leaf/test/print_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)

#include <boost/leaf/config.hpp>

#if !BOOST_LEAF_CFG_DIAGNOSTICS || !BOOST_LEAF_CFG_STD_STRING

#include <iostream>

int main()
{
    std::cout << "Unit test not applicable." << std::endl;
    return 0;
}

#else

#ifdef BOOST_LEAF_TEST_SINGLE_HEADER
#   include "leaf.hpp"
#else
#   include <boost/leaf/detail/print.hpp>
#endif

#include <sstream>
#include <iostream>

#include "lightweight_test.hpp"

namespace leaf = boost::leaf;

struct c0
{
    friend std::ostream & operator<<( std::ostream & os, c0 const & )
    {
        return os << "info";
    }
};

struct c1
{
    int value;

    friend std::ostream & operator<<( std::ostream & os, c1 const & x )
    {
        return os << "value " << x.value;
    }
};

struct c2
{
    int value;
};

std::ostream & operator<<( std::ostream & os, c2 const & x )
{
    return os << "value " << x.value;
}

struct c3
{
    int value;
};

struct c4
{
    struct unprintable { };
    unprintable value;;
};

template <int Line, class T>
std::string print(T const & x, char const * prefix, char const * delimiter)
{
    using namespace leaf::detail;
    std::ostringstream s;
    diagnostic<T>::print(s, prefix, delimiter, x);
    diagnostic<T>::print(s, prefix, delimiter, x);
    std::string q = s.str();
    std::cout << "[LINE " << Line << "] " << q << '\n';
    return q;
}

struct my_exception: std::exception
{
    char const * what() const noexcept override { return "my_exception what"; }
};

int main()
{
    {
        std::string out = print<__LINE__>(c0{}, "Title " , ", ");
        BOOST_TEST_EQ(out, "Title c0: info, c0: info");
    }
    {
        std::string out = print<__LINE__>(c1{42}, "Title ", ", ");
        BOOST_TEST_EQ(out, "Title c1: value 42, c1: value 42");
    }
    {
        std::string out = print<__LINE__>(c2{42}, "Title ", ", ");
        BOOST_TEST_EQ(out, "Title c2: value 42, c2: value 42");
    }
    {
        std::string out = print<__LINE__>(c3{42}, "Title ", ", ");
        BOOST_TEST_EQ(out, "Title c3: 42, c3: 42");
    }
    {
        std::string out = print<__LINE__>(c4{}, "Title ", ", ");
        BOOST_TEST_EQ(out, "Title c4, c4");
    }
    {
        std::string out = print<__LINE__>(my_exception{}, "Title ", ", ");
        BOOST_TEST_EQ(out, "Title my_exception: \"my_exception what\", my_exception: \"my_exception what\"");
    }
    return boost::report_errors();
}

#endif