From eba984303c3d7b4c48a9e4c85fee4f41198d886d Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Wed, 25 Dec 2019 14:12:17 -0500
Subject: [PATCH] TranslatableString::Format is aware of std::reference_wrapper

---
 include/audacity/Types.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/audacity/Types.h b/include/audacity/Types.h
index 4a9319566..144773533 100644
--- a/include/audacity/Types.h
+++ b/include/audacity/Types.h
@@ -501,6 +501,13 @@ private:
 
    template< typename T > static const T &TranslateArgument( const T &arg, bool )
    { return arg; }
+   // This allows you to wrap arguments of Format in std::cref so that they
+   // are captured (as if) by reference rather than by value
+   template< typename T > static auto TranslateArgument(
+      const std::reference_wrapper<T> &arg, bool debug )
+         -> decltype(
+            TranslatableString::TranslateArgument( arg.get(), debug ) )
+   { return TranslatableString::TranslateArgument( arg.get(), debug ); }
    static wxString TranslateArgument( const TranslatableString &arg, bool debug )
    { return arg.DoFormat( debug ); }