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Lorenzo Caminiti
276
test/public_function/contracts-old_value_bug.hpp
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276
test/public_function/contracts-old_value_bug.hpp
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#ifndef BOOST_CONTRACT_TEST_PUBLIC_FUNCTION_CONTRACTS_HPP_
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#define BOOST_CONTRACT_TEST_PUBLIC_FUNCTION_CONTRACTS_HPP_
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// Copyright (C) 2008-2016 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0 (see accompanying
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// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
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// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
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// Test public member function subcontracting (also with old and return values).
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#include "../detail/oteststream.hpp"
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#include "../detail/counter.hpp"
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#include <boost/contract/public_function.hpp>
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#include <boost/contract/base_types.hpp>
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#include <boost/contract/assert.hpp>
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#include <boost/contract/old.hpp>
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#include <boost/contract/check.hpp>
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#include <boost/contract/override.hpp>
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#include <string>
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boost::contract::test::detail::oteststream out;
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struct s_tag;
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typedef boost::contract::test::detail::counter<s_tag, std::string> s_type;
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struct except_error {};
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struct result_type {
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std::string value;
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explicit result_type(std::string const& s) : value(s) {}
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private: // Test non-copyable and non-default-constructible result.
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result_type();
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result_type(result_type const&);
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result_type& operator=(result_type const&);
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};
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// Test base without additional bases and pure virtual.
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template<char Id>
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struct t {
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static void static_invariant() { out << Id << "::static_inv" << std::endl; }
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void invariant() const {
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out << Id << "::inv" << std::endl;
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BOOST_CONTRACT_ASSERT(z.value != "");
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}
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struct z_tag;
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typedef boost::contract::test::detail::counter<z_tag, std::string> z_type;
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z_type z;
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t() { z.value.push_back(Id); }
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virtual result_type& f(s_type& s, boost::contract::virtual_* v = 0) = 0;
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};
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template<char Id> // Requires: Only pass lower case Id so it'll never be 'X'.
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result_type& t<Id>::f(s_type& s, boost::contract::virtual_* v) {
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std::ostringstream r; r << "none-" << Id;
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static result_type result(r.str());
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boost::contract::old_ptr<z_type> old_z =
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BOOST_CONTRACT_OLD(v, z_type::eval(z));
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boost::contract::old_ptr<s_type> old_s;
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boost::contract::check c = boost::contract::public_function(v, result, this)
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.precondition([&] {
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out << Id << "::f::pre" << std::endl;
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BOOST_CONTRACT_ASSERT(s.value[0] == Id || s.value[0] == 'X');
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})
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.old([&] {
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out << Id << "::f::old" << std::endl;
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old_s = BOOST_CONTRACT_OLD(v, s_type::eval(s));
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})
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.postcondition([&] (result_type const& result) {
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out << Id << "::f::post" << std::endl;
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BOOST_CONTRACT_ASSERT(z.value == old_z->value + old_s->value);
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std::clog << Id << "::f::post OUT" << std::endl;
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BOOST_CONTRACT_ASSERT(s.value.find(old_z->value) !=
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std::string::npos);
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BOOST_CONTRACT_ASSERT(result.value == old_s->value);
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})
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.except([&] {
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out << Id << "::f::except" << std::endl;
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BOOST_CONTRACT_ASSERT(z.value == old_z->value);
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BOOST_CONTRACT_ASSERT(s.value == old_s->value);
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})
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;
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out << "t<" << Id << ">::f::body" << std::endl;
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if(s.value == "X") throw except_error();
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return result;
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}
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struct u {
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u() { std::cout << "!!!!! u default ctor" << std::endl; }
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u(u const&) { std::cout << "!!!!! u copy ctor" << std::endl; }
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~u() { std::cout << "!!!!! u dtor" << std::endl; }
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private:
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u& operator=(u const&);
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};
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// Test base with other bases, multiple inheritance, and no subcontracting from
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// protected and private bases (even if fully contracted).
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struct c
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#define BASES public t<'d'>, protected t<'p'>, private t<'q'>, public t<'e'>
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: BASES
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{
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typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
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#undef BASES
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static void static_invariant() { out << "c::static_inv" << std::endl; }
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void invariant() const {
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out << "c::inv" << std::endl;
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BOOST_CONTRACT_ASSERT(y.value != "");
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}
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struct y_tag;
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typedef boost::contract::test::detail::counter<y_tag, std::string> y_type;
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y_type y;
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c() : uu() { y.value = "c"; }
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u uu;
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virtual result_type& f(s_type& s, boost::contract::virtual_* v = 0)
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/* override */ {
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static result_type result("none-c");
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boost::contract::old_ptr<y_type> old_y =
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BOOST_CONTRACT_OLD(v, y_type::eval(y));
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boost::contract::old_ptr<s_type> old_s;
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boost::contract::old_ptr<u> old_u;
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boost::contract::check c = boost::contract::public_function<
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override_f>(v, result, &c::f, this, s)
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.precondition([&] {
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out << "c::f::pre" << std::endl;
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BOOST_CONTRACT_ASSERT(s.value == "C" || s.value == "X");
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})
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.old([&] {
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out << "c::f::old" << std::endl;
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old_s = BOOST_CONTRACT_OLD(v, s_type::eval(s));
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old_u = BOOST_CONTRACT_OLD(v, uu);
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})
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.postcondition([&] (result_type const& result) {
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out << "c::f::post" << std::endl;
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std::clog << "c::f::post OUT" << std::endl;
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BOOST_CONTRACT_ASSERT(y.value == old_y->value + old_s->value);
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BOOST_CONTRACT_ASSERT(s.value.find(old_y->value) !=
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std::string::npos);
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BOOST_CONTRACT_ASSERT(result.value == old_s->value);
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})
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.except([&] {
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out << "c::f::except" << std::endl;
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BOOST_CONTRACT_ASSERT(y.value == old_y->value);
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BOOST_CONTRACT_ASSERT(s.value == old_s->value);
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})
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;
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out << "c::f::body" << std::endl;
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if(s.value == "X") throw except_error();
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std::string save_s = s.value;
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std::string save = y.value;
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y.value += save_s;
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s.value = save;
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save = t<'d'>::z.value;
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t<'d'>::z.value += save_s;
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s.value += save;
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save = t<'e'>::z.value;
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t<'e'>::z.value += save_s;
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s.value += save;
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result.value = save_s;
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return result;
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}
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BOOST_CONTRACT_OVERRIDE(f)
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};
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// Test no subcontracting from not (fully) contracted base.
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struct b {
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static void static_invariant() { out << "b::static_inv" << std::endl; }
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void invariant() const { out << "b::inv" << std::endl; }
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virtual ~b() {}
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// No contract (no virtual_ so this is not actually overridden by a::f).
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virtual result_type& f(s_type& s) {
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static result_type result("none-b");
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out << "b::f::body" << std::endl;
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result.value = s.value;
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return result;
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}
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};
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// Test public function with both non-contracted and contracted bases.
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struct a
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#define BASES public b, public c
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: BASES
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{
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typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
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#undef BASES
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static void static_invariant() { out << "a::static_inv" << std::endl; }
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void invariant() const {
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out << "a::inv" << std::endl;
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BOOST_CONTRACT_ASSERT(x.value != "");
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}
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struct x_tag;
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typedef boost::contract::test::detail::counter<x_tag, std::string> x_type;
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x_type x;
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a() { x.value = "a"; }
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// Must use virtual_ even if no longer decl virtual for correct overloading.
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result_type& f(s_type& s, boost::contract::virtual_* v = 0)
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/* override */ {
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static result_type result("none-a");
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boost::contract::old_ptr<x_type> old_x =
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BOOST_CONTRACT_OLD(v, x_type::eval(x));
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boost::contract::old_ptr<s_type> old_s;
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boost::contract::check c = boost::contract::public_function<
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override_f>(v, result, &a::f, this, s)
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.precondition([&] {
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out << "a::f::pre" << std::endl;
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BOOST_CONTRACT_ASSERT(s.value == "A" || s.value == "X");
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})
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.old([&] {
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out << "a::f::old" << std::endl;
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old_s = BOOST_CONTRACT_OLD(v, s_type::eval(s));
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})
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.postcondition([&] (result_type const& result) {
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out << "a::f::post" << std::endl;
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BOOST_CONTRACT_ASSERT(x.value == old_x->value + old_s->value);
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BOOST_CONTRACT_ASSERT(s.value.find(old_x->value) !=
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std::string::npos);
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BOOST_CONTRACT_ASSERT(result.value == old_s->value);
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})
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.except([&] {
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out << "a::f::except" << std::endl;
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BOOST_CONTRACT_ASSERT(x.value == old_x->value);
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BOOST_CONTRACT_ASSERT(s.value == old_s->value);
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})
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;
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out << "a::f::body" << std::endl;
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if(s.value == "X") throw except_error();
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std::string save_s = s.value;
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std::string save = x.value;
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x.value += save_s;
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s.value = save;
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save = y.value;
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y.value += save_s;
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s.value += save;
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save = t<'d'>::z.value;
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t<'d'>::z.value += save_s;
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s.value += save;
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save = t<'e'>::z.value;
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t<'e'>::z.value += save_s;
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s.value += save;
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result.value = save_s;
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return result;
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}
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BOOST_CONTRACT_OVERRIDE(f)
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};
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#endif // #include guard
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