pod_interval.h | Explore in Territory

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_POD_INTERVAL_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_POD_INTERVAL_H_

#ifndef NDEBUG
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#endif

#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/gc_plugin.h"

namespace WTF {

// Class representing a closed interval which can hold an arbitrary
// Plain Old Datatype (POD) as its endpoints and a piece of user
// data. An important characteristic for the algorithms we use is that
// if two intervals have identical endpoints but different user data,
// they are not considered to be equal. This situation can arise when
// representing the vertical extents of bounding boxes of overlapping
// triangles, where the pointer to the triangle is the user data of
// the interval.
//
// *Note* that the destructors of type T and UserData will *not* be
// called by this class. They must not allocate any memory that is
// required to be cleaned up in their destructors.
//
// The following constructors and operators must be implemented on
// type T:
//
//   - Copy constructor (if user data is desired)
//   - operator<
//   - operator==
//   - operator=
//
// If the UserData type is specified, it must support a copy
// constructor and assignment operator.
//
// In debug mode, printing of intervals and the data they contain is
// enabled. This requires the following template specializations to be
// available:
//
//   template<> struct ValueToString<T> {
//       static String toString(const T& t);
//   };
//   template<> struct ValueToString<UserData> {
//       static String toString(const UserData& t);
//   };
//
// Note that this class requires a copy constructor and assignment
// operator in order to be stored in the red-black tree.

#ifndef NDEBUG
template <class T>
struct ValueToString;
#endif

template <class T, class UserData = void*>
class PODInterval { … };

#ifndef NDEBUG
template <>
struct ValueToString<float> { … };
template <>
struct ValueToString<double> { … };
template <>
struct ValueToString<int> { … };
#endif

}  // namespace WTF

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_POD_INTERVAL_H_
chromium/third_party/blink/renderer/platform/wtf/pod_interval.h
