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https://github.com/c64scene-ar/llvm-6502.git
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3c3f6be0c8
This bug only bit the C++98 build bots because all of the actual uses really do move. ;] But not *quite* ready to do the whole C++11 switch yet, so clean it up. Also add a unit test that catches this immediately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194548 91177308-0d34-0410-b5e6-96231b3b80d8
118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
//===- llvm/ADT/polymorphic_ptr.h - Smart copyable owned ptr ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This file provides a polymorphic_ptr class template. See the class comments
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/// for details about this API, its intended use cases, etc.
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///
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/// The primary motivation here is to work around the necessity of copy
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/// semantics in C++98. This is typically used where any actual copies are
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/// incidental or unnecessary. As a consequence, it is expected to cease to be
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/// useful and be removed when we can directly rely on move-only types.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_POLYMORPHIC_PTR_H
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#define LLVM_ADT_POLYMORPHIC_PTR_H
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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/// \brief An owning, copyable polymorphic smart pointer.
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///
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/// This pointer exists to provide copyable owned smart pointer. Rather than
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/// shared ownership semantics, it has unique ownership semantics and deep copy
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/// semantics. It is copyable by requiring that the underlying type exposes
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/// a method which can produce a (heap allocated) clone.
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///
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/// Note that in almost all scenarios use of this could be avoided if we could
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/// build move-only containers of a std::unique_ptr, but until then this
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/// provides an effective way to place polymorphic objects in a container.
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template <typename T> class polymorphic_ptr {
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T *ptr;
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public:
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polymorphic_ptr(T *ptr = 0) : ptr(ptr) {}
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polymorphic_ptr(const polymorphic_ptr &arg) : ptr(arg ? arg->clone() : 0) {}
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#if LLVM_HAS_RVALUE_REFERENCES
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polymorphic_ptr(polymorphic_ptr &&arg) : ptr(arg.take()) {}
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#endif
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~polymorphic_ptr() { delete ptr; }
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polymorphic_ptr &operator=(polymorphic_ptr arg) {
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swap(arg);
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return *this;
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}
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polymorphic_ptr &operator=(T *arg) {
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if (arg != ptr) {
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delete ptr;
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ptr = arg;
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}
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return *this;
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}
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T &operator*() const { return *ptr; }
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T *operator->() const { return ptr; }
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LLVM_EXPLICIT operator bool() const { return ptr != 0; }
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bool operator!() const { return ptr == 0; }
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T *get() const { return ptr; }
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T *take() {
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T *tmp = ptr;
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ptr = 0;
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return tmp;
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}
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void swap(polymorphic_ptr &arg) {
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T *tmp = ptr;
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ptr = arg.ptr;
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arg.ptr = tmp;
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}
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};
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template <typename T>
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void swap(polymorphic_ptr<T> &lhs, polymorphic_ptr<T> &rhs) {
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lhs.swap(rhs);
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}
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template <typename T, typename U>
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bool operator==(const polymorphic_ptr<T> &lhs, const polymorphic_ptr<U> &rhs) {
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return lhs.get() == rhs.get();
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}
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template <typename T, typename U>
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bool operator!=(const polymorphic_ptr<T> &lhs, const polymorphic_ptr<U> &rhs) {
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return lhs.get() != rhs.get();
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}
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template <typename T, typename U>
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bool operator==(const polymorphic_ptr<T> &lhs, U *rhs) {
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return lhs.get() == rhs;
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}
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template <typename T, typename U>
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bool operator!=(const polymorphic_ptr<T> &lhs, U *rhs) {
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return lhs.get() != rhs;
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}
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template <typename T, typename U>
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bool operator==(T *lhs, const polymorphic_ptr<U> &rhs) {
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return lhs == rhs.get();
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}
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template <typename T, typename U>
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bool operator!=(T *lhs, const polymorphic_ptr<U> &rhs) {
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return lhs != rhs.get();
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}
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}
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#endif
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