From 7d89fdc46fa1327028c5234be4b29bf7d6a5666a Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Wed, 7 Jun 2017 05:10:58 -0700
Subject: [PATCH] Remove obsolete serializer allocator (API Change)

---
 CHANGELOG.md                           |   1 +
 include/beast/http/impl/serializer.ipp |  37 ++++----
 include/beast/http/impl/write.ipp      | 119 ++++++++++++-------------
 include/beast/http/serializer.hpp      |  29 ++----
 include/beast/http/write.hpp           |  54 +++++------
 test/http/doc_snippets.cpp             |   3 +-
 6 files changed, 105 insertions(+), 138 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd854c09..5840c040 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ API Changes:
 * Protect basic_fields special members
 * Remove message connection settings
 * Remove message free functions
+* Remove obsolete serializer allocator
 
 --------------------------------------------------------------------------------
 
diff --git a/include/beast/http/impl/serializer.ipp b/include/beast/http/impl/serializer.ipp
index 15b0dcb6..79df9268 100644
--- a/include/beast/http/impl/serializer.ipp
+++ b/include/beast/http/impl/serializer.ipp
@@ -16,43 +16,39 @@
 namespace beast {
 namespace http {
 
-template<bool isRequest, class Body, class Fields,
-    class ChunkDecorator, class Allocator>
+template<bool isRequest, class Body,
+    class Fields, class ChunkDecorator>
 void
-serializer<isRequest, Body, Fields,
-    ChunkDecorator, Allocator>::
+serializer<isRequest, Body, Fields, ChunkDecorator>::
 frdinit(std::true_type)
 {
     frd_.emplace(m_, m_.version, m_.method());
 }
 
-template<bool isRequest, class Body, class Fields,
-    class ChunkDecorator, class Allocator>
+template<bool isRequest, class Body,
+    class Fields, class ChunkDecorator>
 void
-serializer<isRequest, Body, Fields,
-    ChunkDecorator, Allocator>::
+serializer<isRequest, Body, Fields, ChunkDecorator>::
 frdinit(std::false_type)
 {
     frd_.emplace(m_, m_.version, m_.result_int());
 }
 
-template<bool isRequest, class Body, class Fields,
-    class ChunkDecorator, class Allocator>
-serializer<isRequest, Body, Fields,
-    ChunkDecorator, Allocator>::
+template<bool isRequest, class Body,
+    class Fields, class ChunkDecorator>
+serializer<isRequest, Body, Fields, ChunkDecorator>::
 serializer(message<isRequest, Body, Fields> const& m,
-        ChunkDecorator const& d, Allocator const& alloc)
+        ChunkDecorator const& d)
     : m_(m)
     , d_(d)
 {
 }
 
-template<bool isRequest, class Body, class Fields,
-    class ChunkDecorator, class Allocator>
+template<bool isRequest, class Body,
+    class Fields, class ChunkDecorator>
 template<class Visit>
 void
-serializer<isRequest, Body, Fields,
-    ChunkDecorator, Allocator>::
+serializer<isRequest, Body, Fields, ChunkDecorator>::
 get(error_code& ec, Visit&& visit)
 {
     using boost::asio::buffer_size;
@@ -258,11 +254,10 @@ get(error_code& ec, Visit&& visit)
     }
 }
 
-template<bool isRequest, class Body, class Fields,
-    class ChunkDecorator, class Allocator>
+template<bool isRequest, class Body,
+    class Fields, class ChunkDecorator>
 void
-serializer<isRequest, Body, Fields,
-    ChunkDecorator, Allocator>::
+serializer<isRequest, Body, Fields, ChunkDecorator>::
 consume(std::size_t n)
 {
     using boost::asio::buffer_size;
diff --git a/include/beast/http/impl/write.ipp b/include/beast/http/impl/write.ipp
index 53b57b57..2c757634 100644
--- a/include/beast/http/impl/write.ipp
+++ b/include/beast/http/impl/write.ipp
@@ -27,14 +27,14 @@ namespace beast {
 namespace http {
 namespace detail {
 
-template<class Stream, bool isRequest, class Body,
-    class Fields, class Decorator, class Allocator,
+template<class Stream, bool isRequest,
+    class Body, class Fields, class Decorator,
         class Handler>
 class write_some_op
 {
     Stream& s_;
-    serializer<isRequest, Body, Fields,
-        Decorator, Allocator>& sr_;
+    serializer<isRequest,
+        Body, Fields, Decorator>& sr_;
     Handler h_;
 
     class lambda
@@ -68,7 +68,7 @@ public:
     template<class DeducedHandler>
     write_some_op(DeducedHandler&& h,
         Stream& s, serializer<isRequest, Body,
-            Fields, Decorator, Allocator>& sr)
+            Fields, Decorator>& sr)
         : s_(s)
         , sr_(sr)
         , h_(std::forward<DeducedHandler>(h))
@@ -117,12 +117,11 @@ public:
     }
 };
 
-template<class Stream, bool isRequest, class Body,
-    class Fields, class Decorator, class Allocator,
-        class Handler>
+template<class Stream, bool isRequest,class Body,
+    class Fields, class Decorator, class Handler>
 void
 write_some_op<Stream, isRequest, Body,
-    Fields, Decorator, Allocator, Handler>::
+    Fields, Decorator, Handler>::
 operator()()
 {
     error_code ec;
@@ -146,11 +145,10 @@ operator()()
 }
 
 template<class Stream, bool isRequest, class Body,
-    class Fields, class Decorator, class Allocator,
-        class Handler>
+    class Fields, class Decorator, class Handler>
 void
 write_some_op<Stream, isRequest, Body,
-    Fields, Decorator, Allocator, Handler>::
+    Fields, Decorator, Handler>::
 operator()(error_code ec, std::size_t bytes_transferred)
 {
     if(! ec)
@@ -162,11 +160,11 @@ operator()(error_code ec, std::size_t bytes_transferred)
 
 struct serializer_is_header_done
 {
-    template<bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+    template<bool isRequest, class Body,
+        class Fields, class Decorator>
     bool
-    operator()(serializer<isRequest, Body, Fields,
-        Decorator, Allocator> const& sr) const
+    operator()(serializer<isRequest, Body,
+        Fields, Decorator> const& sr) const
     {
         return sr.is_header_done();
     }
@@ -174,25 +172,25 @@ struct serializer_is_header_done
 
 struct serializer_is_done
 {
-    template<bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+    template<bool isRequest, class Body,
+        class Fields, class Decorator>
     bool
-    operator()(serializer<isRequest, Body, Fields,
-        Decorator, Allocator> const& sr) const
+    operator()(serializer<isRequest, Body,
+        Fields, Decorator> const& sr) const
     {
         return sr.is_done();
     }
 };
 
-template<class Stream, bool isRequest, class Body,
-    class Fields, class Decorator, class Allocator,
+template<class Stream, bool isRequest,
+    class Body, class Fields, class Decorator,
         class Predicate, class Handler>
 class write_op
 {
     int state_ = 0;
     Stream& s_;
-    serializer<isRequest, Body, Fields,
-        Decorator, Allocator>& sr_;
+    serializer<isRequest,
+        Body, Fields, Decorator>& sr_;
     Handler h_;
 
     class lambda
@@ -226,7 +224,7 @@ public:
     template<class DeducedHandler>
     write_op(DeducedHandler&& h, Stream& s,
         serializer<isRequest, Body, Fields,
-            Decorator, Allocator>& sr)
+            Decorator>& sr)
         : s_(s)
         , sr_(sr)
         , h_(std::forward<DeducedHandler>(h))
@@ -275,11 +273,11 @@ public:
 };
 
 template<class Stream, bool isRequest, class Body,
-    class Fields, class Decorator, class Allocator,
-        class Predicate, class Handler>
+    class Fields, class Decorator, class Predicate,
+        class Handler>
 void
 write_op<Stream, isRequest, Body, Fields,
-    Decorator, Allocator, Predicate, Handler>::
+    Decorator, Predicate, Handler>::
 operator()(error_code ec,
     std::size_t bytes_transferred)
 {
@@ -354,14 +352,13 @@ class write_msg_op
     struct data
     {
         Stream& s;
-        serializer<isRequest, Body, Fields,
-            no_chunk_decorator, handler_alloc<char, Handler>> sr;
+        serializer<isRequest,
+            Body, Fields, no_chunk_decorator> sr;
 
         data(Handler& h, Stream& s_, message<
                 isRequest, Body, Fields> const& m_)
             : s(s_)
-            , sr(m_, no_chunk_decorator{},
-                handler_alloc<char, Handler>{h})
+            , sr(m_, no_chunk_decorator{})
         {
         }
     };
@@ -503,11 +500,10 @@ public:
 //------------------------------------------------------------------------------
 
 template<class SyncWriteStream, bool isRequest,
-    class Body, class Fields, class Decorator,
-        class Allocator>
+    class Body, class Fields, class Decorator>
 void
 write_some(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr)
+    isRequest, Body, Fields, Decorator>& sr)
 {
     static_assert(is_sync_write_stream<SyncWriteStream>::value,
         "SyncWriteStream requirements not met");
@@ -521,13 +517,12 @@ write_some(SyncWriteStream& stream, serializer<
         BOOST_THROW_EXCEPTION(system_error{ec});
 }
 
-template<
-    class SyncWriteStream,
+template<class SyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+        class Decorator>
 void
 write_some(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         error_code& ec)
 {
     static_assert(is_sync_write_stream<SyncWriteStream>::value,
@@ -549,10 +544,10 @@ write_some(SyncWriteStream& stream, serializer<
 
 template<class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator, class WriteHandler>
+        class Decorator, class WriteHandler>
 async_return_type<WriteHandler, void(error_code)>
 async_write_some(AsyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         WriteHandler&& handler)
 {
     static_assert(is_async_write_stream<
@@ -565,7 +560,7 @@ async_write_some(AsyncWriteStream& stream, serializer<
     async_completion<WriteHandler,
         void(error_code)> init{handler};
     detail::write_some_op<AsyncWriteStream, isRequest,
-        Body, Fields, Decorator, Allocator, handler_type<
+        Body, Fields, Decorator, handler_type<
             WriteHandler, void(error_code)>>{
                 init.completion_handler, stream, sr}();
     return init.result.get();
@@ -573,13 +568,12 @@ async_write_some(AsyncWriteStream& stream, serializer<
 
 //------------------------------------------------------------------------------
 
-template<
-    class SyncWriteStream,
+template<class SyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+        class Decorator>
 void
 write_header(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr)
+    isRequest, Body, Fields, Decorator>& sr)
 {
     static_assert(is_sync_write_stream<SyncWriteStream>::value,
         "SyncWriteStream requirements not met");
@@ -593,13 +587,12 @@ write_header(SyncWriteStream& stream, serializer<
         BOOST_THROW_EXCEPTION(system_error{ec});
 }
 
-template<
-    class SyncWriteStream,
+template<class SyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+        class Decorator>
 void
 write_header(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         error_code& ec)
 {
     static_assert(is_sync_write_stream<SyncWriteStream>::value,
@@ -622,10 +615,10 @@ write_header(SyncWriteStream& stream, serializer<
 
 template<class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator, class WriteHandler>
+        class Decorator, class WriteHandler>
 async_return_type<WriteHandler, void(error_code)>
 async_write_header(AsyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         WriteHandler&& handler)
 {
     static_assert(is_async_write_stream<
@@ -639,7 +632,7 @@ async_write_header(AsyncWriteStream& stream, serializer<
     async_completion<WriteHandler,
         void(error_code)> init{handler};
     detail::write_op<AsyncWriteStream, isRequest, Body, Fields,
-        Decorator, Allocator, detail::serializer_is_header_done,
+        Decorator, detail::serializer_is_header_done,
             handler_type<WriteHandler, void(error_code)>>{
                 init.completion_handler, stream, sr}(
                     error_code{}, 0);
@@ -648,13 +641,12 @@ async_write_header(AsyncWriteStream& stream, serializer<
 
 //------------------------------------------------------------------------------
 
-template<
-    class SyncWriteStream,
+template<class SyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+        class Decorator>
 void
 write(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr)
+    isRequest, Body, Fields, Decorator>& sr)
 {
     static_assert(is_sync_write_stream<SyncWriteStream>::value,
         "SyncWriteStream requirements not met");
@@ -664,13 +656,12 @@ write(SyncWriteStream& stream, serializer<
         BOOST_THROW_EXCEPTION(system_error{ec});
 }
 
-template<
-    class SyncWriteStream,
+template<class SyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+        class Decorator>
 void
 write(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         error_code& ec)
 {
     static_assert(is_sync_write_stream<SyncWriteStream>::value,
@@ -691,10 +682,10 @@ write(SyncWriteStream& stream, serializer<
 
 template<class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator, class WriteHandler>
+        class Decorator, class WriteHandler>
 async_return_type<WriteHandler, void(error_code)>
 async_write(AsyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         WriteHandler&& handler)
 {
     static_assert(is_async_write_stream<
@@ -708,7 +699,7 @@ async_write(AsyncWriteStream& stream, serializer<
     async_completion<WriteHandler,
         void(error_code)> init{handler};
     detail::write_op<AsyncWriteStream, isRequest, Body,
-        Fields, Decorator, Allocator, detail::serializer_is_done,
+        Fields, Decorator, detail::serializer_is_done,
             handler_type<WriteHandler, void(error_code)>>{
                 init.completion_handler, stream, sr}(
                     error_code{}, 0);
diff --git a/include/beast/http/serializer.hpp b/include/beast/http/serializer.hpp
index 59c5d107..4351f07e 100644
--- a/include/beast/http/serializer.hpp
+++ b/include/beast/http/serializer.hpp
@@ -9,7 +9,6 @@
 #define BEAST_HTTP_SERIALIZER_HPP
 
 #include <beast/config.hpp>
-#include <beast/core/async_result.hpp>
 #include <beast/core/buffer_cat.hpp>
 #include <beast/core/consuming_buffers.hpp>
 #include <beast/core/string_view.hpp>
@@ -19,7 +18,6 @@
 #include <boost/asio/buffer.hpp>
 #include <boost/optional.hpp>
 #include <boost/variant.hpp>
-#include <memory>
 
 namespace beast {
 namespace http {
@@ -117,15 +115,11 @@ struct no_chunk_decorator
 
     @tparam ChunkDecorator The type of chunk decorator to use.
 
-    @tparam Allocator The type of allocator to use.
-
     @see @ref make_serializer
 */
 template<
     bool isRequest, class Body, class Fields,
-    class ChunkDecorator = no_chunk_decorator,
-    class Allocator = std::allocator<char>
->
+    class ChunkDecorator = no_chunk_decorator>
 class serializer
 {
     static_assert(is_body<Body>::value,
@@ -194,7 +188,6 @@ class serializer
 
     message<isRequest, Body, Fields> const& m_;
     boost::optional<typename Fields::reader> frd_;
-    ChunkDecorator d_;
     boost::optional<reader> rd_;
     boost::variant<boost::blank,
         ch_t, cb0_t, cb1_t, ch0_t, ch1_t, ch2_t> v_;
@@ -204,6 +197,7 @@ class serializer
     bool chunked_;
     bool close_;
     bool more_;
+    ChunkDecorator d_;
 
 public:
     /** Constructor
@@ -217,13 +211,10 @@ public:
         for the lifetime of the serializer.
 
         @param decorator An optional decorator to use.
-
-        @param alloc An optional allocator to use.
     */
     explicit
     serializer(message<isRequest, Body, Fields> const& msg,
-        ChunkDecorator const& decorator = ChunkDecorator{},
-            Allocator const& alloc = Allocator{});
+        ChunkDecorator const& decorator = ChunkDecorator{});
 
     /** Returns `true` if we will pause after writing the complete header.
     */
@@ -340,20 +331,16 @@ public:
 */
 template<
     bool isRequest, class Body, class Fields,
-    class ChunkDecorator = no_chunk_decorator,
-    class Allocator = std::allocator<char>>
+    class ChunkDecorator = no_chunk_decorator>
 inline
 serializer<isRequest, Body, Fields,
-    typename std::decay<ChunkDecorator>::type,
-    typename std::decay<Allocator>::type>
+    typename std::decay<ChunkDecorator>::type>
 make_serializer(message<isRequest, Body, Fields> const& m,
-    ChunkDecorator const& decorator = ChunkDecorator{},
-        Allocator const& allocator = Allocator{})
+    ChunkDecorator const& decorator = ChunkDecorator{})
 {
     return serializer<isRequest, Body, Fields,
-        typename std::decay<ChunkDecorator>::type,
-        typename std::decay<Allocator>::type>{
-            m, decorator, allocator};
+        typename std::decay<ChunkDecorator>::type>{
+            m, decorator};
 }
 
 } // http
diff --git a/include/beast/http/write.hpp b/include/beast/http/write.hpp
index eed4250a..24332804 100644
--- a/include/beast/http/write.hpp
+++ b/include/beast/http/write.hpp
@@ -58,12 +58,11 @@ namespace http {
 
     @see serializer
 */
-template<class SyncWriteStream,
-    bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+template<class SyncWriteStream, bool isRequest,
+    class Body, class Fields, class Decorator>
 void
 write_some(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr);
+    isRequest, Body, Fields, Decorator>& sr);
 
 /** Write part of a message to a stream using a serializer.
 
@@ -95,12 +94,11 @@ write_some(SyncWriteStream& stream, serializer<
 
     @see @ref async_write_some, @ref serializer
 */
-template<class SyncWriteStream,
-    bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+template<class SyncWriteStream, bool isRequest,
+    class Body, class Fields, class Decorator>
 void
 write_some(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         error_code& ec);
 
 /** Write part of a message to a stream asynchronously using a serializer.
@@ -149,14 +147,14 @@ write_some(SyncWriteStream& stream, serializer<
 */
 template<class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator, class WriteHandler>
+        class Decorator, class WriteHandler>
 #if BEAST_DOXYGEN
     void_or_deduced
 #else
 async_return_type<WriteHandler, void(error_code)>
 #endif
 async_write_some(AsyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         WriteHandler&& handler);
 
 //------------------------------------------------------------------------------
@@ -186,12 +184,11 @@ async_write_some(AsyncWriteStream& stream, serializer<
 
     @see @ref serializer
 */
-template<class SyncWriteStream,
-    bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+template<class SyncWriteStream, bool isRequest,
+    class Body, class Fields, class Decorator>
 void
 write_header(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr);
+    isRequest, Body, Fields, Decorator>& sr);
 
 /** Write a header to a stream using a serializer.
 
@@ -218,12 +215,11 @@ write_header(SyncWriteStream& stream, serializer<
 
     @see @ref serializer
 */
-template<class SyncWriteStream,
-    bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+template<class SyncWriteStream, bool isRequest,
+    class Body, class Fields, class Decorator>
 void
 write_header(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         error_code& ec);
 
 /** Write a header to a stream asynchronously using a serializer.
@@ -267,14 +263,14 @@ write_header(SyncWriteStream& stream, serializer<
 */
 template<class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator, class WriteHandler>
+        class Decorator, class WriteHandler>
 #if BEAST_DOXYGEN
     void_or_deduced
 #else
 async_return_type<WriteHandler, void(error_code)>
 #endif
 async_write_header(AsyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         WriteHandler&& handler);
 
 //------------------------------------------------------------------------------
@@ -301,12 +297,11 @@ async_write_header(AsyncWriteStream& stream, serializer<
 
     @see @ref serializer
 */
-template<class SyncWriteStream,
-    bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+template<class SyncWriteStream, bool isRequest,
+    class Body, class Fields, class Decorator>
 void
 write(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr);
+    isRequest, Body, Fields, Decorator>& sr);
 
 /** Write a complete message to a stream using a serializer.
 
@@ -330,12 +325,11 @@ write(SyncWriteStream& stream, serializer<
 
     @see @ref serializer
 */
-template<class SyncWriteStream,
-    bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator>
+template<class SyncWriteStream, bool isRequest,
+    class Body, class Fields, class Decorator>
 void
 write(SyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         error_code& ec);
 
 /** Write a complete message to a stream asynchronously using a serializer.
@@ -376,14 +370,14 @@ write(SyncWriteStream& stream, serializer<
 */
 template<class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-        class Decorator, class Allocator, class WriteHandler>
+        class Decorator, class WriteHandler>
 #if BEAST_DOXYGEN
     void_or_deduced
 #else
 async_return_type<WriteHandler, void(error_code)>
 #endif
 async_write(AsyncWriteStream& stream, serializer<
-    isRequest, Body, Fields, Decorator, Allocator>& sr,
+    isRequest, Body, Fields, Decorator>& sr,
         WriteHandler&& handler);
 
 //------------------------------------------------------------------------------
diff --git a/test/http/doc_snippets.cpp b/test/http/doc_snippets.cpp
index 8d357bdb..473330ac 100644
--- a/test/http/doc_snippets.cpp
+++ b/test/http/doc_snippets.cpp
@@ -342,8 +342,7 @@ template<
     bool isRequest,
     class Body,
     class Fields,
-    class ChunkDecorator = no_chunk_decorator,
-    class Allocator = std::allocator<char>
+    class ChunkDecorator = no_chunk_decorator
 >
 class serializer;