From c2429a818183ce6efa9812ceed71b4d305276591 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20DELRIEU?= <theo.delrieu@tanker.io>
Date: Fri, 19 Feb 2021 09:19:27 +0100
Subject: [PATCH] allow ascii symbols_parser to be matched against unicode
 chars

---
 include/boost/spirit/home/x3/support/no_case.hpp |  8 ++++----
 test/x3/symbols3.cpp                             | 10 ++++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/include/boost/spirit/home/x3/support/no_case.hpp b/include/boost/spirit/home/x3/support/no_case.hpp
index 48c06d6f34..7d772d4727 100644
--- a/include/boost/spirit/home/x3/support/no_case.hpp
+++ b/include/boost/spirit/home/x3/support/no_case.hpp
@@ -24,8 +24,8 @@ namespace boost { namespace spirit { namespace x3
             return set.test(ch);
         }
 
-        template <typename Char>
-        int32_t operator()(Char lc, Char rc) const
+        template <typename Char, typename Char2>
+        int32_t operator()(Char lc, Char2 rc) const
         {
             return lc - rc;
         }
@@ -50,8 +50,8 @@ namespace boost { namespace spirit { namespace x3
                     ? Encoding::toupper(ch) : Encoding::tolower(ch));
         }
 
-        template <typename Char>
-        int32_t operator()(Char lc_, Char const rc_) const
+        template <typename Char, typename Char2>
+        int32_t operator()(Char lc_, Char2 const rc_) const
         {
             using char_type = typename Encoding::classify_type;
             auto lc = char_type(lc_);
diff --git a/test/x3/symbols3.cpp b/test/x3/symbols3.cpp
index bace674dc6..07d6b27229 100644
--- a/test/x3/symbols3.cpp
+++ b/test/x3/symbols3.cpp
@@ -93,5 +93,15 @@ main()
         BOOST_TEST(r == 3);
     }
 
+    { // unicode input | ascii symbols
+        using namespace boost::spirit;
+        symbols<int> foo = {{"a1", 1}, {"a2", 2}, {"a3", 3}};
+
+        int r;
+        BOOST_TEST((test_attr(U"a3", foo, r)));
+        std::cout << "r = " <<r << std::endl;
+        BOOST_TEST(r == 3);
+    }
+
     return boost::report_errors();
 }