mirror of
https://github.com/boostorg/optional.git
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117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
// Copyright (C) 2016 Andrzej Krzemienski.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 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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//
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// See http://www.boost.org/lib/optional for documentation.
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//
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// You are welcome to contact the author at:
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// akrzemi1@gmail.com
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#include "boost/optional/optional.hpp"
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#ifdef BOOST_BORLANDC
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#pragma hdrstop
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#endif
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#include "boost/core/lightweight_test.hpp"
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using boost::optional;
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using boost::none;
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struct Value
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{
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int val;
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explicit Value(int v) : val(v) {}
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};
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int val(int const& i)
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{
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return i;
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}
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int val(Value const& v)
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{
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return v.val;
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}
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template <typename Tref>
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optional<Tref&> make_opt_ref(Tref& v)
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{
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return optional<Tref&>(v);
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}
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template <typename Tval, typename Tref>
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void test_construct_from_optional_ref()
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{
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Tref v1 (1), v2 (2);
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optional<Tref&> opt_ref0;
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optional<Tref&> opt_ref1 (v1);
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optional<Tval> opt_val0 (opt_ref0);
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optional<Tval> opt_val1 (opt_ref1);
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optional<Tval> opt_val2 (make_opt_ref(v2));
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BOOST_TEST (!opt_val0);
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BOOST_TEST (opt_val1);
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BOOST_TEST (opt_val2);
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BOOST_TEST_EQ (1, val(*opt_val1));
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BOOST_TEST_EQ (2, val(*opt_val2));
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BOOST_TEST (boost::addressof(*opt_val1) != boost::addressof(v1));
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BOOST_TEST (boost::addressof(*opt_val2) != boost::addressof(v2));
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}
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template <typename Tval, typename Tref>
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void test_assign_from_optional_ref()
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{
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Tref v1 (1), v2 (2);
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optional<Tref&> opt_ref0;
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optional<Tref&> opt_ref1 (v1);
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optional<Tval> opt_val0;
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optional<Tval> opt_val1;
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optional<Tval> opt_val2;
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opt_val0 = opt_ref0;
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opt_val1 = opt_ref1;
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opt_val2 = make_opt_ref(v2);
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BOOST_TEST (!opt_val0);
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BOOST_TEST (opt_val1);
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BOOST_TEST (opt_val2);
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BOOST_TEST_EQ (1, val(*opt_val1));
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BOOST_TEST_EQ (2, val(*opt_val2));
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BOOST_TEST (boost::addressof(*opt_val1) != boost::addressof(v1));
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BOOST_TEST (boost::addressof(*opt_val2) != boost::addressof(v2));
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}
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int main()
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{
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test_construct_from_optional_ref<int, int>();
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test_construct_from_optional_ref<int, int const>();
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test_construct_from_optional_ref<int const, int const>();
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test_construct_from_optional_ref<int const, int>();
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test_construct_from_optional_ref<Value, Value>();
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test_construct_from_optional_ref<Value, Value const>();
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test_construct_from_optional_ref<Value const, Value const>();
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test_construct_from_optional_ref<Value const, Value>();
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test_assign_from_optional_ref<int, int>();
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test_assign_from_optional_ref<int, int const>();
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test_assign_from_optional_ref<Value, Value>();
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test_assign_from_optional_ref<Value, Value const>();
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return boost::report_errors();
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}
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