This patch removes the __formatter_chrono<_CharT> base class from the
formatters for utc_time, gps_time, and tai_time. These formatters
are using the __formatter_duration<_CharT> member only.

libstdc++-v3/ChangeLog:

        * include/bits/chrono_io.h (formatter<chrono::utc_time, _CharT>):
        (formatter<chrono::gps_time<_Duration>, _CharT>)
        (formatter<chrono::tai_time<_Duration>, _CharT): Remove
        __formatter_chrono base class.

Reviewed-by: Jonathan Wakely <[email protected]>
Signed-off-by: Tomasz Kamiński <[email protected]>
---
 libstdc++-v3/include/bits/chrono_io.h | 3 ---
 1 file changed, 3 deletions(-)

v2 fixes type and rewords the commit message.
Pushed to trunk. Tested on x86_64-linux.

diff --git a/libstdc++-v3/include/bits/chrono_io.h 
b/libstdc++-v3/include/bits/chrono_io.h
index ff7e8cfe6b9..85b2013cf70 100644
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -2958,7 +2958,6 @@ namespace __format
 
   template<typename _Duration, __format::__char _CharT>
     struct formatter<chrono::utc_time<_Duration>, _CharT>
-    : __format::__formatter_chrono<_CharT>
     {
       constexpr typename basic_format_parse_context<_CharT>::iterator
       parse(basic_format_parse_context<_CharT>& __pc)
@@ -3003,7 +3002,6 @@ namespace __format
 
   template<typename _Duration, __format::__char _CharT>
     struct formatter<chrono::tai_time<_Duration>, _CharT>
-    : __format::__formatter_chrono<_CharT>
     {
       constexpr typename basic_format_parse_context<_CharT>::iterator
       parse(basic_format_parse_context<_CharT>& __pc)
@@ -3039,7 +3037,6 @@ namespace __format
 
   template<typename _Duration, __format::__char _CharT>
     struct formatter<chrono::gps_time<_Duration>, _CharT>
-    : __format::__formatter_chrono<_CharT>
     {
       constexpr typename basic_format_parse_context<_CharT>::iterator
       parse(basic_format_parse_context<_CharT>& __pc)
-- 
2.51.0

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