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// Copyright 2018-2022 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 defined(BOOST_LEAF_NO_EXCEPTIONS) || defined(BOOST_LEAF_NO_THREADS) || !BOOST_LEAF_CFG_CAPTURE
#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/capture.hpp>
# include <boost/leaf/handle_errors.hpp>
# include <boost/leaf/exception.hpp>
# include <boost/leaf/on_error.hpp>
#endif
#include "lightweight_test.hpp"
#include <vector>
#include <future>
#include <iterator>
#include <algorithm>
namespace leaf = boost::leaf;
template <int> struct info { int value; };
struct fut_info
{
int a;
int b;
int result;
std::future<int> fut;
};
template <class H, class F>
std::vector<fut_info> launch_tasks( int task_count, F f )
{
BOOST_LEAF_ASSERT(task_count>0);
std::vector<fut_info> fut;
std::generate_n( std::back_inserter(fut), task_count,
[=]
{
int const a = rand();
int const b = rand();
int const res = (rand()%10) - 5;
return fut_info { a, b, res, std::async( std::launch::async,
[=]
{
return leaf::capture(leaf::make_shared_context<H>(), f, a, b, res);
} ) };
} );
return fut;
}
int main()
{
int received_a, received_b;
auto error_handlers = std::make_tuple(
[&received_a, &received_b]( info<1> const & x1, info<2> const & x2, info<4> const & )
{
received_a = x1.value;
received_b = x2.value;
return -1;
},
[]
{
return -2;
} );
{
std::vector<fut_info> fut = launch_tasks<decltype(error_handlers)>(
100,
[]( int a, int b, int res )
{
if( res >= 0 )
return res;
else
leaf::throw_exception(info<1>{a}, info<2>{b}, info<3>{});
} );
for( auto & f : fut )
{
f.fut.wait();
received_a = received_b = 0;
int r = leaf::try_catch(
[&]
{
auto load = leaf::on_error( info<4>{} );
// Calling future_get is required in order to make the on_error (above) work.
return leaf::future_get(f.fut);
},
error_handlers );
if( f.result>=0 )
BOOST_TEST_EQ(r, f.result);
else
{
BOOST_TEST_EQ(r, -1);
BOOST_TEST_EQ(received_a, f.a);
BOOST_TEST_EQ(received_b, f.b);
}
}
}
{
std::vector<fut_info> fut = launch_tasks<decltype(error_handlers)>(
100,
[]( int a, int b, int res )
{
if( res >= 0 )
return res;
else
leaf::throw_exception(info<1>{a}, info<2>{b}, info<3>{});
} );
for( auto & f : fut )
{
f.fut.wait();
received_a = received_b = 0;
int r = leaf::try_catch(
[&]
{
auto load = leaf::on_error( info<4>{} );
return leaf::try_catch(
[&]
{
// Not calling future_get, a on_error in this scope won't work correctly.
// This is to verify that the on_error in the outer scope (above) works.
return f.fut.get();
},
[]() -> int
{
throw;
} );
},
error_handlers );
if( f.result>=0 )
BOOST_TEST_EQ(r, f.result);
else
{
BOOST_TEST_EQ(r, -1);
BOOST_TEST_EQ(received_a, f.a);
BOOST_TEST_EQ(received_b, f.b);
}
}
}
return boost::report_errors();
}
#endif
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