1 files changed, 82 insertions, 0 deletions
diff --git a/src/boost/libs/contract/test/detail/oteststream.hpp b/src/boost/libs/contract/test/detail/oteststream.hpp
new file mode 100644
index 00000000..5bf5a031
--- /dev/null
+++ b/src/boost/libs/contract/test/detail/oteststream.hpp
@@ -0,0 +1,82 @@
+
+#ifndef BOOST_CONTRACT_TEST_DETAIL_OTESTSTREAM_HPP_
+#define BOOST_CONTRACT_TEST_DETAIL_OTESTSTREAM_HPP_
+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+#include <boost/iostreams/tee.hpp>
+#include <boost/iostreams/stream.hpp>
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <algorithm>
+
+namespace boost { namespace contract { namespace test { namespace detail {
+
+namespace oteststream_ {
+    struct oss_base { // Wrap oss data member for proper initialization order.
+    protected:
+        std::ostringstream oss_;
+    };
+}
+
+// Print to clog plus build internal string (using ostringstream) for checking.
+struct oteststream :
+    private oteststream_::oss_base,
+    public boost::iostreams::stream<boost::iostreams::tee_device<std::ostream,
+            std::ostringstream> >
+{
+    oteststream() :
+        oteststream_::oss_base(),
+        boost::iostreams::stream<boost::iostreams::tee_device<
+                std::ostream, std::ostringstream> >(
+            boost::iostreams::tee_device<std::ostream, std::ostringstream>(
+                    std::clog, oss_)
+        )
+    {}
+
+    std::string str() const { return oss_.str(); }
+    void str(std::string const& s) { oss_.str(s); }
+
+    bool eq(std::string const& s) { return eq(str(), s); }
+    
+    // Also display mismatching characters.
+    static bool eq(std::string const& r, std::string const& s) {
+        std::string::size_type i = 0;
+        for(; i < r.size() && i < s.size(); ++i) if(r[i] != s[i]) break;
+        if(i < r.size() || i < s.size()) {
+            std::cout << std::endl;
+            std::cout <<
+                "Error: Following strings differ at position " << i <<
+                ", because '" << r[i] << "' != '" << s[i] << "':" << std::endl
+            ;
+            std::cout << std::endl;
+            std::cout
+                << r.substr(0, i)
+                << "(((" << r[i] << ")))"
+                // Extra () to avoid clashes with MSVC min macro.
+                << r.substr((std::min)(i + 1, r.size()), r.size())
+                << std::endl
+            ;
+            std::cout << std::endl;
+            std::cout
+                << s.substr(0, i)
+                << "(((" << s[i] << ")))"
+                // Extra () to avoid clashes with MSVC min macro.
+                << s.substr((std::min)(i + 1, s.size()), s.size())
+                << std::endl
+            ;
+            std::cout << std::endl;
+            return false;
+        }
+        return true;
+    }
+};
+
+} } } } // namespace
+
+#endif // #include guard
+