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// Copyright 2013 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 MOJO_PUBLIC_CPP_BINDINGS_PASSABLE_H_
#define MOJO_PUBLIC_CPP_BINDINGS_PASSABLE_H_
#include "mojo/public/bindings/lib/bindings_internal.h"
#include "mojo/public/cpp/system/core.h"
namespace mojo {
template <typename HandleType>
class Passable {
public:
// |ptr| may be null.
explicit Passable(HandleType* ptr) : ptr_(ptr) {
}
bool is_valid() const {
return ptr_ && ptr_->is_valid();
}
HandleType get() const {
return ptr_ ? *ptr_ : HandleType();
}
HandleType release() MOJO_WARN_UNUSED_RESULT {
return ptr_ ? internal::FetchAndReset(ptr_) : HandleType();
}
ScopedHandleBase<HandleType> Pass() {
return ScopedHandleBase<HandleType>(release());
}
protected:
Passable();
// The default copy-ctor and operator= are OK.
HandleType* ptr_;
};
template <typename HandleType>
inline Passable<HandleType> MakePassable(HandleType* ptr) {
return Passable<HandleType>(ptr);
}
template <typename HandleType>
class AssignableAndPassable : public Passable<HandleType> {
public:
explicit AssignableAndPassable(HandleType* ptr) : Passable<HandleType>(ptr) {
assert(ptr);
}
void operator=(ScopedHandleBase<HandleType> scoper) {
reset(scoper.release());
}
void reset(HandleType obj = HandleType()) {
ScopedHandleBase<HandleType>(*this->ptr_);
this->ptr_->set_value(obj.value());
}
};
template <typename HandleType>
inline AssignableAndPassable<HandleType> MakeAssignableAndPassable(
HandleType* ptr) {
return AssignableAndPassable<HandleType>(ptr);
}
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_PASSABLE_H_
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