From 92add2afa6bdfdd48f87a224f41633efe6fa88b2 Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Thu, 14 Feb 2019 16:16:04 -0800
Subject: [PATCH] bind_front_handler works with member functions

---
 CHANGELOG.md                                     |  1 +
 include/boost/beast/core/detail/bind_handler.hpp | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6fa3cec3..02c55cd2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@ Version 215:
 
 * basic_stream uses boost::shared_ptr
 * Remove bind_back_handler
+* bind_front_handler works with member functions
 
 --------------------------------------------------------------------------------
 
diff --git a/include/boost/beast/core/detail/bind_handler.hpp b/include/boost/beast/core/detail/bind_handler.hpp
index 915688cd..b6a490ab 100644
--- a/include/boost/beast/core/detail/bind_handler.hpp
+++ b/include/boost/beast/core/detail/bind_handler.hpp
@@ -217,6 +217,7 @@ class bind_front_wrapper
     template<std::size_t... I, class... Ts>
     void
     invoke(
+        std::false_type,
         mp11::index_sequence<I...>,
         Ts&&... ts)
     {
@@ -224,6 +225,18 @@ class bind_front_wrapper
             std::forward<Ts>(ts)...);
     }
 
+    template<std::size_t... I, class... Ts>
+    void
+    invoke(
+        std::true_type,
+        mp11::index_sequence<I...>,
+        Ts&&... ts)
+    {
+        std::mem_fn(h_)(
+            detail::get<I>(std::move(args_))...,
+            std::forward<Ts>(ts)...);
+    }
+
 public:
     using result_type = void; // asio needs this
 
@@ -243,6 +256,7 @@ public:
     void operator()(Ts&&... ts)
     {
         invoke(
+            std::is_member_function_pointer<Handler>{},
             mp11::index_sequence_for<Args...>{},
             std::forward<Ts>(ts)...);
     }