ensure compatibility for client_kill for g++ 4.8

Author: YiuRULE

includes/cpp_redis/future_client.hpp

@@ -94,7 +94,7 @@ class future_client {
   future brpop(const std::vector<std::string>& keys, int timeout);
   future brpoplpush(const std::string& src, const std::string& dst, int timeout);
   template <typename T, typename... Ts>
-  future client_kill(const T&, const Ts&...);
+  future client_kill(const T, const Ts...);
   future client_list();
   future client_getname();
   future client_pause(int timeout);
@@ -309,8 +309,15 @@ class future_client {
 
 template <typename T, typename... Ts>
 future_client::future
-future_client::client_kill(const T& arg, const Ts&... args) {
-  return exec_cmd([=](const rcb_t& cb) -> rc& { return m_client.client_kill(arg, args..., cb); });
+future_client::client_kill(const T arg, const Ts... args) {
+
+  /** gcc 4.8 doesn't handle variadic template capture arguments (appears in 4.9), so std::bind should capture all arguments
+   *  because of the compiler.
+   */
+  return exec_cmd(std::bind([this](T arg, Ts... args, const rcb_t& cb) -> rc& {
+    return m_client.client_kill(arg, args..., cb);
+  },
+    arg, args..., std::placeholders::_1));
 }
 
 } //! cpp_redis