mirror of
https://github.com/boostorg/leaf.git
synced 2026-01-30 07:52:13 +00:00
91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
//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/result.hpp>
|
|
#include <boost/leaf/expect.hpp>
|
|
#include <boost/leaf/preload.hpp>
|
|
#include <boost/detail/lightweight_test.hpp>
|
|
|
|
namespace leaf = boost::leaf;
|
|
|
|
struct
|
|
my_value
|
|
{
|
|
};
|
|
template <int A>
|
|
struct
|
|
info
|
|
{
|
|
int value;
|
|
};
|
|
leaf::result<my_value>
|
|
f1( bool success )
|
|
{
|
|
if( success )
|
|
return { };
|
|
else
|
|
return leaf::error( info<1>{1} );
|
|
}
|
|
leaf::result<my_value>
|
|
f2( bool success )
|
|
{
|
|
leaf::expect<info<1>> exp;
|
|
if( leaf::result<my_value> r=f1(success) )
|
|
return r;
|
|
else
|
|
return r.error( info<2>{2} );
|
|
}
|
|
leaf::result<my_value>
|
|
f3( bool success )
|
|
{
|
|
leaf::expect<info<2>,info<3>> exp;
|
|
auto propagate = leaf::preload( info<4>{4} );
|
|
return f2(success);
|
|
}
|
|
leaf::result<my_value>
|
|
f4( bool success )
|
|
{
|
|
leaf::expect<info<1>,info<2>,info<3>,info<4>> exp;
|
|
if( leaf::result<my_value> r = f3( success ) )
|
|
return r;
|
|
else
|
|
{
|
|
int c1=0, c2=0;
|
|
BOOST_TEST( handle_error( exp, r,
|
|
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);
|
|
return leaf::error();
|
|
}
|
|
}
|
|
int
|
|
main()
|
|
{
|
|
leaf::expect<info<2>,info<3>,info<4>> exp;
|
|
BOOST_TEST(f4(true));
|
|
leaf::result<my_value> r=f4(false);
|
|
BOOST_TEST(!r);
|
|
leaf::error e = r.error();
|
|
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();
|
|
}
|