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Copy pathvirtual_access_multi.cpp
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283 lines (250 loc) · 9.87 KB
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// 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 overrides with mixed access levels from different (multiple) bases.
#include <boost/config.hpp>
#ifdef BOOST_MSVC
// WARNING: MSVC (at least up to VS 2015) gives a compile-time error if SFINAE
// cannot introspect a member because of its private or protected access level.
// That is incorrect, SFINAE should fail in these cases without generating
// compile-time errors like GCC and CLang do. Therefore, currently it is not
// possible to override a member that is public in one base but private or
// protected in other base using this library on MSVC (that can be done instead
// using this library on GCC or CLang).
int main() { return 0; } // This test trivially passes on MSVC.
#else
#include "../detail/oteststream.hpp"
#include <boost/contract/public_function.hpp>
#include <boost/contract/function.hpp>
#include <boost/contract/base_types.hpp>
#include <boost/contract/override.hpp>
#include <boost/contract/check.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <sstream>
boost::contract::test::detail::oteststream out;
struct c { // Test public access different from base `b`'s access below.
static void statci_inv() { out << "c::static_inv" << std::endl; }
void invariant() const { out << "c::inv" << std::endl; }
virtual void f(boost::contract::virtual_* v = 0) {
boost::contract::check c = boost::contract::public_function(v, this)
.precondition([] { out << "c::f::pre" << std::endl; })
.old([] { out << "c::f::old" << std::endl; })
.postcondition([] { out << "c::f::post" << std::endl; })
;
out << "c::f::body" << std::endl;
}
virtual void g(boost::contract::virtual_* v = 0) {
boost::contract::check c = boost::contract::public_function(v, this)
.precondition([] { out << "c::g::pre" << std::endl; })
.old([] { out << "c::g::old" << std::endl; })
.postcondition([] { out << "c::g::post" << std::endl; })
;
out << "c::g::body" << std::endl;
}
virtual void h(boost::contract::virtual_* v = 0) {
boost::contract::check c = boost::contract::public_function(v, this)
.precondition([] { out << "c::h::pre" << std::endl; })
.old([] { out << "c::h::old" << std::endl; })
.postcondition([] { out << "c::h::post" << std::endl; })
;
out << "c::h::body" << std::endl;
}
};
struct b { // Test all access levels (public, protected, and private).
friend void call(b& me) { // Test polymorphic calls (object by &).
me.f();
me.g();
me.h();
}
static void statci_inv() { out << "b::static_inv" << std::endl; }
void invariant() const { out << "b::inv" << std::endl; }
virtual void f(boost::contract::virtual_* v = 0) {
boost::contract::check c = boost::contract::public_function(v, this)
.precondition([] { out << "b::f::pre" << std::endl; })
.old([] { out << "b::f::old" << std::endl; })
.postcondition([] { out << "b::f::post" << std::endl; })
;
out << "b::f::body" << std::endl;
}
// NOTE: Both protected and private virtual members must declare
// extra `virtual_* = 0` parameter (otherwise they cannot be overridden in
// derived classes with contracts because C++ uses also default parameters
// to match signature of overriding functions).
protected:
virtual void g(boost::contract::virtual_* /* v */ = 0) {
boost::contract::check c = boost::contract::function()
.precondition([] { out << "b::g::pre" << std::endl; })
.old([] { out << "b::g::old" << std::endl; })
.postcondition([] { out << "b::g::post" << std::endl; })
;
out << "b::g::body" << std::endl;
}
private:
virtual void h(boost::contract::virtual_* /* v */ = 0) {
boost::contract::check c = boost::contract::function()
.precondition([] { out << "b::h::pre" << std::endl; })
.old([] { out << "b::h::old" << std::endl; })
.postcondition([] { out << "b::h::post" << std::endl; })
;
out << "b::h::body" << std::endl;
}
};
struct a // Test overrides with mixed access levels from different bases.
#define BASES public b, public c
: BASES
{
typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types;
#undef BASES
static void statci_inv() { out << "a::static_inv" << std::endl; }
void invariant() const { out << "a::inv" << std::endl; }
virtual void f(boost::contract::virtual_* v = 0) /* override */ {
boost::contract::check c = boost::contract::public_function<override_f>(
v, &a::f, this)
.precondition([] { out << "a::f::pre" << std::endl; })
.old([] { out << "a::f::old" << std::endl; })
.postcondition([] { out << "a::f::post" << std::endl; })
;
out << "a::f::body" << std::endl;
}
virtual void g(boost::contract::virtual_* v = 0) /* override */ {
boost::contract::check c = boost::contract::public_function<override_g>(
v, &a::g, this)
.precondition([] { out << "a::g::pre" << std::endl; })
.old([] { out << "a::g::old" << std::endl; })
.postcondition([] { out << "a::g::post" << std::endl; })
;
out << "a::g::body" << std::endl;
}
virtual void h(boost::contract::virtual_* v = 0) /* override */ {
boost::contract::check c = boost::contract::public_function<override_h>(
v, &a::h, this)
.precondition([] { out << "a::h::pre" << std::endl; })
.old([] { out << "a::h::old" << std::endl; })
.postcondition([] { out << "a::h::post" << std::endl; })
;
out << "a::h::body" << std::endl;
}
BOOST_CONTRACT_OVERRIDES(f, g, h)
};
int main() {
std::ostringstream ok;
b bb;
out.str("");
call(bb);
ok.str(""); ok
#ifndef BOOST_CONTRACT_NO_ENTRY_INVARIANTS
<< "b::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_PRECONDITIONS
<< "b::f::pre" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_OLDS
<< "b::f::old" << std::endl
#endif
<< "b::f::body" << std::endl
#ifndef BOOST_CONTRACT_NO_EXIT_INVARIANTS
<< "b::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
<< "b::f::post" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_PRECONDITIONS
<< "b::g::pre" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_OLDS
<< "b::g::old" << std::endl
#endif
<< "b::g::body" << std::endl
#ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
<< "b::g::post" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_PRECONDITIONS
<< "b::h::pre" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_OLDS
<< "b::h::old" << std::endl
#endif
<< "b::h::body" << std::endl
#ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
<< "b::h::post" << std::endl
#endif
;
BOOST_TEST(out.eq(ok.str()));
a aa;
out.str("");
call(aa);
ok.str(""); ok
#ifndef BOOST_CONTRACT_NO_ENTRY_INVARIANTS
<< "b::inv" << std::endl
<< "c::inv" << std::endl
<< "a::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_PRECONDITIONS
<< "b::f::pre" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_OLDS
<< "b::f::old" << std::endl
<< "c::f::old" << std::endl
<< "a::f::old" << std::endl
#endif
<< "a::f::body" << std::endl
#ifndef BOOST_CONTRACT_NO_EXIT_INVARIANTS
<< "b::inv" << std::endl
<< "c::inv" << std::endl
<< "a::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
<< "b::f::old" << std::endl
<< "b::f::post" << std::endl
<< "c::f::old" << std::endl
<< "c::f::post" << std::endl
<< "a::f::post" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_ENTRY_INVARIANTS
<< "c::inv" << std::endl
<< "a::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_PRECONDITIONS
<< "c::g::pre" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_OLDS
<< "c::g::old" << std::endl
<< "a::g::old" << std::endl
#endif
<< "a::g::body" << std::endl
#ifndef BOOST_CONTRACT_NO_EXIT_INVARIANTS
<< "c::inv" << std::endl
<< "a::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
<< "c::g::old" << std::endl
<< "c::g::post" << std::endl
<< "a::g::post" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_ENTRY_INVARIANTS
<< "c::inv" << std::endl
<< "a::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_PRECONDITIONS
<< "c::h::pre" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_OLDS
<< "c::h::old" << std::endl
<< "a::h::old" << std::endl
#endif
<< "a::h::body" << std::endl
#ifndef BOOST_CONTRACT_NO_EXIT_INVARIANTS
<< "c::inv" << std::endl
<< "a::inv" << std::endl
#endif
#ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
<< "c::h::old" << std::endl
<< "c::h::post" << std::endl
<< "a::h::post" << std::endl
#endif
;
BOOST_TEST(out.eq(ok.str()));
return boost::report_errors();
}
#endif // MSVC
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