delete folly/experimental/coro/Wait.h

Summary:
This code is not used anywhere, and does not currently build.
`operator delete()` was calling `folly_coro_async_malloc()` with the wrong
number of arguments.  Presumably it meant to actually call
`folly_coro_async_free()`.

Reviewed By: yfeldblum, iahs

Differential Revision: D32824148

fbshipit-source-id: bf4266cd33ecc39539dc5fdafd761d8f56d6060d

folly/experimental/coro/Wait.h

-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include <future>
-
-#include <folly/experimental/coro/Coroutine.h>
-
-#if FOLLY_HAS_COROUTINES
-
-namespace folly {
-namespace coro {
-
-class Wait {
- public:
-  class promise_type {
-   public:
-    static void* operator new(std::size_t size) {
-      return ::folly_coro_async_malloc(size);
-    }
-
-    void operator delete(void* ptr, std::size_t size) {
-      ::folly_coro_async_malloc(ptr, size);
-    }
-
-    Wait get_return_object() { return Wait(promise_.get_future()); }
-
-    suspend_never initial_suspend() noexcept { return {}; }
-
-    suspend_never final_suspend() noexcept { return {}; }
-
-    void return_void() { promise_.set_value(); }
-
-    void unhandled_exception() {
-      promise_.set_exception(std::current_exception());
-    }
-
-   private:
-    std::promise<void> promise_;
-  };
-
-  explicit Wait(std::future<void> future) : future_(std::move(future)) {}
-
-  Wait(Wait&&) = default;
-
-  void detach() { future_ = {}; }
-
-  ~Wait() {
-    if (future_.valid()) {
-      future_.get();
-    }
-  }
-
- private:
-  std::future<void> future_;
-};
-} // namespace coro
-} // namespace folly
-
-#endif // FOLLY_HAS_COROUTINES