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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11
// REQUIRES: fcoroutines-ts
// RUN: %build -fcoroutines-ts
// RUN: %run
#include <experimental/coroutine>
#include <cassert>
using namespace std::experimental;
struct error {};
template <typename T, typename Error = int>
struct expected {
struct Data {
T val;
Error error;
};
Data data;
struct DataPtr {
Data *p;
~DataPtr() { delete p; }
};
expected() {}
expected(T val) : data{std::move(val),{}} {}
expected(struct error, Error error) : data{{}, std::move(error)} {}
expected(DataPtr & p) : data{std::move(p.p->val), std::move(p.p->error)} {}
struct promise_type {
Data* data;
DataPtr get_return_object() { data = new Data{}; return {data}; }
suspend_never initial_suspend() { return {}; }
suspend_never final_suspend() { return {}; }
void return_value(T v) { data->val = std::move(v); data->error = {};}
void unhandled_exception() {}
};
bool await_ready() { return !data.error; }
T await_resume() { return std::move(data.val); }
void await_suspend(coroutine_handle<promise_type> h) {
h.promise().data->error =std::move(data.error);
h.destroy();
}
T const& value() { return data.val; }
Error const& error() { return data.error; }
};
expected<int> g() { return {0}; }
expected<int> h() { return {error{}, 42}; }
extern "C" void print(int);
bool f1_started, f1_resumed = false;
expected<int> f1() {
f1_started = true;
(void)(co_await g());
f1_resumed = true;
co_return 100;
}
bool f2_started, f2_resumed = false;
expected<int> f2() {
f2_started = true;
(void)(co_await h());
f2_resumed = true;
co_return 200;
}
int main() {
auto c1 = f1();
assert(f1_started && f1_resumed);
assert(c1.value() == 100);
assert(c1.error() == 0);
auto c2 = f2();
assert(f2_started && !f2_resumed);
assert(c2.value() == 0);
assert(c2.error() == 42);
}
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