pdf/ppapi_migration/callback.h

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef PDF_PPAPI_MIGRATION_CALLBACK_H_
#define PDF_PPAPI_MIGRATION_CALLBACK_H_

#include <stdint.h>

#include "base/callback_forward.h"

namespace pp {
class CompletionCallback;
}  // namespace pp

namespace chrome_pdf {

// A `base::OnceCallback` compatible with `pp::CompletionCallback`. Accepts an
// `int32_t` result.
using ResultCallback = base::OnceCallback<void(int32_t)>;

// Adapts a `ResultCallback` to be invoked as a `pp::CompletionCallback`.
//
// Note that the `ResultCallback` will be deleted only when the
// `pp::CompletionCallback` runs. This implies that the `pp::CompletionCallback`
// must always be run exactly once.
//
// Also note that there is no replacement for `pp::CompletionCallbackFactory`;
// use a `base::WeakPtrFactory` on the receiver object instead.
pp::CompletionCallback PPCompletionCallbackFromResultCallback(
    ResultCallback callback);

}  // namespace chrome_pdf

#endif  // PDF_PPAPI_MIGRATION_CALLBACK_H_