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https://github.com/c64scene-ar/llvm-6502.git
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[C++11] Now that we have C++11 and I've replaced the use of this
horrible smart pointer by std::unique_ptr and strict move semantics, rip this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203392 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
parent
15903b7dc5
commit
f328eebf32
@ -1,115 +0,0 @@
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//===- 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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polymorphic_ptr(polymorphic_ptr &&arg) : ptr(arg.take()) {}
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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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@ -40,7 +40,6 @@ set(ADTSources
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TripleTest.cpp
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TripleTest.cpp
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TwineTest.cpp
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TwineTest.cpp
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VariadicFunctionTest.cpp
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VariadicFunctionTest.cpp
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polymorphic_ptr_test.cpp
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)
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)
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add_llvm_unittest(ADTTests
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add_llvm_unittest(ADTTests
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//===- llvm/unittest/ADT/polymorphic_ptr.h - polymorphic_ptr<T> tests -----===//
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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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#include "gtest/gtest.h"
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#include "llvm/ADT/polymorphic_ptr.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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struct S {
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S(int x) : x(x) {}
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S *clone() { return new S(*this); }
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int x;
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};
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// A function that forces the return of a copy.
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template <typename T>
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T dummy_copy(const T &arg) { return arg; }
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TEST(polymorphic_ptr_test, Basic) {
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polymorphic_ptr<S> null;
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EXPECT_FALSE((bool)null);
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EXPECT_TRUE(!null);
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EXPECT_EQ((S*)0, null.get());
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S *s = new S(42);
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polymorphic_ptr<S> p(s);
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EXPECT_TRUE((bool)p);
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EXPECT_FALSE(!p);
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EXPECT_TRUE(p != null);
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EXPECT_FALSE(p == null);
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EXPECT_TRUE(p == s);
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EXPECT_TRUE(s == p);
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EXPECT_FALSE(p != s);
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EXPECT_FALSE(s != p);
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EXPECT_EQ(s, &*p);
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EXPECT_EQ(s, p.operator->());
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EXPECT_EQ(s, p.get());
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EXPECT_EQ(42, p->x);
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EXPECT_EQ(s, p.take());
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EXPECT_FALSE((bool)p);
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EXPECT_TRUE(!p);
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p = s;
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EXPECT_TRUE((bool)p);
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EXPECT_FALSE(!p);
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EXPECT_EQ(s, &*p);
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EXPECT_EQ(s, p.operator->());
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EXPECT_EQ(s, p.get());
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EXPECT_EQ(42, p->x);
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polymorphic_ptr<S> p2((std::move(p)));
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EXPECT_FALSE((bool)p);
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EXPECT_TRUE(!p);
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EXPECT_TRUE((bool)p2);
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EXPECT_FALSE(!p2);
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EXPECT_EQ(s, &*p2);
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using std::swap;
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swap(p, p2);
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EXPECT_TRUE((bool)p);
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EXPECT_FALSE(!p);
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EXPECT_EQ(s, &*p);
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EXPECT_FALSE((bool)p2);
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EXPECT_TRUE(!p2);
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// Force copies and that everything survives.
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polymorphic_ptr<S> p3 = dummy_copy(polymorphic_ptr<S>(p));
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EXPECT_TRUE((bool)p3);
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EXPECT_FALSE(!p3);
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EXPECT_NE(s, &*p3);
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EXPECT_EQ(42, p3->x);
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// Force copies of null without trying to dereference anything.
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polymorphic_ptr<S> null_copy = dummy_copy(polymorphic_ptr<S>(null));
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EXPECT_FALSE((bool)null_copy);
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EXPECT_TRUE(!null_copy);
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EXPECT_EQ(null, null_copy);
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}
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struct Base {
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virtual ~Base() {}
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virtual Base *clone() = 0;
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virtual StringRef name() { return "Base"; }
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};
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struct DerivedA : Base {
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virtual DerivedA *clone() { return new DerivedA(); }
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virtual StringRef name() { return "DerivedA"; }
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};
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struct DerivedB : Base {
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virtual DerivedB *clone() { return new DerivedB(); }
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virtual StringRef name() { return "DerivedB"; }
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};
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TEST(polymorphic_ptr_test, Polymorphism) {
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polymorphic_ptr<Base> a(new DerivedA());
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polymorphic_ptr<Base> b(new DerivedB());
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EXPECT_EQ("DerivedA", a->name());
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EXPECT_EQ("DerivedB", b->name());
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polymorphic_ptr<Base> copy = dummy_copy(a);
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EXPECT_NE(a, copy);
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EXPECT_EQ("DerivedA", copy->name());
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copy = dummy_copy(b);
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EXPECT_NE(b, copy);
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EXPECT_EQ("DerivedB", copy->name());
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// Test creating a copy out of a temporary directly.
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copy = dummy_copy<polymorphic_ptr<Base> >(new DerivedA());
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EXPECT_NE(a, copy);
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EXPECT_EQ("DerivedA", copy->name());
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}
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}
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