leaf/test/error_test.cpp

//Copyright (c) 2018 Emil Dotchevski
//Copyright (c) 2018 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/expect.hpp>
#include <boost/detail/lightweight_test.hpp>

namespace leaf = boost::leaf;

template <int A>
struct
info
	{
	int value;
	};
leaf::error
f1()
	{
	return leaf::error( info<1>{1} );
	}
leaf::error
f2()
	{
	leaf::expect<info<1>> exp;
	leaf::error e=f1();
	BOOST_TEST(*leaf::current_error()==e);
	return e.propagate( info<2>{2} );
	}
leaf::error
f3()
	{
	leaf::expect<info<2>,info<3>> exp;
	leaf::error e=f2();
	BOOST_TEST(*leaf::current_error()==e);
	return e.propagate( info<4>{4} );
	}
leaf::error
f4()
	{
	leaf::expect<info<1>,info<2>,info<3>,info<4>> exp;
	leaf::error e=f3();
	BOOST_TEST(*leaf::current_error()==e);
	int c1=0, c2=0;
	handle_error( exp, e,
		leaf::match<info<1>,info<2>,info<3>,info<4>>( [&c1]( int, int, int, int )
			{
			++c1;
			} ),
		leaf::match<info<1>,info<2>,info<4>>( [&c2]( int i1, int i2, int i4 )
			{
			BOOST_TEST(i1==1);
			BOOST_TEST(i2==2);
			BOOST_TEST(i4==4);
			++c2;
			} ) );
	BOOST_TEST(c1==0);
	BOOST_TEST(c2==1);
	BOOST_TEST(!leaf::current_error());
	return leaf::error();
	}
int
main()
	{
	leaf::expect<info<2>,info<3>,info<4>> exp;
	leaf::error e=f4();
	BOOST_TEST(*leaf::current_error()==e);
	BOOST_TEST(!leaf::peek<info<2>>(exp,e));
	BOOST_TEST(!leaf::peek<info<3>>(exp,e));
	BOOST_TEST(!leaf::peek<info<4>>(exp,e));
	BOOST_TEST(leaf::leaf_detail::tl_slot_ptr<info<1>>()==0);
	BOOST_TEST(leaf::leaf_detail::tl_slot_ptr<info<2>>()!=0);
	BOOST_TEST(leaf::leaf_detail::tl_slot_ptr<info<3>>()!=0);
	BOOST_TEST(leaf::leaf_detail::tl_slot_ptr<info<4>>()!=0);
	return boost::report_errors();
	}