bind_front_handler works with member functions

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
 
 --------------------------------------------------------------------------------
 

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)...);
     }