Tidy up core sources:

The core headers are moved to their own directory (but remain in
the same namespace).

test/core/prepare_buffers.cpp

@@ -0,0 +1,115 @@
+//
+// 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_buffers.hpp>
+
+#include <beast/core/consuming_buffers.hpp>
+#include <beast/unit_test/suite.hpp>
+#include <boost/asio/buffer.hpp>
+#include <string>
+
+namespace beast {
+
+class prepare_buffers_test : public beast::unit_test::suite
+{
+public:
+    template<class ConstBufferSequence>
+    static
+    std::string
+    to_string(ConstBufferSequence const& bs)
+    {
+        using boost::asio::buffer_cast;
+        using boost::asio::buffer_size;
+        std::string s;
+        s.reserve(buffer_size(bs));
+        for(auto const& b : bs)
+            s.append(buffer_cast<char const*>(b),
+                buffer_size(b));
+        return s;
+    }
+
+    void testBuffers()
+    {
+        using boost::asio::buffer_size;
+        using boost::asio::const_buffer;
+        std::string const s = "Hello, world";
+        expect(s.size() == 12);
+        for(std::size_t x = 1; x < 4; ++x) {
+        for(std::size_t y = 1; y < 4; ++y) {
+        std::size_t z = s.size() - (x + y);
+        {
+            std::array<const_buffer, 3> bs{{
+                const_buffer{&s[0], x},
+                const_buffer{&s[x], y},
+                const_buffer{&s[x+y], z}}};
+            for(std::size_t i = 0; i <= s.size() + 1; ++i)
+            {
+                auto pb = prepare_buffers(i, bs);
+                expect(to_string(pb) == s.substr(0, i));
+                auto pb2 = pb;
+                expect(to_string(pb2) == to_string(pb));
+                pb = prepare_buffers(0, bs);
+                pb2 = pb;
+                expect(buffer_size(pb2) == 0);
+                pb2 = prepare_buffers(i, bs);
+                expect(to_string(pb2) == s.substr(0, i));
+            }
+        }
+        }}
+    }
+
+    void testNullBuffers()
+    {
+        using boost::asio::buffer_copy;
+        using boost::asio::buffer_size;
+        using boost::asio::null_buffers;
+        auto pb0 = prepare_buffers(0, null_buffers{});
+        expect(buffer_size(pb0) == 0);
+        auto pb1 = prepare_buffers(1, null_buffers{});
+        expect(buffer_size(pb1) == 0);
+        expect(buffer_copy(pb0, pb1) == 0);
+
+        using pb_type = decltype(pb0);
+        consuming_buffers<pb_type> cb(pb0);
+        expect(buffer_size(cb) == 0);
+        expect(buffer_copy(cb, pb1) == 0);
+        cb.consume(1);
+        expect(buffer_size(cb) == 0);
+        expect(buffer_copy(cb, pb1) == 0);
+
+        auto pbc = prepare_buffers(2, cb);
+        expect(buffer_size(pbc) == 0);
+        expect(buffer_copy(pbc, cb) == 0);
+    }
+
+    void testIterator()
+    {
+        using boost::asio::const_buffer;
+        char b[3];
+        std::array<const_buffer, 3> bs{{
+            const_buffer{&b[0], 1},
+            const_buffer{&b[1], 1},
+            const_buffer{&b[2], 1}}};
+        auto pb = prepare_buffers(2, bs);
+        std::size_t n = 0;
+        for(auto it = pb.end(); it != pb.begin(); --it)
+            ++n;
+        expect(n == 2);
+    }
+
+    void run() override
+    {
+        testBuffers();
+        testNullBuffers();
+        testIterator();
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(prepare_buffers,core,beast);
+
+} // beast