Beast.WebSocket:

Beast.WebSocket provides developers with a robust WebSocket
implementation built on Boost.Asio with a consistent asynchronous
model using a modern C++ approach.

test/static_streambuf.cpp

@@ -0,0 +1,113 @@
+//
+// 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/asio/static_streambuf.h>
+
+#include <beast/unit_test/suite.h>
+#include <boost/asio/buffer.hpp>
+#include <string>
+
+namespace beast {
+namespace asio {
+namespace test {
+
+class static_streambuf_test : public 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 testStaticStreambuf()
+    {
+        using boost::asio::buffer;
+        using boost::asio::buffer_cast;
+        using boost::asio::buffer_size;
+        char buf[12];
+        std::string const s = "Hello, world";
+        expect(s.size() == sizeof(buf));
+        for(std::size_t i = 1; i < 4; ++i) {
+        for(std::size_t j = 1; j < 4; ++j) {
+        for(std::size_t x = 1; x < 4; ++x) {
+        for(std::size_t y = 1; y < 4; ++y) {
+        for(std::size_t t = 1; t < 4; ++ t) {
+        for(std::size_t u = 1; u < 4; ++ u) {
+        std::size_t z = sizeof(buf) - (x + y);
+        std::size_t v = sizeof(buf) - (t + u);
+        {
+            std::memset(buf, 0, sizeof(buf));
+            static_streambuf_n<sizeof(buf)> ba;
+            decltype(ba)::mutable_buffers_type d;
+            d = ba.prepare(z); expect(buffer_size(d) == z);
+            d = ba.prepare(0); expect(buffer_size(d) == 0);
+            d = ba.prepare(y); expect(buffer_size(d) == y);
+            d = ba.prepare(x); expect(buffer_size(d) == x);
+            ba.commit(buffer_copy(d, buffer(s.data(), x)));
+            expect(ba.size() == x);
+            expect(buffer_size(ba.data()) == ba.size());
+            d = ba.prepare(x); expect(buffer_size(d) == x);
+            d = ba.prepare(0); expect(buffer_size(d) == 0);
+            d = ba.prepare(z); expect(buffer_size(d) == z);
+            d = ba.prepare(y); expect(buffer_size(d) == y);
+            ba.commit(buffer_copy(d, buffer(s.data()+x, y)));
+            ba.commit(1);
+            expect(ba.size() == x + y);
+            expect(buffer_size(ba.data()) == ba.size());
+            d = ba.prepare(x); expect(buffer_size(d) == x);
+            d = ba.prepare(y); expect(buffer_size(d) == y);
+            d = ba.prepare(0); expect(buffer_size(d) == 0);
+            d = ba.prepare(z); expect(buffer_size(d) == z);
+            ba.commit(buffer_copy(d, buffer(s.data()+x+y, z)));
+            ba.commit(2);
+            expect(ba.size() == x + y + z);
+            expect(buffer_size(ba.data()) == ba.size());
+            expect(to_string(ba.data()) == s);
+            ba.consume(t);
+            d = ba.prepare(0); expect(buffer_size(d) == 0);
+            expect(to_string(ba.data()) == s.substr(t, std::string::npos));
+            ba.consume(u);
+            expect(to_string(ba.data()) == s.substr(t + u, std::string::npos));
+            ba.consume(v);
+            expect(to_string(ba.data()) == "");
+            ba.consume(1);
+            d = ba.prepare(0); expect(buffer_size(d) == 0);
+            try
+            {
+                ba.prepare(1);
+                fail();
+            }
+            catch(...)
+            {
+                pass();
+            }
+        }
+        }}}}}}
+    }
+
+    void run() override
+    {
+        testStaticStreambuf();
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(static_streambuf,asio,beast);
+
+} // test
+} // asio
+} // beast