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// Copyright (C) 2014 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 __BORLANDC__
#pragma hdrstop
#endif
#include "boost/core/ignore_unused.hpp"
#include "boost/core/lightweight_test.hpp"
using boost::optional;
struct IntWrapper
{
int _i;
IntWrapper(int i) : _i(i) {}
bool operator==(IntWrapper const& rhs) const { return _i == rhs._i; }
};
template <typename T>
void test_function_value_or_for()
{
optional<T> oM0;
const optional<T> oC0;
optional<T> oM1(1);
const optional<T> oC2(2);
BOOST_TEST(oM0.value_or(5) == 5);
BOOST_TEST(oC0.value_or(5) == 5);
BOOST_TEST(oM1.value_or(5) == 1);
BOOST_TEST(oC2.value_or(5) == 2);
}
template <typename T>
void test_function_value_for()
{
optional<T> o0;
optional<T> o1(1);
const optional<T> oC(2);
try
{
T& v = o1.value();
BOOST_TEST(v == 1);
}
catch(...)
{
BOOST_TEST(false);
}
try
{
T const& v = oC.value();
BOOST_TEST(v == 2);
}
catch(...)
{
BOOST_TEST(false);
}
BOOST_TEST_THROWS(o0.value(), boost::bad_optional_access);
}
void test_function_value()
{
test_function_value_for<int>();
test_function_value_for<double>();
test_function_value_for<IntWrapper>();
}
struct FatToIntConverter
{
static int conversions;
int _val;
FatToIntConverter(int val) : _val(val) {}
operator int() const { conversions += 1; return _val; }
};
int FatToIntConverter::conversions = 0;
void test_function_value_or()
{
test_function_value_or_for<int>();
test_function_value_or_for<double>();
test_function_value_or_for<IntWrapper>();
optional<int> oi(1);
BOOST_TEST(oi.value_or(FatToIntConverter(2)) == 1);
BOOST_TEST(FatToIntConverter::conversions == 0);
oi = boost::none;
BOOST_TEST(oi.value_or(FatToIntConverter(2)) == 2);
BOOST_TEST(FatToIntConverter::conversions == 1);
}
struct FunM
{
int operator()() { return 5; }
};
struct FunC
{
int operator()() const { return 6; }
};
int funP ()
{
return 7;
}
int throw_()
{
throw int();
}
void test_function_value_or_eval()
{
optional<int> o1 = 1;
optional<int> oN;
FunM funM;
FunC funC;
BOOST_TEST_EQ(o1.value_or_eval(funM), 1);
BOOST_TEST_EQ(oN.value_or_eval(funM), 5);
BOOST_TEST_EQ(o1.value_or_eval(FunM()), 1);
BOOST_TEST_EQ(oN.value_or_eval(FunM()), 5);
BOOST_TEST_EQ(o1.value_or_eval(funC), 1);
BOOST_TEST_EQ(oN.value_or_eval(funC), 6);
BOOST_TEST_EQ(o1.value_or_eval(FunC()), 1);
BOOST_TEST_EQ(oN.value_or_eval(FunC()), 6);
BOOST_TEST_EQ(o1.value_or_eval(funP), 1);
BOOST_TEST_EQ(oN.value_or_eval(funP), 7);
#ifndef BOOST_NO_CXX11_LAMBDAS
BOOST_TEST_EQ(o1.value_or_eval([](){return 8;}), 1);
BOOST_TEST_EQ(oN.value_or_eval([](){return 8;}), 8);
#endif
try
{
BOOST_TEST_EQ(o1.value_or_eval(throw_), 1);
}
catch(...)
{
BOOST_TEST(false);
}
BOOST_TEST_THROWS(oN.value_or_eval(throw_), int);
}
const optional<std::string> makeConstOptVal()
{
return std::string("something");
}
void test_const_move()
{
std::string s5 = *makeConstOptVal();
std::string s6 = makeConstOptVal().value();
boost::ignore_unused(s5);
boost::ignore_unused(s6);
}
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
struct MoveOnly
{
explicit MoveOnly(int){}
MoveOnly(MoveOnly &&){}
void operator=(MoveOnly &&);
private:
MoveOnly(MoveOnly const&);
void operator=(MoveOnly const&);
};
optional<MoveOnly> makeMoveOnly()
{
return MoveOnly(1);
}
MoveOnly moveOnlyDefault()
{
return MoveOnly(1);
}
// compile-time test
void test_move_only_getters()
{
MoveOnly m1 = *makeMoveOnly();
MoveOnly m2 = makeMoveOnly().value();
MoveOnly m3 = makeMoveOnly().value_or(MoveOnly(1));
MoveOnly m4 = makeMoveOnly().value_or_eval(moveOnlyDefault);
boost::ignore_unused(m1);
boost::ignore_unused(m2);
boost::ignore_unused(m3);
boost::ignore_unused(m4);
}
#endif // !defined BOOST_NO_CXX11_REF_QUALIFIERS
int main()
{
test_function_value();
test_function_value_or();
test_function_value_or_eval();
test_const_move();
return boost::report_errors();
}
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