New dynamic capture system: try_capture_all. Previous API based on make_shared_contex/capture is deprecated.

test/capture_result_async_test_.cpp

@@ -0,0 +1,162 @@
+// Copyright 2018-2023 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_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/result.hpp>
+#   include <boost/leaf/handle_errors.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<leaf::result<int>> fut;
+};
+
+template <class ErrorHandlers, 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<ErrorHandlers>(), 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 ) -> leaf::result<int>
+            {
+                if( res >= 0 )
+                    return res;
+                else
+                    return leaf::new_error( info<1>{a}, info<2>{b}, info<3>{} );
+            } );
+
+        for( auto & f : fut )
+        {
+            f.fut.wait();
+            int r = leaf::try_handle_all(
+                [&]
+                {
+                    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(f.a, received_a);
+                BOOST_TEST_EQ(f.b, received_b);
+            }
+        }
+    }
+
+    {
+        std::vector<fut_info> fut = launch_tasks<decltype(error_handlers)>(
+            100,
+            []( int a, int b, int res ) -> leaf::result<int>
+            {
+                if( res >= 0 )
+                    return res;
+                else
+                    return leaf::new_error( info<1>{a}, info<2>{b}, info<3>{} );
+            } );
+
+        for( auto & f : fut )
+        {
+            f.fut.wait();
+            int r = leaf::try_handle_all(
+                [&]
+                {
+                    auto load = leaf::on_error( info<4>{} );
+
+                    return leaf::try_handle_some(
+                        [&]
+                        {
+                            // 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();
+                        },
+                        []( leaf::error_info const & err )
+                        {
+                            return err.error();
+                        } );
+                },
+                error_handlers );
+            if( f.result>=0 )
+                BOOST_TEST_EQ(r, f.result);
+            else
+            {
+                BOOST_TEST_EQ(r, -1);
+                BOOST_TEST_EQ(f.a, received_a);
+                BOOST_TEST_EQ(f.b, received_b);
+            }
+        }
+    }
+
+    return boost::report_errors();
+}
+
+#endif