leaf/test/multiple_errors_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/handle_all.hpp>
#include <boost/leaf/result.hpp>
#include "boost/core/lightweight_test.hpp"

namespace leaf = boost::leaf;

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

leaf::result<void> f12()
{
	return leaf::new_error( info<1>{1}, info<2>{2} );
}

leaf::result<void> f23()
{
	return leaf::new_error( info<2>{2}, info<3>{3} );
}

int main()
{
	int r = leaf::handle_all(
		[ ]() -> leaf::result<int>
		{
			leaf::result<void> r1 = f12();
			(void) r1;
			leaf::result<void> r2 = f23();
			return r2.error();
		},
		[ ]( info<1> )
		{
			return 1;
		},
		[ ]( info<2> const & x, info<3> const & y )
		{
			BOOST_TEST_EQ(x.value, 2);
			BOOST_TEST_EQ(y.value, 3);
			return 2;
		},
		[ ]
		{
			return 3;
		} );
	BOOST_TEST_EQ(r, 2);
	return boost::report_errors();
}