From 01f34d0b0bfd869196c80026e2d9692a47cfbeeb Mon Sep 17 00:00:00 2001
From: Daniela Engert <dani@ngrt.de>
Date: Wed, 6 Feb 2019 08:37:03 +0100
Subject: [PATCH] Fix library deprecation warning

Since C++17, using template specialization 'std::allocator<void>' in any shape or form (even just mentioning it) is deprecated! A simple workaround is replacing 'void' by another (preferably empty) type, e.g. 'fmt::monostate'.

Found by Clang 9 in Visual Studio.
---
 test/prepare-test.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/prepare-test.cc b/test/prepare-test.cc
index 647db5db..e40b6b45 100644
--- a/test/prepare-test.cc
+++ b/test/prepare-test.cc
@@ -618,8 +618,9 @@ template <typename T> struct user_allocator {
   ~user_allocator() = default;
   template <typename U> user_allocator(const user_allocator<U>&) {}
 
-  pointer allocate(size_type cnt,
-                   typename std::allocator<void>::const_pointer = FMT_NULL) {
+  pointer allocate(
+      size_type cnt,
+      typename std::allocator<fmt::monostate>::const_pointer = FMT_NULL) {
     return new value_type[cnt];
   }