leaf/test/e_errno_test.cpp

// Copyright 2018-2024 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/common.hpp>
#   include <boost/leaf/handle_errors.hpp>
#   include <boost/leaf/result.hpp>
#endif

#if BOOST_LEAF_CFG_STD_STRING
#   include <sstream>
#   include <iostream>
#endif

#include "lightweight_test.hpp"

namespace leaf = boost::leaf;

int main()
{
    errno = ENOENT;
#if BOOST_LEAF_CFG_STD_STRING
    std::ostringstream ss;
    ss << leaf::e_errno{};
    std::string s = ss.str();
    std::cout << s << std::endl;
#if BOOST_LEAF_CFG_STD_DIAGNOSTICS
    BOOST_TEST_NE(s.find(std::strerror(ENOENT)), std::string::npos);
#endif
#endif

    int r = leaf::try_handle_all(
        []() -> leaf::result<int>
        {
            struct reset_errno { ~reset_errno() { errno=0; } } reset;
            return leaf::new_error( leaf::e_errno{} );
        },
        []( leaf::e_errno e )
        {
            BOOST_TEST_EQ(errno, 0);
            BOOST_TEST_EQ(e.value, ENOENT);
            return 1;
        },
        []
        {
            return 2;
        } );
    BOOST_TEST_EQ(r, 1);
    return boost::report_errors();
}