unittests/ADT/polymorphic_ptr_test.cpp

   1 //===- llvm/unittest/ADT/polymorphic_ptr.h - polymorphic_ptr<T> tests -----===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "gtest/gtest.h"
  11 #include "llvm/ADT/polymorphic_ptr.h"
  12 #include "llvm/Support/raw_ostream.h"
  13
  14 using namespace llvm;
  15
  16 namespace {
  17
  18 struct S {
  19   S(int x) : x(x) {}
  20   S *clone() { return new S(*this); }
  21   int x;
  22 };
  23
  24 // A function that forces the return of a copy.
  25 template <typename T>
  26 T dummy_copy(const T &arg) { return arg; }
  27
  28 TEST(polymorphic_ptr_test, Basic) {
  29   polymorphic_ptr<S> null;
  30   EXPECT_FALSE((bool)null);
  31   EXPECT_TRUE(!null);
  32   EXPECT_EQ((S*)0, null.get());
  33
  34   S *s = new S(42);
  35   polymorphic_ptr<S> p(s);
  36   EXPECT_TRUE((bool)p);
  37   EXPECT_FALSE(!p);
  38   EXPECT_TRUE(p != null);
  39   EXPECT_FALSE(p == null);
  40   EXPECT_TRUE(p == s);
  41   EXPECT_TRUE(s == p);
  42   EXPECT_FALSE(p != s);
  43   EXPECT_FALSE(s != p);
  44   EXPECT_EQ(s, &*p);
  45   EXPECT_EQ(s, p.operator->());
  46   EXPECT_EQ(s, p.get());
  47   EXPECT_EQ(42, p->x);
  48
  49   EXPECT_EQ(s, p.take());
  50   EXPECT_FALSE((bool)p);
  51   EXPECT_TRUE(!p);
  52   p = s;
  53   EXPECT_TRUE((bool)p);
  54   EXPECT_FALSE(!p);
  55   EXPECT_EQ(s, &*p);
  56   EXPECT_EQ(s, p.operator->());
  57   EXPECT_EQ(s, p.get());
  58   EXPECT_EQ(42, p->x);
  59
  60   polymorphic_ptr<S> p2((llvm_move(p)));
  61 #if !LLVM_HAS_RVALUE_REFERENCES
  62   // 'p' may not have been moved from in C++98, fake it for the test.
  63   p2 = p.take();
  64 #endif
  65   EXPECT_FALSE((bool)p);
  66   EXPECT_TRUE(!p);
  67   EXPECT_TRUE((bool)p2);
  68   EXPECT_FALSE(!p2);
  69   EXPECT_EQ(s, &*p2);
  70
  71   using std::swap;
  72   swap(p, p2);
  73   EXPECT_TRUE((bool)p);
  74   EXPECT_FALSE(!p);
  75   EXPECT_EQ(s, &*p);
  76   EXPECT_FALSE((bool)p2);
  77   EXPECT_TRUE(!p2);
  78
  79   // Force copies and that everything survives.
  80   polymorphic_ptr<S> p3 = dummy_copy(polymorphic_ptr<S>(p));
  81   EXPECT_TRUE((bool)p3);
  82   EXPECT_FALSE(!p3);
  83   EXPECT_NE(s, &*p3);
  84   EXPECT_EQ(42, p3->x);
  85
  86   // Force copies of null without trying to dereference anything.
  87   polymorphic_ptr<S> null_copy = dummy_copy(polymorphic_ptr<S>(null));
  88   EXPECT_FALSE((bool)null_copy);
  89   EXPECT_TRUE(!null_copy);
  90   EXPECT_EQ(null, null_copy);
  91 }
  92
  93 struct Base {
  94   virtual ~Base() {}
  95   virtual Base *clone() = 0;
  96   virtual StringRef name() { return "Base"; }
  97 };
  98
  99 struct DerivedA : Base {
 100   virtual DerivedA *clone() { return new DerivedA(); }
 101   virtual StringRef name() { return "DerivedA"; }
 102 };
 103 struct DerivedB : Base {
 104   virtual DerivedB *clone() { return new DerivedB(); }
 105   virtual StringRef name() { return "DerivedB"; }
 106 };
 107
 108 TEST(polymorphic_ptr_test, Polymorphism) {
 109   polymorphic_ptr<Base> a(new DerivedA());
 110   polymorphic_ptr<Base> b(new DerivedB());
 111
 112   EXPECT_EQ("DerivedA", a->name());
 113   EXPECT_EQ("DerivedB", b->name());
 114
 115   polymorphic_ptr<Base> copy = dummy_copy(a);
 116   EXPECT_NE(a, copy);
 117   EXPECT_EQ("DerivedA", copy->name());
 118
 119   copy = dummy_copy(b);
 120   EXPECT_NE(b, copy);
 121   EXPECT_EQ("DerivedB", copy->name());
 122
 123   // Test creating a copy out of a temporary directly.
 124   copy = dummy_copy<polymorphic_ptr<Base> >(new DerivedA());
 125   EXPECT_NE(a, copy);
 126   EXPECT_EQ("DerivedA", copy->name());
 127 }
 128
 129 }