leaf/test/match_test.cpp

// Copyright (c) 2018-2020 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/handle_error.hpp>
#include <boost/leaf/pred.hpp>
#include <exception>
#include "_test_ec.hpp"
#include "lightweight_test.hpp"

namespace leaf = boost::leaf;

enum class my_error { e1=1, e2, e3 };

struct e_my_error { my_error value; };

struct e_error_code { std::error_code value; };


struct my_exception: std::exception
{
	int value;

	my_exception():
		value(0)
	{
	}

	my_exception(int v):
		value(v)
	{
	}
};

static_assert(leaf::leaf_detail::handler_argument_traits<leaf::match_value<my_exception, 42>>::requires_catch, "requires_catch deduction error");
static_assert(!leaf::leaf_detail::handler_argument_traits<leaf::match<my_error, my_error::e1>>::requires_catch, "requires_catch deduction error");

#if __cplusplus >= 201703L
static_assert(leaf::leaf_detail::handler_argument_traits<leaf::match_member<&my_exception::value, 42>>::requires_catch, "requires_catch deduction error");
#endif

template <class M, class E>
bool test(E const * e )
{
	if( M::evaluate(e) )
	{
		M m(e);
		BOOST_TEST_EQ(e, &m.matched());
		return true;
	}
	else
		return false;
}

int main()
{
	{
		int e = 42;

		static_assert(std::is_same<int const &, leaf::match<int, 42>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match<int, 42>>(&e) ));
		BOOST_TEST(( !test<leaf::match<int, 41>>(&e) ));
		BOOST_TEST(( test<leaf::match<int, 42, 41>>(&e) ));
	}

	{
		my_error e = my_error::e1;

		static_assert(std::is_same<my_error const &, leaf::match<my_error, my_error::e1>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match<my_error, my_error::e1>>(&e) ));
		BOOST_TEST(( !test<leaf::match<my_error, my_error::e2>>(&e) ));
		BOOST_TEST(( test<leaf::match<my_error, my_error::e2, my_error::e1>>(&e) ));
	}

	{
		e_my_error e = { my_error::e1 };

		static_assert(std::is_same<e_my_error const &, leaf::match_value<e_my_error, my_error::e1>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match_value<e_my_error, my_error::e1>>(&e) ));
		BOOST_TEST(( !test<leaf::match_value<e_my_error, my_error::e2>>(&e) ));
		BOOST_TEST(( test<leaf::match_value<e_my_error, my_error::e2, my_error::e1>>(&e) ));

#if __cplusplus >= 201703L
		static_assert(std::is_same<e_my_error const &, leaf::match_member<&e_my_error::value, my_error::e1>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match_member<&e_my_error::value, my_error::e1>>(&e) ));
		BOOST_TEST(( !test<leaf::match_member<&e_my_error::value, my_error::e2>>(&e) ));
		BOOST_TEST(( test<leaf::match_member<&e_my_error::value, my_error::e2, my_error::e1>>(&e) ));
#endif
	}

	{
		std::error_code e = errc_a::a0;

		static_assert(std::is_same<std::error_code const &, leaf::match<leaf::condition<cond_x>, cond_x::x00>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match<leaf::condition<cond_x>, cond_x::x00>>(&e) ));
		BOOST_TEST(( !test<leaf::match<leaf::condition<cond_x>, cond_x::x11>>(&e) ));
		BOOST_TEST(( test<leaf::match<leaf::condition<cond_x>, cond_x::x11, cond_x::x00>>(&e) ));

#if __cplusplus >= 201703L
		static_assert(std::is_same<std::error_code const &, leaf::match<std::error_code, errc_a::a0>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match<std::error_code, errc_a::a0>>(&e) ));
		BOOST_TEST(( !test<leaf::match<std::error_code, errc_a::a2>>(&e) ));
		BOOST_TEST(( test<leaf::match<std::error_code, errc_a::a2, errc_a::a0>>(&e) ));
#endif
	}

	{
		e_error_code e = { errc_a::a0 };

		static_assert(std::is_same<e_error_code const &, leaf::match_value<leaf::condition<e_error_code, cond_x>, cond_x::x00>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match_value<leaf::condition<e_error_code, cond_x>, cond_x::x00>>(&e) ));
		BOOST_TEST(( !test<leaf::match_value<leaf::condition<e_error_code, cond_x>, cond_x::x11>>(&e) ));
		BOOST_TEST(( test<leaf::match_value<leaf::condition<e_error_code, cond_x>, cond_x::x11, cond_x::x00>>(&e) ));

#if __cplusplus >= 201703L
		static_assert(std::is_same<e_error_code const &, leaf::match_value<e_error_code, errc_a::a0>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match_value<e_error_code, errc_a::a0>>(&e) ));
		BOOST_TEST(( !test<leaf::match_value<e_error_code, errc_a::a2>>(&e) ));
		BOOST_TEST(( test<leaf::match_value<e_error_code, errc_a::a2, errc_a::a0>>(&e) ));

		static_assert(std::is_same<e_error_code const &, leaf::match_member<&e_error_code::value, errc_a::a0>::match_type>::value, "match type deduction error");
		BOOST_TEST(( test<leaf::match_member<&e_error_code::value, errc_a::a0>>(&e) ));
		BOOST_TEST(( !test<leaf::match_member<&e_error_code::value, errc_a::a2>>(&e) ));
		BOOST_TEST(( test<leaf::match_member<&e_error_code::value, errc_a::a2, errc_a::a0>>(&e) ));
#endif
	}

	return boost::report_errors();
}