// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MINI_CHROMIUM_BASE_SCOPED_GENERIC_H_
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#define MINI_CHROMIUM_BASE_SCOPED_GENERIC_H_
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#include <stdlib.h>
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#include <algorithm>
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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namespace base {
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template<typename T, typename Traits>
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class ScopedGeneric {
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private:
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struct Data : public Traits {
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explicit Data(const T& in) : generic(in) {}
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Data(const T& in, const Traits& other) : Traits(other), generic(in) {}
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T generic;
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};
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public:
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typedef T element_type;
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typedef Traits traits_type;
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ScopedGeneric() : data_(traits_type::InvalidValue()) {}
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explicit ScopedGeneric(const element_type& value) : data_(value) {}
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ScopedGeneric(const element_type& value, const traits_type& traits)
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: data_(value, traits) {
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}
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ScopedGeneric(ScopedGeneric<T, Traits>&& rvalue)
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: data_(rvalue.release(), rvalue.get_traits()) {
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}
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~ScopedGeneric() {
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FreeIfNecessary();
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}
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ScopedGeneric& operator=(ScopedGeneric<T, Traits>&& rvalue) {
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reset(rvalue.release());
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return *this;
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}
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void reset(const element_type& value = traits_type::InvalidValue()) {
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if (data_.generic != traits_type::InvalidValue() && data_.generic == value)
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abort();
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FreeIfNecessary();
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data_.generic = value;
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}
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void swap(ScopedGeneric& other) {
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using std::swap;
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swap(static_cast<Traits&>(data_), static_cast<Traits&>(other.data_));
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swap(data_.generic, other.data_.generic);
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}
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element_type release() WARN_UNUSED_RESULT {
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element_type old_generic = data_.generic;
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data_.generic = traits_type::InvalidValue();
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return old_generic;
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}
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const element_type& get() const { return data_.generic; }
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bool is_valid() const { return data_.generic != traits_type::InvalidValue(); }
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bool operator==(const element_type& value) const {
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return data_.generic == value;
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}
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bool operator!=(const element_type& value) const {
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return data_.generic != value;
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}
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Traits& get_traits() { return data_; }
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const Traits& get_traits() const { return data_; }
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private:
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void FreeIfNecessary() {
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if (data_.generic != traits_type::InvalidValue()) {
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data_.Free(data_.generic);
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data_.generic = traits_type::InvalidValue();
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}
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}
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template <typename T2, typename Traits2> bool operator==(
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const ScopedGeneric<T2, Traits2>& p2) const;
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template <typename T2, typename Traits2> bool operator!=(
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const ScopedGeneric<T2, Traits2>& p2) const;
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Data data_;
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DISALLOW_COPY_AND_ASSIGN(ScopedGeneric);
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};
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template<class T, class Traits>
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void swap(const ScopedGeneric<T, Traits>& a,
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const ScopedGeneric<T, Traits>& b) {
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a.swap(b);
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}
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template<class T, class Traits>
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bool operator==(const T& value, const ScopedGeneric<T, Traits>& scoped) {
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return value == scoped.get();
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}
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template<class T, class Traits>
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bool operator!=(const T& value, const ScopedGeneric<T, Traits>& scoped) {
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return value != scoped.get();
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}
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} // namespace base
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#endif // MINI_CHROMIUM_BASE_SCOPED_GENERIC_H_
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