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

namespace leaf = boost::leaf;

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

leaf::error_id g()
{
	auto propagate = leaf::accumulate( [ ](info<1> & x) {++x.value;} );
	return leaf::new_error();
}

leaf::error_id f()
{
	auto propagate = leaf::accumulate( [ ](info<1> & x) {++x.value;}, [ ](info<2> & x) {++x.value;} );
	return g();
}

int main()
{
	int r = leaf::handle_all(
		[ ]() -> leaf::result<int>
		{
			return f();
		},
		[ ]( info<1> const & a, info<2> const & b )
		{
			BOOST_TEST_EQ(a.value, 2);
			BOOST_TEST_EQ(b.value, 1);
			return 1;
		},
		[ ]
		{
			return 2;
		} );
	BOOST_TEST_EQ(r, 1);
	return boost::report_errors();
}