forked from boostorg/core
77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
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/*
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Copyright 2018 Glen Joseph Fernandes
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(glenjofe@gmail.com)
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Distributed under the Boost Software License, Version 1.0.
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(http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include <boost/core/empty_value.hpp>
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#include <boost/core/lightweight_test.hpp>
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struct empty {
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operator bool() const {
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return false;
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}
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operator bool() {
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return true;
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}
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};
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class type {
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public:
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type()
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: value_(false) { }
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explicit type(bool value)
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: value_(value) { }
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operator bool() const {
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return value_;
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}
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private:
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bool value_;
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};
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void test_bool()
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{
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const boost::empty_value<bool> v1(boost::empty_init_t(), true);
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BOOST_TEST(v1.get());
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boost::empty_value<bool> v2;
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BOOST_TEST(!v2.get());
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v2 = v1;
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BOOST_TEST(v2.get());
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v2.get() = false;
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BOOST_TEST(!v2.get());
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}
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void test_empty()
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{
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empty e;
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const boost::empty_value<empty> v1(boost::empty_init_t(), e);
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BOOST_TEST(!v1.get());
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boost::empty_value<empty> v2;
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BOOST_TEST(v2.get());
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v2 = v1;
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BOOST_TEST(v2.get());
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v2.get() = empty();
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BOOST_TEST(v2.get());
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}
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void test_type()
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{
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const boost::empty_value<type> v1(boost::empty_init_t(), true);
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BOOST_TEST(v1.get());
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boost::empty_value<type> v2;
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BOOST_TEST(!v2.get());
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v2 = v1;
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BOOST_TEST(v2.get());
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v2.get() = type();
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BOOST_TEST(!v2.get());
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}
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int main()
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{
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test_bool();
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test_empty();
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test_type();
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return boost::report_errors();
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}
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