From 8b8bc20f3021dfe4c96c1b0213080844129c0a9f Mon Sep 17 00:00:00 2001
From: Gabi Melman <gmelman1@gmail.com>
Date: Tue, 4 Jul 2023 17:53:04 +0300
Subject: [PATCH] Added const qualifier to bin_hex_formatter to support c++20

---
 include/spdlog/fmt/bin_to_hex.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/spdlog/fmt/bin_to_hex.h b/include/spdlog/fmt/bin_to_hex.h
index 1cb51ce6..3209c1dc 100644
--- a/include/spdlog/fmt/bin_to_hex.h
+++ b/include/spdlog/fmt/bin_to_hex.h
@@ -156,7 +156,7 @@ struct formatter<spdlog::details::dump_info<T>, char>
 
     // format the given bytes range as hex
     template<typename FormatContext, typename Container>
-    auto format(const spdlog::details::dump_info<Container> &the_range, FormatContext &ctx) -> decltype(ctx.out())
+    auto format(const spdlog::details::dump_info<Container> &the_range, FormatContext &ctx) const -> decltype(ctx.out())
     {
         SPDLOG_CONSTEXPR const char *hex_upper = "0123456789ABCDEF";
         SPDLOG_CONSTEXPR const char *hex_lower = "0123456789abcdef";