From 37899b3f8bd9aaedc4c3499ea4d4774a1d4f3381 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 17 Feb 2020 14:30:30 +1100
Subject: [PATCH] view: prefer allocator_traits over allocator for pointer

allocator::pointer has been removed in c++20, so we need to be using
allocator_traits::pointer here instead.
---
 view.hpp | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/view.hpp b/view.hpp
index 69d2e253..4c8d96a5 100644
--- a/view.hpp
+++ b/view.hpp
@@ -528,18 +528,32 @@ namespace cruft {
 
 
     template <typename CharT, typename Traits, typename Allocator>
-    view (std::basic_string<CharT,Traits,Allocator> &) -> view<typename Allocator::pointer>;
+    view (
+        std::basic_string<CharT,Traits,Allocator> &
+    ) -> view<
+        typename std::allocator_traits<Allocator>::pointer
+    >;
 
 
     template <typename CharT, typename Traits, typename Allocator>
-    view (const std::basic_string<CharT,Traits,Allocator> &) -> view<typename Allocator::const_pointer>;
+    view (
+        const std::basic_string<CharT,Traits,Allocator> &
+    ) -> view<
+        typename std::allocator_traits<Allocator>::const_pointer
+    >;
 
     template <typename ValueT, typename AllocatorT>
-    view (std::vector<ValueT,AllocatorT>&) -> view<typename AllocatorT::pointer>;
+    view (
+        std::vector<ValueT,AllocatorT>&
+    ) -> view<typename std::allocator_traits<AllocatorT>::pointer>;
 
 
     template <typename ValueT, typename AllocatorT>
-    view (const std::vector<ValueT,AllocatorT>&) -> view<typename AllocatorT::const_pointer>;
+    view (
+        const std::vector<ValueT,AllocatorT>&
+    ) -> view<
+        typename std::allocator_traits<AllocatorT>::const_pointer
+    >;
 
     template <typename ValueT, std::size_t N>
     view (std::array<ValueT,N>&) -> view<ValueT*>;