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core/example/RefCountPtr/cxx_main.cpp
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1/*
2// @HEADER
3// ***********************************************************************
4//
5// Teuchos: Common Tools Package
6// Copyright (2004) Sandia Corporation
7//
8// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
9// license for use of this work by or on behalf of the U.S. Government.
10//
11// Redistribution and use in source and binary forms, with or without
12// modification, are permitted provided that the following conditions are
13// met:
14//
15// 1. Redistributions of source code must retain the above copyright
16// notice, this list of conditions and the following disclaimer.
17//
18// 2. Redistributions in binary form must reproduce the above copyright
19// notice, this list of conditions and the following disclaimer in the
20// documentation and/or other materials provided with the distribution.
21//
22// 3. Neither the name of the Corporation nor the names of the
23// contributors may be used to endorse or promote products derived from
24// this software without specific prior written permission.
25//
26// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
27// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
30// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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34// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37//
38// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
39//
40// ***********************************************************************
41// @HEADER
42*/
43
44#include "Teuchos_RCP.hpp"
45#include "Teuchos_Version.hpp"
46
47class A {
48 public:
49 A() {}
50 virtual ~A(){}
51 virtual void f(){}
52};
53class B1 : virtual public A {};
54class B2 : virtual public A {};
55class C : public B1, public B2 {};
56
57using namespace Teuchos;
58
59int main(int argc, char* argv[])
60{
61
62 std::cout << Teuchos::Teuchos_Version() << std::endl << std::endl;
63
64 // Create some reference-counted pointers.
65 // Create a reference-counted NULL pointer of type A.
66 RCP<A> a_null_ptr;
67 // Create a reference-counted pointer of non-const type A.
68 RCP<A> a_ptr = rcp(new A);
69 // Create a reference-counted pointer of const type A.
70 RCP<const A> ca_ptr = rcp(new A);
71 // Create a const reference-counted pointer of non-const type A.
72 const RCP<A> a_cptr = rcp(new A);
73 // Create a const reference-counted pointer of const type A.
74 const RCP<const A> ca_cptr = rcp(new A);
75
76 // Perform implicit conversions between a derived class and its base class.
77 RCP<B1> b1_ptr = rcp(new B1);
78 RCP<A> a_ptr1 = b1_ptr;
79
80 /* Other non-implicit type conversions like static, dynamic, or const casts
81 can be taken care of by non-member template functions.
82 */
83 RCP<const C> c_ptr = rcp(new C);
84 // Implicit cast from C to B2.
85 RCP<const B2> b2_ptr = c_ptr;
86 // Safe cast, type-checked, from C to A.
87 RCP<const A> ca_ptr1 = rcp_dynamic_cast<const A>(c_ptr);
88 // Unsafe cast, non-type-checked, from C to A.
89 RCP<const A> ca_ptr2 = rcp_static_cast<const A>(c_ptr);
90 // Cast away const from B2.
91 RCP<B2> nc_b2_ptr = rcp_const_cast<B2>(b2_ptr);
92
93 /* Using a reference-counted pointer is very similar to using a raw C++ pointer. Some
94 of the operations that are common to both are:
95 */
96 RCP<A>
97 a_ptr2 = rcp(new A), // Initialize reference-counted pointers.
98 a_ptr3 = rcp(new A); // ""
99 A *ra_ptr2 = new A, // Initialize non-reference counted pointers.
100 *ra_ptr3 = new A; // ""
101 a_ptr2 = rcp(ra_ptr3); // Assign from a raw pointer (only do this once!)
102 a_ptr3 = a_ptr1; // Assign one smart pointer to another.
103 a_ptr2 = rcp(ra_ptr2); // Assign from a raw pointer (only do this once!)
104 a_ptr2->f(); // Access a member of A using ->
105 ra_ptr2->f(); // ""
106 *a_ptr2 = *a_ptr3; // Dereference the objects and assign.
107 *ra_ptr2 = *ra_ptr3; // ""
108
109 // Get the raw C++ pointer.
110 A* true_ptr = 0;
111 true_ptr = a_ptr1.get();
112 TEUCHOS_ASSERT_EQUALITY(true_ptr, b1_ptr.get());
113
114 return 0;
115
116}
Reference-counted pointer class and non-member templated function implementations.
Smart reference counting pointer class for automatic garbage collection.
T * get() const
Get the raw C++ pointer to the underlying object.
int main()
Definition: evilMain.cpp:75
#define TEUCHOS_ASSERT_EQUALITY(val1, val2)
This macro is checks that to numbers are equal and if not then throws an exception with a good error ...
Definition: PackageA.cpp:3
Definition: PackageC.cpp:3
TEUCHOS_DEPRECATED RCP< T > rcp(T *p, Dealloc_T dealloc, bool owns_mem)
Deprecated.
std::string Teuchos_Version()