Add string_param

fix #451

test/core/string_param.cpp

@@ -0,0 +1,44 @@
+//
+// Copyright (c) 2013-2017 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/string_param.hpp>
+
+#include <beast/unit_test/suite.hpp>
+#include <beast/core/detail/type_traits.hpp>
+
+namespace beast {
+
+class string_param_test : public unit_test::suite
+{
+public:
+    struct nop {};
+
+    static_assert(! std::is_constructible<string_param, nop>::value, "");
+
+    void
+    check(string_param const& v, string_view s)
+    {
+        BEAST_EXPECT(v.str() == s);
+    }
+
+    void
+    run() override
+    {
+        check(std::string("hello"), "hello");
+        check("xyz", "xyz");
+        check(1, "1");
+        check(12, "12");
+        check(123, "123");
+        check(1234, "1234");
+        check(12345, "12345");
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(string_param,core,beast);
+
+} // beast