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-rw-r--r--include/llvm/ADT/polymorphic_ptr.h117
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diff --git a/include/llvm/ADT/polymorphic_ptr.h b/include/llvm/ADT/polymorphic_ptr.h
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-//===- llvm/ADT/polymorphic_ptr.h - Smart copyable owned ptr ----*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-/// \file
-/// This file provides a polymorphic_ptr class template. See the class comments
-/// for details about this API, its intended use cases, etc.
-///
-/// The primary motivation here is to work around the necessity of copy
-/// semantics in C++98. This is typically used where any actual copies are
-/// incidental or unnecessary. As a consequence, it is expected to cease to be
-/// useful and be removed when we can directly rely on move-only types.
-///
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_ADT_POLYMORPHIC_PTR_H
-#define LLVM_ADT_POLYMORPHIC_PTR_H
-
-#include "llvm/Support/Compiler.h"
-
-namespace llvm {
-
-/// \brief An owning, copyable polymorphic smart pointer.
-///
-/// This pointer exists to provide copyable owned smart pointer. Rather than
-/// shared ownership semantics, it has unique ownership semantics and deep copy
-/// semantics. It is copyable by requiring that the underlying type exposes
-/// a method which can produce a (heap allocated) clone.
-///
-/// Note that in almost all scenarios use of this could be avoided if we could
-/// build move-only containers of a std::unique_ptr, but until then this
-/// provides an effective way to place polymorphic objects in a container.
-template <typename T> class polymorphic_ptr {
- T *ptr;
-
-public:
- polymorphic_ptr(T *ptr = 0) : ptr(ptr) {}
- polymorphic_ptr(const polymorphic_ptr &arg) : ptr(arg ? arg->clone() : 0) {}
-#if LLVM_HAS_RVALUE_REFERENCES
- polymorphic_ptr(polymorphic_ptr &&arg) : ptr(arg.take()) {}
-#endif
- ~polymorphic_ptr() { delete ptr; }
-
- polymorphic_ptr &operator=(polymorphic_ptr arg) {
- swap(arg);
- return *this;
- }
- polymorphic_ptr &operator=(T *arg) {
- if (arg != ptr) {
- delete ptr;
- ptr = arg;
- }
- return *this;
- }
-
- T &operator*() const { return *ptr; }
- T *operator->() const { return ptr; }
- LLVM_EXPLICIT operator bool() const { return ptr != 0; }
- bool operator!() const { return ptr == 0; }
-
- T *get() const { return ptr; }
-
- T *take() {
- T *tmp = ptr;
- ptr = 0;
- return tmp;
- }
-
- void swap(polymorphic_ptr &arg) {
- T *tmp = ptr;
- ptr = arg.ptr;
- arg.ptr = tmp;
- }
-};
-
-template <typename T>
-void swap(polymorphic_ptr<T> &lhs, polymorphic_ptr<T> &rhs) {
- lhs.swap(rhs);
-}
-
-template <typename T, typename U>
-bool operator==(const polymorphic_ptr<T> &lhs, const polymorphic_ptr<U> &rhs) {
- return lhs.get() == rhs.get();
-}
-
-template <typename T, typename U>
-bool operator!=(const polymorphic_ptr<T> &lhs, const polymorphic_ptr<U> &rhs) {
- return lhs.get() != rhs.get();
-}
-
-template <typename T, typename U>
-bool operator==(const polymorphic_ptr<T> &lhs, U *rhs) {
- return lhs.get() == rhs;
-}
-
-template <typename T, typename U>
-bool operator!=(const polymorphic_ptr<T> &lhs, U *rhs) {
- return lhs.get() != rhs;
-}
-
-template <typename T, typename U>
-bool operator==(T *lhs, const polymorphic_ptr<U> &rhs) {
- return lhs == rhs.get();
-}
-
-template <typename T, typename U>
-bool operator!=(T *lhs, const polymorphic_ptr<U> &rhs) {
- return lhs != rhs.get();
-}
-
-}
-
-#endif