From 4eb7c3210fc04b8fc92d99b6dfe5323596c63593 Mon Sep 17 00:00:00 2001
From: Danil Sidoruk <danilsidoruknv@yandex.ru>
Date: Thu, 12 Sep 2024 21:09:41 +0300
Subject: [PATCH] Implement std::hash for boost::fibers::context::id

---
 include/boost/fiber/context.hpp | 12 ++++++++++++
 src/context.cpp                 | 10 ++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/boost/fiber/context.hpp b/include/boost/fiber/context.hpp
index 8a96c4cc..82d84840 100644
--- a/include/boost/fiber/context.hpp
+++ b/include/boost/fiber/context.hpp
@@ -174,6 +174,7 @@ private:
 public:
     class id {
     private:
+        friend std::hash<id>;
         context  *   impl_{ nullptr };
 
     public:
@@ -520,6 +521,17 @@ static intrusive_ptr< context > make_worker_context( launch policy,
 
 }}
 
+// std::hash specialization
+namespace std {
+
+template <>
+struct hash< ::boost::fibers::context::id > {
+    std::size_t
+    operator() ( ::boost::fibers::context::id const& id ) const noexcept;
+};
+
+}
+
 #ifdef _MSC_VER
 # pragma warning(pop)
 #endif
diff --git a/src/context.cpp b/src/context.cpp
index 4f9eabc3..97a45a50 100644
--- a/src/context.cpp
+++ b/src/context.cpp
@@ -434,6 +434,16 @@ context::attach( context * ctx) noexcept {
 
 }}
 
+namespace std {
+
+std::size_t
+hash< ::boost::fibers::context::id >::operator() ( ::boost::fibers::context::id const& id ) const noexcept {
+    return reinterpret_cast<std::size_t>(id.impl_);
+}
+
+}
+
+
 #ifdef BOOST_HAS_ABI_HEADERS
 #  include BOOST_ABI_SUFFIX
 #endif