leaf/test/result_load_accumulate_test.cpp

// Copyright (c) 2018-2019 Emil Dotchevski
// Copyright (c) 2018-2019 Second Spectrum, Inc.

// Distributed under 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)

#include <boost/leaf/result.hpp>
#include <boost/leaf/handle_error.hpp>
#include "boost/core/lightweight_test.hpp"

namespace leaf = boost::leaf;

template <int> struct info { int value; };

template <class T>
leaf::result<T> test()
{
	leaf::result<T> r1 = leaf::new_error(info<42>{40});
	leaf::result<T> & r2 = r1.load(info<1>{});
	leaf::result<T> & r3 = r2.load(info<2>{2}, info<3>{3});
	leaf::result<T> & r4 = r3.accumulate([ ](info<42> & x){ ++x.value; });
	leaf::result<T> & r5 = r4.accumulate([ ](info<42> & x){ ++x.value; }, [ ](info<1> & x){ ++x.value; });
	return r5;
}

int main()
{
	{
		int r = leaf::try_handle_all(
			[ ]
			{
				return test<int>();
			},
			[ ]( leaf::match<info<42>, 42>, leaf::match<info<1>, 1>, leaf::match<info<2>, 2>, leaf::match<info<3>, 3> )
			{
				return 1;
			},
			[ ]
			{
				return 2;
			} );
		BOOST_TEST_EQ(r, 1);
	}
	{
		int r = leaf::try_handle_all(
			[ ]() -> leaf::result<int>
			{
				LEAF_CHECK(test<void>());
				return 0;
			},
			[ ]( leaf::match<info<42>, 42>, leaf::match<info<1>, 1>, leaf::match<info<2>, 2>, leaf::match<info<3>, 3> )
			{
				return 1;
			},
			[ ]
			{
				return 2;
			} );
		BOOST_TEST_EQ(r, 1);
	}
	return boost::report_errors();
}