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+
+#ifndef BOOST_CONTRACT_TEST_PUBLIC_FUNCTION_CONTRACTS_HPP_
+#define BOOST_CONTRACT_TEST_PUBLIC_FUNCTION_CONTRACTS_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
+
+// Test public member function subcontracting (also with old and return values).
+
+#include "../detail/oteststream.hpp"
+#include "../detail/counter.hpp"
+#include <boost/contract/public_function.hpp>
+#include <boost/contract/base_types.hpp>
+#include <boost/contract/assert.hpp>
+#include <boost/contract/old.hpp>
+#include <boost/contract/check.hpp>
+#include <boost/contract/override.hpp>
+#include <boost/config.hpp>
+#include <string>
+
+boost::contract::test::detail::oteststream out;
+
+struct s_tag;
+typedef boost::contract::test::detail::counter<s_tag, std::string> s_type;
+
+struct except_error {};
+
+struct result_type {
+    std::string value;
+    explicit result_type(std::string const& s) : value(s) {}
+
+private: // Test non-copyable and non-default-constructible result.
+    result_type();
+    result_type(result_type const&);
+    result_type& operator=(result_type const&);
+};
+
+// Test base without additional bases and pure virtual.
+template<char Id>
+struct t {
+    static void static_invariant() { out << Id << "::static_inv" << std::endl; }
+    
+    void invariant() const {
+        out << Id << "::inv" << std::endl;
+        BOOST_CONTRACT_ASSERT(z.value != "");
+    }
+
+    struct z_tag;
+    typedef boost::contract::test::detail::counter<z_tag, std::string> z_type;
+    z_type z;
+
+    t() { z.value.push_back(Id); }
+
+    virtual result_type& f(s_type& s, boost::contract::virtual_* v = 0) = 0;
+};
+
+template<char Id> // Requires: Only pass lower case Id so it'll never be 'X'.
+result_type& t<Id>::f(s_type& s, boost::contract::virtual_* v) {
+    std::ostringstream r; r << "none-" << Id;
+    static result_type result(r.str());
+    boost::contract::old_ptr<z_type> old_z =
+            BOOST_CONTRACT_OLDOF(v, z_type::eval(z));
+    boost::contract::old_ptr<s_type> old_s;
+    boost::contract::check c = boost::contract::public_function(v, result, this)
+        .precondition([&] {
+            out << Id << "::f::pre" << std::endl;
+            BOOST_CONTRACT_ASSERT(s.value[0] == Id || s.value[0] == 'X');
+        })
+        .old([&] {
+            out << Id << "::f::old" << std::endl;
+            old_s = BOOST_CONTRACT_OLDOF(v, s_type::eval(s));
+        })
+        .postcondition([&] (result_type const& result) {
+            out << Id << "::f::post" << std::endl;
+            BOOST_CONTRACT_ASSERT(z.value == old_z->value + old_s->value);
+            BOOST_CONTRACT_ASSERT(s.value.find(old_z->value) !=
+                    std::string::npos);
+            BOOST_CONTRACT_ASSERT(result.value == old_s->value);
+        })
+        .except([&] {
+            out << Id << "::f::except" << std::endl;
+            BOOST_CONTRACT_ASSERT(z.value == old_z->value);
+            BOOST_CONTRACT_ASSERT(s.value == old_s->value);
+        })
+    ;
+    out << "t<" << Id << ">::f::body" << std::endl;
+    if(s.value == "X") throw except_error();
+    return result;
+}
+
+// Test base with other bases, multiple inheritance, and no subcontracting from
+// protected and private bases (even if fully contracted).
+struct c
+    #define BASES public t<'d'>, protected t<'p'>, private t<'q'>, public t<'e'>
+    : BASES
+{
+    typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
+    #undef BASES
+
+    static void static_invariant() { out << "c::static_inv" << std::endl; }
+    
+    void invariant() const {
+        out << "c::inv" << std::endl;
+        BOOST_CONTRACT_ASSERT(y.value != "");
+    }
+
+    struct y_tag;
+    typedef boost::contract::test::detail::counter<y_tag, std::string> y_type;
+    y_type y;
+
+    c() { y.value = "c"; }
+
+    virtual result_type& f(s_type& s, boost::contract::virtual_* v = 0)
+            /* override */ {
+        static result_type result("none-c");
+        boost::contract::old_ptr<y_type> old_y =
+                BOOST_CONTRACT_OLDOF(v, y_type::eval(y));
+        boost::contract::old_ptr<s_type> old_s;
+        boost::contract::check c = boost::contract::public_function<
+                override_f>(v, result, &c::f, this, s)
+            .precondition([&] {
+                out << "c::f::pre" << std::endl;
+                BOOST_CONTRACT_ASSERT(s.value == "C" || s.value == "X");
+            })
+            .old([&] {
+                out << "c::f::old" << std::endl;
+                old_s = BOOST_CONTRACT_OLDOF(v, s_type::eval(s));
+            })
+            .postcondition([&] (result_type const& result) {
+                out << "c::f::post" << std::endl;
+                BOOST_CONTRACT_ASSERT(y.value == old_y->value + old_s->value);
+                BOOST_CONTRACT_ASSERT(s.value.find(old_y->value) !=
+                        std::string::npos);
+                BOOST_CONTRACT_ASSERT(result.value == old_s->value);
+            })
+            .except([&] {
+                out << "c::f::except" << std::endl;
+                BOOST_CONTRACT_ASSERT(y.value == old_y->value);
+                BOOST_CONTRACT_ASSERT(s.value == old_s->value);
+            })
+        ;
+
+        out << "c::f::body" << std::endl;
+        if(s.value == "X") throw except_error();
+        std::string save_s = s.value;
+
+        std::string save = y.value;
+        y.value += save_s;
+        s.value = save;
+
+        save = t<'d'>::z.value;
+        t<'d'>::z.value += save_s;
+        s.value += save;
+
+        save = t<'e'>::z.value;
+        t<'e'>::z.value += save_s;
+        s.value += save;
+
+        result.value = save_s;
+        return result;
+    }
+    BOOST_CONTRACT_OVERRIDE(f)
+};
+
+// Test no subcontracting from not (fully) contracted base.
+struct b {
+    static void static_invariant() { out << "b::static_inv" << std::endl; }
+    void invariant() const { out << "b::inv" << std::endl; }
+
+    virtual ~b() {}
+
+    // No contract (no virtual_ so this is not actually overridden by a::f).
+    virtual result_type& f(s_type& s) {
+        static result_type result("none-b");
+        out << "b::f::body" << std::endl;
+        result.value = s.value;
+        return result;
+    }
+};
+
+// Test public function with both non-contracted and contracted bases.
+struct a
+    #define BASES public b, public c
+    : BASES
+{
+    typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
+    #undef BASES
+
+    static void static_invariant() { out << "a::static_inv" << std::endl; }
+    
+    void invariant() const {
+        out << "a::inv" << std::endl;
+        BOOST_CONTRACT_ASSERT(x.value != "");
+    }
+
+    struct x_tag;
+    typedef boost::contract::test::detail::counter<x_tag, std::string> x_type;
+    x_type x;
+
+    a() { x.value = "a"; }
+
+    #if defined(BOOST_GCC)
+        #pragma GCC diagnostic push
+        #pragma GCC diagnostic ignored "-Woverloaded-virtual" // For a::f.
+    #elif defined(BOOST_CLANG)
+        #pragma clang diagnostic push
+        #pragma clang diagnostic ignored "-Woverloaded-virtual" // For a::f.
+    #endif
+
+    // Must use virtual_ even if no longer decl virtual for correct overloading.
+    // NOTE: This intentionally hides but does not override `b::f` (it overrides
+    // `c::f` instead). This generates warnings on some compilers (Clang, etc.).
+    result_type& f(s_type& s, boost::contract::virtual_* v = 0)
+            /* override */ {
+        static result_type result("none-a");
+        boost::contract::old_ptr<x_type> old_x =
+                BOOST_CONTRACT_OLDOF(v, x_type::eval(x));
+        boost::contract::old_ptr<s_type> old_s;
+        boost::contract::check c = boost::contract::public_function<
+                override_f>(v, result, &a::f, this, s)
+            .precondition([&] {
+                out << "a::f::pre" << std::endl;
+                BOOST_CONTRACT_ASSERT(s.value == "A" || s.value == "X");
+            })
+            .old([&] {
+                out << "a::f::old" << std::endl;
+                old_s = BOOST_CONTRACT_OLDOF(v, s_type::eval(s));
+            })
+            .postcondition([&] (result_type const& result) {
+                out << "a::f::post" << std::endl;
+                BOOST_CONTRACT_ASSERT(x.value == old_x->value + old_s->value);
+                BOOST_CONTRACT_ASSERT(s.value.find(old_x->value) !=
+                        std::string::npos);
+                BOOST_CONTRACT_ASSERT(result.value == old_s->value);
+            })
+            .except([&] {
+                out << "a::f::except" << std::endl;
+                BOOST_CONTRACT_ASSERT(x.value == old_x->value);
+                BOOST_CONTRACT_ASSERT(s.value == old_s->value);
+            })
+        ;
+
+        out << "a::f::body" << std::endl;
+        if(s.value == "X") throw except_error();
+        std::string save_s = s.value;
+
+        std::string save = x.value;
+        x.value += save_s;
+        s.value = save;
+
+        save = y.value;
+        y.value += save_s;
+        s.value += save;
+
+        save = t<'d'>::z.value;
+        t<'d'>::z.value += save_s;
+        s.value += save;
+
+        save = t<'e'>::z.value;
+        t<'e'>::z.value += save_s;
+        s.value += save;
+
+        result.value = save_s;
+        return result;
+    }
+    BOOST_CONTRACT_OVERRIDE(f)
+
+    #if defined(BOOST_GCC)
+        #pragma GCC diagnostic pop
+    #elif defined(BOOST_CLANG)
+        #pragma clang diagnostic pop
+    #endif
+};
+    
+#endif // #include guard
+