Fix unused parameter warnings and missing includes:

fix #127

* Added beast::detail::ignore_unused based on boost::ignore_unused
* Added -Wextra compilation flag when building with gcc
* Fixed all unused parameter warnings with ignore_unused
* Fixed all missing includes when building each .hpp separately

include/beast/core/detail/type_traits.hpp

@@ -20,6 +20,19 @@ struct make_void
 template<class... Ts>
 using void_t = typename make_void<Ts...>::type;
 
+template<class... Ts>
+inline
+void
+ignore_unused(Ts const& ...)
+{
+}
+
+template<class... Ts>
+inline
+void
+ignore_unused()
+{}
+
 } // detail
 } // beast
 

include/beast/core/impl/basic_streambuf.ipp

@@ -8,6 +8,7 @@
 #ifndef BEAST_IMPL_BASIC_STREAMBUF_IPP
 #define BEAST_IMPL_BASIC_STREAMBUF_IPP
 
+#include <beast/core/detail/type_traits.hpp>
 #include <beast/core/detail/write_dynabuf.hpp>
 #include <boost/assert.hpp>
 #include <algorithm>
@@ -786,6 +787,7 @@ void
 basic_streambuf<Allocator>::
 copy_assign(basic_streambuf const& other, std::false_type)
 {
+    beast::detail::ignore_unused(other);
 }
 
 template<class Allocator>

include/beast/http/basic_dynabuf_body.hpp

@@ -9,6 +9,7 @@
 #define BEAST_HTTP_BASIC_DYNABUF_BODY_HPP
 
 #include <beast/http/body_type.hpp>
+#include <beast/core/detail/type_traits.hpp>
 #include <boost/asio/buffer.hpp>
 
 namespace beast {
@@ -73,6 +74,7 @@ private:
         void
         init(error_code& ec) noexcept
         {
+            beast::detail::ignore_unused(ec);
         }
 
         std::uint64_t

include/beast/http/empty_body.hpp

@@ -9,6 +9,7 @@
 #define BEAST_HTTP_EMPTY_BODY_HPP
 
 #include <beast/http/body_type.hpp>
+#include <beast/core/detail/type_traits.hpp>
 #include <boost/asio/buffer.hpp>
 #include <memory>
 #include <string>
@@ -39,11 +40,13 @@ private:
         explicit
         writer(message<isRequest, empty_body, Headers> const& m) noexcept
         {
+            beast::detail::ignore_unused(m);
         }
 
         void
         init(error_code& ec) noexcept
         {
+            beast::detail::ignore_unused(ec);
         }
 
         std::uint64_t

include/beast/http/impl/message.ipp

@@ -12,6 +12,7 @@
 #include <beast/http/concepts.hpp>
 #include <beast/http/rfc7230.hpp>
 #include <beast/core/detail/ci_char_traits.hpp>
+#include <beast/core/detail/type_traits.hpp>
 #include <boost/assert.hpp>
 #include <boost/optional.hpp>
 #include <stdexcept>
@@ -61,6 +62,7 @@ void
 prepare_options(prepare_info& pi,
     message<isRequest, Body, Headers>& msg)
 {
+    beast::detail::ignore_unused(pi, msg);
 }
 
 template<bool isRequest, class Body, class Headers>
@@ -69,6 +71,7 @@ prepare_option(prepare_info& pi,
     message<isRequest, Body, Headers>& msg,
         connection value)
 {
+    beast::detail::ignore_unused(msg);
     pi.connection_value = value;
 }
 
@@ -106,6 +109,7 @@ prepare_content_length(prepare_info& pi,
     message<isRequest, Body, Headers> const& msg,
         std::false_type)
 {
+    beast::detail::ignore_unused(msg);
     pi.content_length = boost::none;
 }
 

include/beast/http/parser_v1.hpp

@@ -12,6 +12,7 @@
 #include <beast/http/headers_parser_v1.hpp>
 #include <beast/http/message.hpp>
 #include <beast/core/error.hpp>
+#include <beast/core/detail/type_traits.hpp>
 #include <boost/assert.hpp>
 #include <boost/optional.hpp>
 #include <functional>
@@ -231,13 +232,13 @@ private:
         m_.reason = std::move(this->reason_);
     }
 
-    void on_request(error_code& ec)
+    void on_request(error_code&)
     {
         on_request_or_response(
             std::integral_constant<bool, isRequest>{});
     }
 
-    void on_response(error_code& ec)
+    void on_response(error_code&)
     {
         on_request_or_response(
             std::integral_constant<bool, isRequest>{});
@@ -256,7 +257,7 @@ private:
     }
 
     void
-    on_headers(std::uint64_t, error_code& ec)
+    on_headers(std::uint64_t, error_code&)
     {
         flush();
         m_.version = 10 * this->http_major() + this->http_minor();

include/beast/http/string_body.hpp

@@ -9,6 +9,7 @@
 #define BEAST_HTTP_STRING_BODY_HPP
 
 #include <beast/http/body_type.hpp>
+#include <beast/core/detail/type_traits.hpp>
 #include <boost/asio/buffer.hpp>
 #include <memory>
 #include <string>
@@ -73,6 +74,7 @@ private:
         void
         init(error_code& ec) noexcept
         {
+            beast::detail::ignore_unused(ec);
         }
 
         std::uint64_t

include/beast/websocket/detail/hybi13.hpp

@@ -11,6 +11,7 @@
 #include <beast/core/detail/base64.hpp>
 #include <beast/core/detail/sha1.hpp>
 #include <boost/utility/string_ref.hpp>
+#include <array>
 #include <cstdint>
 #include <string>
 #include <type_traits>

include/beast/websocket/impl/accept_op.ipp

@@ -14,6 +14,7 @@
 #include <beast/http/read.hpp>
 #include <beast/core/handler_alloc.hpp>
 #include <beast/core/prepare_buffers.hpp>
+#include <beast/core/detail/type_traits.hpp>
 #include <boost/assert.hpp>
 #include <memory>
 #include <type_traits>
@@ -112,11 +113,12 @@ public:
 
 template<class NextLayer>
 template<class Handler>
-void 
+void
 stream<NextLayer>::accept_op<Handler>::
 operator()(error_code const& ec,
     std::size_t bytes_transferred, bool again)
 {
+    beast::detail::ignore_unused(bytes_transferred);
     auto& d = *d_;
     d.cont = d.cont || again;
     while(! ec && d.state != 99)