Support comparing tuples in localized_compare

CleverRaven · May 5, 2020 · 5a3880c · 5a3880c
1 parent 8591e64
commit 5a3880c
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/src/translations.h b/src/translations.h
@@ -7,6 +7,7 @@
 #include <string>
 #include <vector>
 #include <type_traits>
+#include <utility>
 
 #include "optional.h"
 
@@ -263,13 +264,31 @@ struct localized_comparator {
         return ( *this )( l.second, r.second );
     }
 
+    template<typename Head, typename... Tail>
+    bool operator()( const std::tuple<Head, Tail...> &l,
+                     const std::tuple<Head, Tail...> &r ) const {
+        if( ( *this )( std::get<0>( l ), std::get<0>( r ) ) ) {
+            return true;
+        }
+        if( ( *this )( std::get<0>( r ), std::get<0>( l ) ) ) {
+            return false;
+        }
+        constexpr std::make_index_sequence<sizeof...( Tail )> Ints{};
+        return ( *this )( tie_tail( l, Ints ), tie_tail( r, Ints ) );
+    }
+
     template<typename T>
     bool operator()( const T &l, const T &r ) const {
         return l < r;
     }
 
     bool operator()( const std::string &, const std::string & ) const;
     bool operator()( const std::wstring &, const std::wstring & ) const;
+
+    template<typename Head, typename... Tail, size_t... Ints>
+    auto tie_tail( const std::tuple<Head, Tail...> &t, std::index_sequence<Ints...> ) const {
+        return std::tie( std::get < Ints + 1 > ( t )... );
+    }
 };
 
 constexpr localized_comparator localized_compare{};