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// Copyright 2014 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 PPAPI_CPP_DEV_STRUCT_WRAPPER_OUTPUT_TRAITS_DEV_
#define PPAPI_CPP_DEV_STRUCT_WRAPPER_OUTPUT_TRAITS_DEV_
namespace pp {
namespace internal {
// This class is used as the base class for CallbackOutputTraits specialized for
// C struct wrappers.
template <typename T>
struct StructWrapperOutputTraits {
typedef typename T::CType* APIArgType;
typedef T StorageType;
// Returns the underlying C struct of |t|, which can be passed to the browser
// as an output parameter.
static inline APIArgType StorageToAPIArg(StorageType& t) {
return t.StartRawUpdate();
}
// For each |t| passed into StorageToAPIArg(), this method must be called
// exactly once in order to match StartRawUpdate() and EndRawUpdate().
static inline T& StorageToPluginArg(StorageType& t) {
t.EndRawUpdate();
return t;
}
static inline void Initialize(StorageType* /* t */) {}
};
} // namespace internal
} // namespace pp
#endif // PPAPI_CPP_DEV_STRUCT_WRAPPER_OUTPUT_TRAITS_DEV_
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