Tidy up tests and docs:

* Add handler_ptr test and increase coverage
* Add test for prepare_buffer
* Move is_call_possible tests to a .cpp file
* Tidy up docs and declarations

CHANGELOG.md

@@ -1,5 +1,7 @@
 1.0.0-b27
 
+* Tidy up tests and docs
+
 API Changes:
 
 * Invoke callback on pings and pongs

doc/master.qbk

@@ -29,15 +29,16 @@
 
 [def __asio_handler_invoke__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/asio_handler_invoke.html `asio_handler_invoke`]]
 [def __asio_handler_allocate__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/asio_handler_allocate.html `asio_handler_allocate`]]
-[def __void_or_deduced__ [@http://www.boost.org/doc/libs/1_60_0/doc/html/boost_asio/reference/asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function ['void-or-deduced]]]
+[def __void_or_deduced__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function ['void-or-deduced]]]
 
 [def __AsyncReadStream__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/AsyncReadStream.html [*AsyncReadStream]]]
 [def __AsyncWriteStream__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/AsyncWriteStream.html [*AsyncWriteStream]]]
-[def __CompletionHandler__ [@http://www.boost.org/doc/libs/1_60_0/doc/html/boost_asio/reference/CompletionHandler.html [*CompletionHandler]]]
+[def __CompletionHandler__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/CompletionHandler.html [*CompletionHandler]]]
 [def __ConstBufferSequence__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/ConstBufferSequence.html [*ConstBufferSequence]]]
+[def __Handler__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/Handler.html [*Handler]]]
 [def __MutableBufferSequence__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/MutableBufferSequence.html [*MutableBufferSequence]]]
 [def __SyncReadStream__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/SyncReadStream.html [*SyncReadStream]]]
-[def __SyncWriteStream__ [@http://www.boost.org/doc/libs/1_60_0/doc/html/boost_asio/reference/SyncWriteStream.html [*SyncWriteStream]]]
+[def __SyncWriteStream__ [@http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/SyncWriteStream.html [*SyncWriteStream]]]
 
 [def __Body__             [link beast.ref.Body [*`Body`]]]
 [def __DynamicBuffer__    [link beast.ref.DynamicBuffer [*DynamicBuffer]]]

doc/reference.xsl

@@ -1580,6 +1580,9 @@
     <xsl:when test="declname = 'DynamicBuffer' or type = 'class DynamicBuffer'">
       <xsl:text>class ``[link beast.ref.DynamicBuffer [*DynamicBuffer]]``</xsl:text>
     </xsl:when>
+    <xsl:when test="declname = 'Handler' or type = 'class Handler'">
+      <xsl:text>class __Handler__</xsl:text>
+    </xsl:when>
     <xsl:when test="declname = 'MutableBufferSequence' or type = 'class MutableBufferSequence'">
       <xsl:text>class __MutableBufferSequence__</xsl:text>
     </xsl:when>

include/beast/core/bind_handler.hpp

@@ -15,21 +15,23 @@
 
 namespace beast {
 
-/** Bind parameters to a completion handler, creating a wrapped handler.
+/** Bind parameters to a completion handler, creating a new handler.
 
     This function creates a new handler which, when invoked with no
-    parameters, calls the original handler with the list of bound arguments.
+    parameters, calls the original handler with the list of bound
-    The passed handler and arguments are forwarded into the returned handler,
+    arguments. The passed handler and arguments are forwarded into
-    which provides the same `io_service` execution guarantees as the original
+    the returned handler, which provides the same `io_service`
-    handler.
+    execution guarantees as the original handler.
 
-    Unlike `io_service::wrap`, the returned handler can be used in a
+    Unlike `io_service::wrap`, the returned handler can be used in
-    subsequent call to `io_service::post` instead of `io_service::dispatch`,
+    a subsequent call to `io_service::post` instead of
-    to ensure that the handler will not be invoked immediately by the
+    `io_service::dispatch`, to ensure that the handler will not be
-    calling function.
+    invoked immediately by the calling function.
 
     Example:
+
     @code
+
     template<class AsyncReadStream, class ReadHandler>
     void
     do_cancel(AsyncReadStream& stream, ReadHandler&& handler)
@@ -38,6 +40,7 @@ namespace beast {
             bind_handler(std::forward<ReadHandler>(handler),
                 boost::asio::error::operation_aborted, 0));
     }
+
     @endcode
 
     @param handler The handler to wrap.
@@ -45,22 +48,21 @@ namespace beast {
     @param args A list of arguments to bind to the handler. The
     arguments are forwarded into the returned object.
 */
-template<class CompletionHandler, class... Args>
+template<class Handler, class... Args>
 #if GENERATING_DOCS
 implementation_defined
 #else
 detail::bound_handler<
-    typename std::decay<CompletionHandler>::type, Args...>
+    typename std::decay<Handler>::type, Args...>
 #endif
-bind_handler(CompletionHandler&& handler, Args&&... args)
+bind_handler(Handler&& handler, Args&&... args)
 {
     static_assert(is_CompletionHandler<
-        CompletionHandler, void(Args...)>::value,
+        Handler, void(Args...)>::value,
-            "CompletionHandler requirements not met");
+            "Handler requirements not met");
     return detail::bound_handler<typename std::decay<
-        CompletionHandler>::type, Args...>(std::forward<
+        Handler>::type, Args...>(std::forward<
-            CompletionHandler>(handler),
+            Handler>(handler), std::forward<Args>(args)...);
-                std::forward<Args>(args)...);
 }
 
 } // beast

include/beast/core/buffer_cat.hpp

@@ -24,8 +24,9 @@ namespace beast {
     This function returns a constant or mutable buffer sequence which,
     when iterated, efficiently concatenates the input buffer sequences.
     Copies of the arguments passed will be made; however, the returned
-    object does not take ownership of the underlying memory. The application
+    object does not take ownership of the underlying memory. The
-    is still responsible for managing the lifetime of the referenced memory.
+    application is still responsible for managing the lifetime of the
+    referenced memory.
 
     @param buffers The list of buffer sequences to concatenate.
 

include/beast/core/consuming_buffers.hpp

@@ -30,12 +30,6 @@ namespace beast {
     is still responsible for managing its lifetime.
 
     @tparam BufferSequence The buffer sequence to wrap.
-
-    @tparam ValueType The type of buffer of the final buffer sequence. This
-    can be different from the buffer type of the wrapped sequence. For
-    example, a `MutableBufferSequence` can be transformed into a
-    consumable `ConstBufferSequence`. Violations of buffer const safety
-    are not permitted, and will result in a compile error.
 */
 template<class BufferSequence>
 class consuming_buffers
@@ -45,6 +39,7 @@ class consuming_buffers
 
     BufferSequence bs_;
     iter_type begin_;
+    iter_type end_;
     std::size_t skip_ = 0;
 
     template<class Deduced>
@@ -56,13 +51,23 @@ class consuming_buffers
     }
 
 public:
-    /// The type for each element in the list of buffers.
+    /** The type for each element in the list of buffers.
+
+        If the buffers in the underlying sequence are convertible to
+        `boost::asio::mutable_buffer`, then this type will be
+        `boost::asio::mutable_buffer`, else this type will be
+        `boost::asio::const_buffer`.
+    */
+#if GENERATING_DOCS
+    using value_type = ...;
+#else
     using value_type = typename std::conditional<
         std::is_convertible<typename
             std::iterator_traits<iter_type>::value_type,
                 boost::asio::mutable_buffer>::value,
                     boost::asio::mutable_buffer,
                         boost::asio::const_buffer>::type;
+#endif
 
 #if GENERATING_DOCS
     /// A bidirectional iterator type that may be used to read elements.

include/beast/core/detail/bind_handler.hpp

@@ -42,7 +42,8 @@ public:
 
     template<class DeducedHandler>
     explicit
-    bound_handler(DeducedHandler&& handler, Args&&... args)
+    bound_handler(
+            DeducedHandler&& handler, Args&&... args)
         : h_(std::forward<DeducedHandler>(handler))
         , args_(std::forward<Args>(args)...)
     {
@@ -102,9 +103,11 @@ public:
 } // beast
 
 #include <functional>
+
 namespace std {
 template<class Handler, class... Args>
-void bind(beast::detail::bound_handler<
+void
+bind(beast::detail::bound_handler<
     Handler, Args...>, ...) = delete;
 } // std
 

include/beast/core/detail/is_call_possible.hpp

@@ -26,8 +26,12 @@ std::false_type
 is_call_possible_test(C&& c, long, A&& ...a);
 
 /** Metafunction returns `true` if F callable as R(A...)
+    
     Example:
+    
+    @code
         is_call_possible<T, void(std::string)>
+    @endcode
 */
 /** @{ */
 template<class C, class F>
@@ -44,49 +48,6 @@ struct is_call_possible<C, R(A...)>
 };
 /** @} */
 
-namespace test {
-
-struct is_call_possible_udt1
-{
-    void operator()(int) const;
-};
-
-struct is_call_possible_udt2
-{
-    int operator()(int) const;
-};
-
-struct is_call_possible_udt3
-{
-    int operator()(int);
-};
-
-#ifndef __INTELLISENSE__
-// VFALCO Fails to compile with Intellisense
-static_assert(is_call_possible<
-    is_call_possible_udt1, void(int)>::value, "");
-
-static_assert(! is_call_possible<
-    is_call_possible_udt1, void(void)>::value, "");
-
-static_assert(is_call_possible<
-    is_call_possible_udt2, int(int)>::value, "");
-
-static_assert(! is_call_possible<
-    is_call_possible_udt2, int(void)>::value, "");
-
-static_assert(! is_call_possible<
-    is_call_possible_udt2, void(void)>::value, "");
-
-static_assert(is_call_possible<
-    is_call_possible_udt3, int(int)>::value, "");
-
-static_assert(! is_call_possible<
-    is_call_possible_udt3 const, int(int)>::value, "");
-#endif
-
-} // test
-
 } // detail
 } // beast
 

include/beast/core/dynabuf_readstream.hpp

@@ -179,13 +179,7 @@ public:
         return sb_;
     }
 
-    /** Access the internal buffer.
+    /// Access the internal buffer
-
-        The internal buffer is returned. It is possible for the
-        caller to break invariants with this function. For example,
-        by causing the internal buffer size to increase beyond
-        the caller defined maximum.
-    */
     DynamicBuffer const&
     buffer() const
     {
@@ -213,8 +207,83 @@ public:
         capacity_ = size;
     }
 
-    /// Write the given data to the stream. Returns the number of bytes written.
+    /** Read some data from the stream.
-    /// Throws an exception on failure.
+        
+        This function is used to read data from the stream.
+        The function call will block until one or more bytes of
+        data has been read successfully, or until an error occurs.
+
+        @param buffers One or more buffers into which the data will be read.
+
+        @return The number of bytes read.
+
+        @throws system_error Thrown on failure.
+    */
+    template<class MutableBufferSequence>
+    std::size_t
+    read_some(MutableBufferSequence const& buffers);
+
+    /** Read some data from the stream.
+        
+        This function is used to read data from the stream.
+        The function call will block until one or more bytes of
+        data has been read successfully, or until an error occurs.
+
+        @param buffers One or more buffers into which the data will be read.
+
+        @param ec Set to the error, if any occurred.
+
+        @return The number of bytes read, or 0 on error.
+    */
+    template<class MutableBufferSequence>
+    std::size_t
+    read_some(MutableBufferSequence const& buffers,
+        error_code& ec);
+
+    /** Start an asynchronous read.
+
+        This function is used to asynchronously read data from
+        the stream. The function call always returns immediately.
+
+        @param buffers One or more buffers into which the data
+        will be read. Although the buffers object may be copied
+        as necessary, ownership of the underlying memory blocks
+        is retained by the caller, which must guarantee that they
+        remain valid until the handler is called.
+
+        @param handler The handler to be called when the operation
+        completes. Copies will be made of the handler as required.
+        The equivalent function signature of the handler must be:
+        @code void handler(
+            error_code const& error,      // result of operation
+            std::size_t bytes_transferred // number of bytes transferred
+        ); @endcode
+        Regardless of whether the asynchronous operation completes
+        immediately or not, the handler will not be invoked from within
+        this function. Invocation of the handler will be performed in a
+        manner equivalent to using `boost::asio::io_service::post`.
+    */
+    template<class MutableBufferSequence, class ReadHandler>
+#if GENERATING_DOCS
+    void_or_deduced
+#else
+    typename async_completion<ReadHandler, void(error_code)>::result_type
+#endif
+    async_read_some(MutableBufferSequence const& buffers,
+        ReadHandler&& handler);
+
+    /** Write some data to the stream.
+    
+        This function is used to write data to the stream.
+        The function call will block until one or more bytes of the
+        data has been written successfully, or until an error occurs.
+
+        @param buffers One or more data buffers to be written to the stream.
+
+        @return The number of bytes written.
+
+        @throws system_error Thrown on failure.
+    */
     template<class ConstBufferSequence>
     std::size_t
     write_some(ConstBufferSequence const& buffers)
@@ -224,8 +293,18 @@ public:
         return next_layer_.write_some(buffers);
     }
 
-    /// Write the given data to the stream. Returns the number of bytes written,
+    /** Write some data to the stream.
-    /// or 0 if an error occurred.
+    
+        This function is used to write data to the stream.
+        The function call will block until one or more bytes of the
+        data has been written successfully, or until an error occurs.
+
+        @param buffers One or more data buffers to be written to the stream.
+
+        @param ec Set to the error, if any occurred.
+
+        @return The number of bytes written.
+    */
     template<class ConstBufferSequence>
     std::size_t
     write_some(ConstBufferSequence const& buffers,
@@ -236,8 +315,29 @@ public:
         return next_layer_.write_some(buffers, ec);
     }
 
-    /// Start an asynchronous write. The data being written must be valid for the
+    /** Start an asynchronous write.
-    /// lifetime of the asynchronous operation.
+    
+        This function is used to asynchronously write data from
+        the stream. The function call always returns immediately.
+
+        @param buffers One or more data buffers to be written to
+        the stream. Although the buffers object may be copied as
+        necessary, ownership of the underlying memory blocks is
+        retained by the caller, which must guarantee that they
+        remain valid until the handler is called.
+
+        @param handler The handler to be called when the operation
+        completes. Copies will be made of the handler as required.
+        The equivalent function signature of the handler must be:
+        @code void handler(
+            error_code const& error,      // result of operation
+            std::size_t bytes_transferred // number of bytes transferred
+        ); @endcode
+        Regardless of whether the asynchronous operation completes
+        immediately or not, the handler will not be invoked from within
+        this function. Invocation of the handler will be performed in a
+        manner equivalent to using `boost::asio::io_service::post`.
+    */
     template<class ConstBufferSequence, class WriteHandler>
 #if GENERATING_DOCS
     void_or_deduced
@@ -246,30 +346,6 @@ public:
 #endif
     async_write_some(ConstBufferSequence const& buffers,
         WriteHandler&& handler);
-
-    /// Read some data from the stream. Returns the number of bytes read.
-    /// Throws an exception on failure.
-    template<class MutableBufferSequence>
-    std::size_t
-    read_some(MutableBufferSequence const& buffers);
-
-    /// Read some data from the stream. Returns the number of bytes read
-    /// or 0 if an error occurred.
-    template<class MutableBufferSequence>
-    std::size_t
-    read_some(MutableBufferSequence const& buffers,
-        error_code& ec);
-
-    /// Start an asynchronous read. The buffer into which the data will be read
-    /// must be valid for the lifetime of the asynchronous operation.
-    template<class MutableBufferSequence, class ReadHandler>
-#if GENERATING_DOCS
-    void_or_deduced
-#else
-    typename async_completion<ReadHandler, void(error_code)>::result_type
-#endif
-    async_read_some(MutableBufferSequence const& buffers,
-        ReadHandler&& handler);
 };
 
 } // beast

include/beast/core/handler_alloc.hpp

@@ -28,28 +28,29 @@ namespace beast {
 
     @tparam T The type of objects allocated by the allocator.
 
-    @tparam CompletionHandler The type of handler.
+    @tparam Handler The type of handler.
 
     @note Memory allocated by this allocator must be freed before
-          the handler is invoked or undefined behavior results.
+    the handler is invoked or undefined behavior results. This behavior
+    is described as the "deallocate before invocation" Asio guarantee.
 */
 #if GENERATING_DOCS
-template<class T, class CompletionHandler>
+template<class T, class Handler>
 class handler_alloc;
 #else
-template<class T, class CompletionHandler>
+template<class T, class Handler>
 class handler_alloc
 {
 private:
     // We want a partial template specialization as a friend
     // but that isn't allowed so we friend all versions. This
-    // should produce a compile error if CompletionHandler is not
+    // should produce a compile error if Handler is not
     // constructible from H.
     //
     template<class U, class H>
     friend class handler_alloc;
 
-    CompletionHandler& h_;
+    Handler& h_;
 
 public:
     using value_type = T;
@@ -58,7 +59,7 @@ public:
     template<class U>
     struct rebind
     {
-        using other = handler_alloc<U, CompletionHandler>;
+        using other = handler_alloc<U, Handler>;
     };
 
     handler_alloc() = delete;
@@ -73,7 +74,7 @@ public:
         remain valid for at least the lifetime of the allocator.
     */
     explicit
-    handler_alloc(CompletionHandler& h)
+    handler_alloc(Handler& h)
         : h_(h)
     {
     }
@@ -81,7 +82,7 @@ public:
     /// Copy constructor
     template<class U>
     handler_alloc(
-            handler_alloc<U, CompletionHandler> const& other)
+            handler_alloc<U, Handler> const& other)
         : h_(other.h_)
     {
     }
@@ -118,7 +119,7 @@ public:
     friend
     bool
     operator==(handler_alloc const& lhs,
-        handler_alloc<U, CompletionHandler> const& rhs)
+        handler_alloc<U, Handler> const& rhs)
     {
         return true;
     }
@@ -127,7 +128,7 @@ public:
     friend
     bool
     operator!=(handler_alloc const& lhs,
-        handler_alloc<U, CompletionHandler> const& rhs)
+        handler_alloc<U, Handler> const& rhs)
     {
         return ! (lhs == rhs);
     }

include/beast/core/placeholders.hpp

@@ -21,9 +21,9 @@ static auto const bytes_transferred (std::placeholders::_2);
 static auto const iterator (std::placeholders::_2);
 static auto const signal_number (std::placeholders::_2);
 }
-}
+} // placeholders
 
-}
+} // asio
-}
+} // beast
 
 #endif

test/Jamfile

@@ -28,6 +28,7 @@ unit-test core-tests :
     core/handler_concepts.cpp
     core/handler_ptr.cpp
     core/placeholders.cpp
+    core/prepare_buffer.cpp
     core/prepare_buffers.cpp
     core/static_streambuf.cpp
     core/static_string.cpp
@@ -38,6 +39,7 @@ unit-test core-tests :
     core/base64.cpp
     core/empty_base_optimization.cpp
     core/get_lowest_layer.cpp
+    core/is_call_possible.cpp
     core/sha1.cpp
     ;
 

test/core/CMakeLists.txt

@@ -22,6 +22,7 @@ add_executable (core-tests
     handler_concepts.cpp
     handler_ptr.cpp
     placeholders.cpp
+    prepare_buffer.cpp
     prepare_buffers.cpp
     static_streambuf.cpp
     static_string.cpp
@@ -32,6 +33,7 @@ add_executable (core-tests
     base64.cpp
     empty_base_optimization.cpp
     get_lowest_layer.cpp
+    is_call_possible.cpp
     sha1.cpp
 )
 

test/core/bind_handler.cpp

@@ -16,15 +16,17 @@ namespace beast {
 class bind_handler_test : public unit_test::suite
 {
 public:
-    static void foo (int)
+    void
+    callback(int v)
     {
+        BEAST_EXPECT(v == 42);
     }
 
     void run()
     {
-        auto f (bind_handler (
+        auto f = bind_handler(std::bind(
-            std::bind (&foo, std::placeholders::_1),
+            &bind_handler_test::callback, this,
-            42));
+                std::placeholders::_1), 42);
         f();
         pass();
     }

test/core/handler_alloc.cpp

@@ -6,23 +6,44 @@
 //
 
 // Test that header file is self-contained.
-#include <beast/core/to_string.hpp>
+#include <beast/core/handler_alloc.hpp>
 
 #include <beast/unit_test/suite.hpp>
-#include <boost/asio/buffer.hpp>
+#include <vector>
 
 namespace beast {
 
-class to_string_test : public beast::unit_test::suite
+class handler_alloc_test : public beast::unit_test::suite
 {
 public:
-    void run()
+    struct handler
+    {
+        void
+        operator()() const
         {
-        BEAST_EXPECT(to_string(boost::asio::const_buffers_1("x", 1)) == "x");
         }
     };
 
-BEAST_DEFINE_TESTSUITE(to_string,core,beast);
+    void
+    run() override
+    {
+        handler h;
+        handler h2;
+        handler_alloc<char, handler> a1{h};
+        handler_alloc<char, handler> a2{h2};
+        BEAST_EXPECT(a2 == a1);
+        auto a3 = a1;
+        BEAST_EXPECT(a3 == a1);
+        {
+            std::vector<char,
+                handler_alloc<char, handler>> v(a1);
+            v.reserve(32);
+            v.resize(10);
+        }
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(handler_alloc,core,beast);
 
 } // beast
 

test/core/handler_ptr.cpp

@@ -7,3 +7,74 @@
 
 // Test that header file is self-contained.
 #include <beast/core/handler_ptr.hpp>
+
+#include <beast/unit_test/suite.hpp>
+#include <exception>
+#include <utility>
+
+namespace beast {
+
+class handler_ptr_test : public beast::unit_test::suite
+{
+public:
+    struct handler
+    {
+        handler() = default;
+        handler(handler const&) = default;
+
+        void
+        operator()(bool& b) const
+        {
+            b = true;
+        }
+    };
+
+    struct T
+    {
+        T(handler&)
+        {
+        }
+
+        ~T()
+        {
+        }
+    };
+
+    struct U
+    {
+        U(handler&)
+        {
+            throw std::exception{};
+        }
+    };
+
+    void
+    run() override
+    {
+        handler h;
+        handler_ptr<T, handler> p1{h};
+        handler_ptr<T, handler> p2{p1};
+        try
+        {
+            handler_ptr<U, handler> p3{h};
+            fail();
+        }
+        catch(std::exception const&)
+        {
+            pass();
+        }
+        catch(...)
+        {
+            fail();
+        }
+        handler_ptr<T, handler> p4{std::move(h)};
+        bool b = false;
+        p4.invoke(std::ref(b));
+        BEAST_EXPECT(b);
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(handler_ptr,core,beast);
+
+} // beast
+

test/core/is_call_possible.cpp

@@ -0,0 +1,56 @@
+//
+// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+// Test that header file is self-contained.
+#include <beast/core/detail/is_call_possible.hpp>
+
+namespace beast {
+namespace detail {
+namespace {
+
+struct is_call_possible_udt1
+{
+    void operator()(int) const;
+};
+
+struct is_call_possible_udt2
+{
+    int operator()(int) const;
+};
+
+struct is_call_possible_udt3
+{
+    int operator()(int);
+};
+
+#ifndef __INTELLISENSE__
+// VFALCO Fails to compile with Intellisense
+static_assert(is_call_possible<
+    is_call_possible_udt1, void(int)>::value, "");
+
+static_assert(! is_call_possible<
+    is_call_possible_udt1, void(void)>::value, "");
+
+static_assert(is_call_possible<
+    is_call_possible_udt2, int(int)>::value, "");
+
+static_assert(! is_call_possible<
+    is_call_possible_udt2, int(void)>::value, "");
+
+static_assert(! is_call_possible<
+    is_call_possible_udt2, void(void)>::value, "");
+
+static_assert(is_call_possible<
+    is_call_possible_udt3, int(int)>::value, "");
+
+static_assert(! is_call_possible<
+    is_call_possible_udt3 const, int(int)>::value, "");
+#endif
+
+}
+} // detail
+} // beast

test/core/prepare_buffer.cpp

@@ -0,0 +1,9 @@
+//
+// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+// Test that header file is self-contained.
+#include <beast/core/prepare_buffer.hpp>

test/core/to_string.cpp

@@ -8,3 +8,21 @@
 // Test that header file is self-contained.
 #include <beast/core/to_string.hpp>
 
+#include <beast/unit_test/suite.hpp>
+#include <boost/asio/buffer.hpp>
+
+namespace beast {
+
+class to_string_test : public beast::unit_test::suite
+{
+public:
+    void run()
+    {
+        BEAST_EXPECT(to_string(boost::asio::const_buffers_1("x", 1)) == "x");
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(to_string,core,beast);
+
+} // beast
+