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add set_error(std::error_code) into await_transform #523

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merged 1 commit into from
May 22, 2023
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add set_error(std::error_code) into await_transform #523

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5 changes: 5 additions & 0 deletions include/unifex/await_transform.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@
#include <exception>
#include <optional>
#include <type_traits>
#include <system_error>

#include <unifex/detail/prologue.hpp>

Expand Down Expand Up @@ -110,6 +111,10 @@ struct _awaitable_base<Promise, Value>::type {
result_->state_ = _state::exception;
continuation_.resume();
}

void set_error(std::error_code code) && noexcept {
std::move(*this).set_error(std::make_exception_ptr(std::system_error{code}));
}

void set_done() && noexcept {
result_->state_ = _state::done;
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17 changes: 17 additions & 0 deletions test/awaitable_senders_test.cpp
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Expand Up @@ -19,6 +19,7 @@
#if !UNIFEX_NO_COROUTINES

#include <unifex/just.hpp>
#include <unifex/just_error.hpp>
#include <unifex/sync_wait.hpp>
#include <unifex/task.hpp>
#include <unifex/stop_when.hpp>
Expand All @@ -45,6 +46,22 @@ TEST(awaitable_senders, non_void) {
EXPECT_EQ(42, *answer);
}

#if !UNIFEX_NO_EXCEPTIONS
TEST(awaitable_senders, error_code) {
const std::error_code ec{42, std::system_category()};
auto makeTask = [&]() -> task<int> {
co_await just_error(ec);
co_return 0;
};
try {
sync_wait(makeTask());
FAIL();
} catch (const std::system_error& e) {
ASSERT_EQ(ec, e.code());
}
}
#endif // !UNIFEX_NO_EXCEPTIONS

TEST(awaitable_senders, void) {
// HACK: ideally would be task<void> once that specialisation has been added.
auto makeTask = [&]() -> task<unifex::unit> {
Expand Down