update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / libs / leaf / test / defer_nested_error_result_test.cpp

// Copyright 2018-2022 Emil Dotchevski and Reverge Studios, 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)

#ifdef BOOST_LEAF_TEST_SINGLE_HEADER
#   include "leaf.hpp"
#else
#   include <boost/leaf/on_error.hpp>
#   include <boost/leaf/handle_errors.hpp>
#   include <boost/leaf/result.hpp>
#endif

#include "lightweight_test.hpp"

namespace leaf = boost::leaf;

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

leaf::error_id f0()
{
    auto load = leaf::on_error( [] { return info<0>{0}; } );
    return leaf::new_error( info<2>{2} );
}

leaf::error_id f1()
{
    auto load = leaf::on_error( [] { return info<0>{-1}; }, [] { return info<1>{1}; }, [] { return info<2>{-1}; } );
    return f0();
}

leaf::error_id f2()
{
    return f1().load( info<3>{3} );
}

int main()
{
    int r = leaf::try_handle_all(
        []() -> leaf::result<int>
        {
            return f2();
        },
        []( info<0> i0, info<1> i1, info<2> i2, info<3> i3 )
        {
            BOOST_TEST_EQ(i0.value, 0);
            BOOST_TEST_EQ(i1.value, 1);
            BOOST_TEST_EQ(i2.value, 2);
            BOOST_TEST_EQ(i3.value, 3);
            return 1;
        },
        []
        {
            return 2;
        } );
    BOOST_TEST_EQ(r, 1);

    return boost::report_errors();
}