From 7b51bc95d9cf0d9a2e91a37319fa34e4e5f26927 Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Wed, 6 Jul 2022 12:58:15 +0200
Subject: [PATCH] [cplusplus] Fix build on GCC < 7

[Retrieved from:
https://github.com/harfbuzz/harfbuzz/commit/7b51bc95d9cf0d9a2e91a37319fa34e4e5f26927]
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
 src/hb-cplusplus.hh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/hb-cplusplus.hh b/src/hb-cplusplus.hh
index 86d0452080..f06a32d912 100644
--- a/src/hb-cplusplus.hh
+++ b/src/hb-cplusplus.hh
@@ -166,8 +166,14 @@ HB_DEFINE_VTABLE (unicode_funcs);
 
 } // namespace hb
 
+/* Workaround for GCC < 7, see:
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480
+ * https://stackoverflow.com/a/25594741 */
+namespace std {
+
+
 template<typename T>
-struct std::hash<hb::shared_ptr<T>>
+struct hash<hb::shared_ptr<T>>
 {
     std::size_t operator()(const hb::shared_ptr<T>& v) const noexcept
     {
@@ -177,7 +183,7 @@ struct std::hash<hb::shared_ptr<T>>
 };
 
 template<typename T>
-struct std::hash<hb::unique_ptr<T>>
+struct hash<hb::unique_ptr<T>>
 {
     std::size_t operator()(const hb::unique_ptr<T>& v) const noexcept
     {
@@ -187,6 +193,8 @@ struct std::hash<hb::unique_ptr<T>>
 };
 
 
+} // namespace std
+
 #endif /* __cplusplus */
 
 #endif /* HB_CPLUSPLUS_HH */