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Diffstat (limited to 'include/llvm/ADT/polymorphic_ptr.h')
-rw-r--r-- | include/llvm/ADT/polymorphic_ptr.h | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/include/llvm/ADT/polymorphic_ptr.h b/include/llvm/ADT/polymorphic_ptr.h deleted file mode 100644 index b8d8d71238e3..000000000000 --- a/include/llvm/ADT/polymorphic_ptr.h +++ /dev/null @@ -1,117 +0,0 @@ -//===- 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 |