forked from boostorg/core
102 lines
1.9 KiB
C++
102 lines
1.9 KiB
C++
// Copyright David Abrahams and Aleksey Gurtovoy
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// 2002-2004. Distributed under the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// run-time test for "boost/ref.hpp" header content
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// see 'ref_ct_test.cpp' for compile-time part
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#include <boost/ref.hpp>
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#include <boost/core/lightweight_test.hpp>
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namespace {
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using namespace boost;
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template <class T>
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struct ref_wrapper
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{
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// Used to verify implicit conversion
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static T* get_pointer(T& x)
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{
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return &x;
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}
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static T const* get_const_pointer(T const& x)
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{
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return &x;
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}
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template <class Arg>
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static T* passthru(Arg x)
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{
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return get_pointer(x);
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}
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template <class Arg>
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static T const* cref_passthru(Arg x)
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{
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return get_const_pointer(x);
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}
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static void test(T x)
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{
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BOOST_TEST(passthru(ref(x)) == &x);
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BOOST_TEST(&ref(x).get() == &x);
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BOOST_TEST(cref_passthru(cref(x)) == &x);
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BOOST_TEST(&cref(x).get() == &x);
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}
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};
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struct copy_counter {
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static int count_;
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copy_counter(copy_counter const& /*other*/) {
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++count_;
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}
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copy_counter() {}
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static void reset() { count_ = 0; }
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static int count() { return copy_counter::count_; }
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};
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int copy_counter::count_ = 0;
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} // namespace unnamed
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template <class T>
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void do_unwrap(T t) {
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/* typename unwrap_reference<T>::type& lt = */
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unwrap_ref(t);
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}
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void unwrap_test() {
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int i = 3;
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const int ci = 2;
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do_unwrap(i);
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do_unwrap(ci);
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do_unwrap(ref(i));
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do_unwrap(cref(ci));
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do_unwrap(ref(ci));
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copy_counter cc;
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BOOST_TEST(cc.count() == 0);
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do_unwrap(cc);
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do_unwrap(ref(cc));
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do_unwrap(cref(cc));
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BOOST_TEST(cc.count() == 1);
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BOOST_TEST(unwrap_ref(ref(cc)).count() == 1);
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}
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int main()
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{
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ref_wrapper<int>::test(1);
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ref_wrapper<int const>::test(1);
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unwrap_test();
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return boost::report_errors();
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}
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