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// Copyright (C) 2018 Andrzej Krzemienski.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// akrzemi1@gmail.com
#include "boost/optional/optional.hpp"
#ifdef BOOST_BORLANDC
#pragma hdrstop
#endif
#include "boost/core/ignore_unused.hpp"
#include "boost/core/is_same.hpp"
#include "boost/core/lightweight_test.hpp"
#include "boost/core/lightweight_test_trait.hpp"
using boost::optional;
using boost::make_optional;
using boost::core::is_same;
template <typename Expected, typename Deduced>
void verify_type(Deduced)
{
BOOST_TEST_TRAIT_TRUE(( is_same<Expected, Deduced> ));
}
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
struct MoveOnly
{
int value;
explicit MoveOnly(int i) : value(i) {}
MoveOnly(MoveOnly && r) : value(r.value) { r.value = 0; }
MoveOnly& operator=(MoveOnly && r) { value = r.value; r.value = 0; return *this; }
private:
MoveOnly(MoveOnly const&);
void operator=(MoveOnly const&);
};
MoveOnly makeMoveOnly(int i)
{
return MoveOnly(i);
}
optional<MoveOnly> makeOptMoveOnly(int i)
{
return optional<MoveOnly>(MoveOnly(i));
}
int get_val(MoveOnly m)
{
return m.value;
}
void test_map_move_only()
{
optional<MoveOnly> om (makeMoveOnly(7)), om2 (makeMoveOnly(8));
verify_type<optional<int> >(boost::move(om).map(get_val));
optional<int> oi = boost::move(om2).map(get_val);
BOOST_TEST(bool(oi));
BOOST_TEST_EQ(8, *oi);
optional<int> oj = makeOptMoveOnly(4).map(get_val);
BOOST_TEST(bool(oj));
BOOST_TEST_EQ(4, *oj);
optional<MoveOnly> o_;
optional<int> oi_ = boost::move(o_).map(get_val);
BOOST_TEST(!oi_);
}
#endif // no rvalue refs
struct Int
{
int i;
explicit Int(int i_) : i(i_) {}
};
struct convert_t
{
typedef Int result_type;
Int operator()(int i) { return Int(i); }
};
int& get_int_ref(Int& i)
{
return i.i;
}
struct get_ref
{
typedef int& result_type;
int& operator()(int& i) { return i; }
};
void test_map()
{
optional<int> oi (1);
verify_type<optional<Int> >(oi.map(convert_t()));
optional<Int> oI = oi.map(convert_t());
BOOST_TEST(bool(oI));
BOOST_TEST_EQ(1, oI->i);
optional<Int> o_ = optional<int>().map(convert_t());
BOOST_TEST(!o_);
}
optional<Int> make_opt_int(int i)
{
if (i != 0)
return Int(i);
else
return boost::none;
}
void test_map_optional()
{
optional<int> o9 (9), o0 (0), o_;
verify_type<optional<optional<Int> > >(o9.map(make_opt_int));
optional<optional<Int> > oo9 = o9.map(make_opt_int);
BOOST_TEST(bool(oo9));
BOOST_TEST(bool(*oo9));
BOOST_TEST_EQ(9, (**oo9).i);
optional<optional<Int> > oo0 = o0.map(make_opt_int);
BOOST_TEST(bool(oo0));
BOOST_TEST(!*oo0);
optional<optional<Int> > oo_ = o_.map(make_opt_int);
BOOST_TEST(!oo_);
}
void test_map_with_lambda()
{
#if !defined BOOST_NO_CXX11_LAMBDAS && !defined BOOST_NO_CXX11_DECLTYPE_N3276
optional<int> oi (1), oj(2);
verify_type<optional<bool> >(oi.map([](int i){ return i == 1; }));
optional<bool> ob = oi.map([](int i){ return i == 1; });
optional<bool> oc = oj.map([](int i){ return i == 1; });
BOOST_TEST(bool(ob));
BOOST_TEST_EQ(true, *ob);
BOOST_TEST(bool(oc));
BOOST_TEST_EQ(false, *oc);
#endif // lambdas
}
void test_map_to_ref()
{
optional<int> oi (2);
verify_type<optional<int&> >(oi.map(get_ref()));
optional<int&> ori = oi.map(get_ref());
BOOST_TEST(bool(ori));
*ori = 3;
BOOST_TEST(bool(oi));
BOOST_TEST_EQ(3, *oi);
BOOST_TEST_EQ(3, *ori);
}
void test_map_optional_ref()
{
Int I (5);
optional<Int&> ori (I);
verify_type<optional<int&> >(ori.map(get_int_ref));
optional<int&> orii = ori.map(get_int_ref);
BOOST_TEST(bool(orii));
BOOST_TEST_EQ(5, *orii);
*orii = 6;
BOOST_TEST_EQ(6, I.i);
}
int main()
{
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
test_map_move_only();
#endif
test_map_with_lambda();
test_map();
test_map_optional();
test_map_to_ref();
test_map_optional();
test_map_optional_ref();
return boost::report_errors();
}
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