@@ -2333,7 +2333,7 @@ struct clock_time_conversion<std::chrono::system_clock, DestClock>
 };
 
 template<typename SourceClock>
-struct clock_time_conversion<SourceClock, utc_clock> 
+struct clock_time_conversion<utc_clock, SourceClock>
 {
   template <class Duration>
   auto operator()(const std::chrono::time_point<SourceClock, Duration>& tp) const
@@ -2344,7 +2344,7 @@ struct clock_time_conversion<SourceClock, utc_clock>
 };
 
 template<typename DestClock>
-struct clock_time_conversion<utc_clock, DestClock>
+struct clock_time_conversion<DestClock, utc_clock>
 {
   template <class Duration>
   auto operator()(const utc_time<Duration>& ut) const
@@ -2358,12 +2358,12 @@ namespace clock_cast_detail
 {
    template<typename DestClock, typename SourceClock, typename Duration>
    auto conv_clock(const std::chrono::time_point<SourceClock, Duration>& st)
-     -> decltype(std::declval<clock_time_conversion<SourceClock, DestClock>>()(st))
+     -> decltype(std::declval<clock_time_conversion<DestClock, SourceClock>>()(st))
    {
-     return clock_time_conversion<SourceClock, DestClock>{}(st);
+     return clock_time_conversion<DestClock, SourceClock>{}(st);
    }
 
-   //direct triat conversion, 2nd candidate 
+   //direct triat conversion, 2nd candidate
    template<typename DestClock, typename SourceClock, typename Duration>
    auto cc_impl(const std::chrono::time_point<SourceClock, Duration>& st,
                 const std::chrono::time_point<SourceClock, Duration>* /* 1st */)
@@ -2412,8 +2412,8 @@ namespace clock_cast_detail
 template<typename DestClock, typename SourceClock, typename Duration>
 auto clock_cast(const std::chrono::time_point<SourceClock, Duration>& st)
  -> decltype(clock_cast_detail::cc_impl<DestClock>(st, &st))
-{ 
-  return clock_cast_detail::cc_impl<DestClock>(st, &st); 
+{
+  return clock_cast_detail::cc_impl<DestClock>(st, &st);
 }
 
 // Deprecated API

test/clock_cast_test/custom_clock.pass.cpp

@@ -39,7 +39,7 @@ struct mil_clock
 
   template<typename Duration>
   static
-  std::chrono::time_point<std::chrono::system_clock, std::common_type_t<Duration, date::days>> 
+  std::chrono::time_point<std::chrono::system_clock, std::common_type_t<Duration, date::days>>
   to_sys(std::chrono::time_point<mil_clock, Duration> const& tp)
   {
     ++conversions;
@@ -66,7 +66,7 @@ struct mil_clock
 date::sys_days const mil_clock::epoch;
 
 // traits example
-struct s2s_clock 
+struct s2s_clock
 {
   using duration = std::chrono::system_clock::duration;
   using rep = duration::rep;
@@ -75,7 +75,7 @@ struct s2s_clock
 
   template<typename Duration>
   static
-  std::chrono::time_point<std::chrono::system_clock, Duration> 
+  std::chrono::time_point<std::chrono::system_clock, Duration>
   to_sys(std::chrono::time_point<s2s_clock, Duration> const& tp)
   {
     ++conversions;
@@ -84,7 +84,7 @@ struct s2s_clock
 
   template<typename Duration>
   static
-  std::chrono::time_point<s2s_clock, Duration> 
+  std::chrono::time_point<s2s_clock, Duration>
   from_sys(std::chrono::time_point<std::chrono::system_clock, Duration> const& tp)
   {
     ++conversions;
@@ -100,7 +100,7 @@ struct s2s_clock
 namespace date
 {
    template<>
-   struct clock_time_conversion<s2s_clock, mil_clock>
+   struct clock_time_conversion<mil_clock, s2s_clock>
    {
      template<typename Duration>
      std::chrono::time_point<mil_clock, std::common_type_t<Duration, date::days>>
@@ -123,7 +123,7 @@ main()
     {
        sys_days st(1997_y/dec/12);
        auto mt = mil_clock::from_sys(st);
-       
+
        assert(clock_cast<mil_clock>(mt) == mt);
     }
 
@@ -133,7 +133,7 @@ main()
        auto mt = mil_clock::from_sys(st);
 
        assert(clock_cast<mil_clock>(st) == mt);
-       assert(clock_cast<sys_clock>(mt) == st);      
+       assert(clock_cast<sys_clock>(mt) == st);
     }
 
     // mil <-> utc
@@ -143,7 +143,7 @@ main()
        auto ut = utc_clock::from_sys(st);
 
        assert(clock_cast<mil_clock>(ut) == mt);
-       assert(clock_cast<utc_clock>(mt) == ut);      
+       assert(clock_cast<utc_clock>(mt) == ut);
     }
 
     // mil <-> tai
@@ -179,7 +179,7 @@ main()
        assert(clock_cast<mil_clock>(s2t) == mt);
        assert(conversions == 1);
 
-       //uses sys_clock       
+       //uses sys_clock
        conversions = 0;
        assert(clock_cast<s2s_clock>(mt) == s2t);
        assert(conversions == 2);

test/clock_cast_test/deprecated.pass.cpp

@@ -34,7 +34,7 @@ main()
        auto ut = utc_clock::from_sys(st);
 
        assert(to_utc_time(st) == ut);
-       assert(to_sys_time(ut) == st);      
+       assert(to_sys_time(ut) == st);
     }
 
     // tai <-> utc
@@ -77,7 +77,7 @@ main()
        assert(to_sys_time(gt) == st);
     }
 
-    // tai <-> gps   
+    // tai <-> gps
     {
        sys_days st(1997_y/dec/12);
        auto ut = utc_clock::from_sys(st);

test/clock_cast_test/noncastable.pass.cpp

@@ -25,7 +25,7 @@
 #include <cassert>
 
 template<typename SourceClock, typename DestClock, typename = void>
-struct is_clock_castable 
+struct is_clock_castable
   : std::false_type
 {};
 
@@ -36,7 +36,7 @@ struct is_clock_castable<SourceClock, DestClock, decltype(date::clock_cast<DestC
 
 
 //Clock based on steady clock, not related to wall time (sys_clock/utc_clock)
-struct steady_based_clock 
+struct steady_based_clock
 {
   using duration = std::chrono::steady_clock::duration;
   using rep = duration::rep;
@@ -54,7 +54,7 @@ struct steady_based_clock
 namespace date
 {
    template<>
-   struct clock_time_conversion<steady_based_clock, std::chrono::steady_clock>
+   struct clock_time_conversion<std::chrono::steady_clock, steady_based_clock>
    {
      template<typename Duration>
      std::chrono::time_point<std::chrono::steady_clock, Duration>
@@ -66,7 +66,7 @@ namespace date
    };
 
    template<>
-   struct clock_time_conversion<std::chrono::steady_clock, steady_based_clock>
+   struct clock_time_conversion<steady_based_clock, std::chrono::steady_clock>
    {
      template<typename Duration>
      std::chrono::time_point<steady_based_clock, Duration>
@@ -78,7 +78,7 @@ namespace date
    };
 }
 
-//Ambigous clocks both providing to/from_sys and to/from_utc 
+//Ambigous clocks both providing to/from_sys and to/from_utc
 //They are mock_ups just returning zero time_point
 struct amb1_clock
 {
@@ -87,7 +87,7 @@ struct amb1_clock
    using period = duration::period;
    using time_point = std::chrono::time_point<amb1_clock>;
 
-   static time_point now() 
+   static time_point now()
    {
      return {};
    }
@@ -132,7 +132,7 @@ struct amb2_clock
    using period = duration::period;
    using time_point = std::chrono::time_point<amb2_clock>;
 
-   static time_point now() 
+   static time_point now()
    {
      return {};
    }
@@ -174,7 +174,7 @@ namespace date
 {
    //Disambiguates that sys_clock is preffered
    template<>
-   struct clock_time_conversion<amb2_clock, amb1_clock>
+   struct clock_time_conversion<amb1_clock, amb2_clock>
    {
      template<typename Duration>
      std::chrono::time_point<amb1_clock, Duration>
@@ -214,7 +214,7 @@ main()
     {
       auto s1 = steady_clock::time_point(steady_clock::duration(200));
       auto s2 = steady_based_clock::time_point(steady_based_clock::duration(200));
-   
+
       assert(clock_cast<steady_based_clock>(s1) == s2);
       assert(clock_cast<steady_clock>(s2) == s1);
     }

test/clock_cast_test/normal_clocks.pass.cpp

@@ -34,7 +34,7 @@ main()
        sys_days st(1997_y/dec/12);
        auto ut = utc_clock::from_sys(st);
        auto tt = tai_clock::from_utc(ut);
-       
+
        assert(clock_cast<sys_clock>(st) == st);
        assert(clock_cast<utc_clock>(ut) == ut);
        assert(clock_cast<tai_clock>(tt) == tt);
@@ -46,7 +46,7 @@ main()
        auto ut = utc_clock::from_sys(st);
 
        assert(clock_cast<utc_clock>(st) == ut);
-       assert(clock_cast<sys_clock>(ut) == st);      
+       assert(clock_cast<sys_clock>(ut) == st);
     }
 
     // tai <-> utc
@@ -89,7 +89,7 @@ main()
        assert(clock_cast<sys_clock>(gt) == st);
     }
 
-    // tai <-> gps   
+    // tai <-> gps
     {
        sys_days st(1997_y/dec/12);
        auto ut = utc_clock::from_sys(st);

test/clock_cast_test/to_sys_return_int.fail.cpp

@@ -22,7 +22,7 @@
 
 #include "tz.h"
 
-struct bad_clock 
+struct bad_clock
 {
   using duration = std::chrono::system_clock::duration;
   using rep = duration::rep;
@@ -31,7 +31,7 @@ struct bad_clock
 
   template<typename Duration>
   static
-  int 
+  int
   to_sys(std::chrono::time_point<bad_clock, Duration> const& tp)
   {
     return tp.time_since_epoch().count();

test/clock_cast_test/to_sys_return_reference.fail.cpp

@@ -22,7 +22,7 @@
 
 #include "tz.h"
 
-struct bad_clock 
+struct bad_clock
 {
   using duration = std::chrono::system_clock::duration;
   using rep = duration::rep;

test/clock_cast_test/to_sys_return_utc_time.fail.cpp

@@ -22,7 +22,7 @@
 
 #include "tz.h"
 
-struct bad_clock 
+struct bad_clock
 {
   using duration = std::chrono::system_clock::duration;
   using rep = duration::rep;
@@ -31,7 +31,7 @@ struct bad_clock
 
   template<typename Duration>
   static
-  date::utc_time<Duration> 
+  date::utc_time<Duration>
   to_sys(std::chrono::time_point<bad_clock, Duration> const& tp)
   {
     return utc_time<Duration>(tp.time_since_epoch());