compilerplugins/clang/test/vclwidgets.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <sal/config.h>
  11
  12 #include <vcl/vclptr.hxx>
  13 #include <vcl/vclreferencebase.hxx>
  14
  15 struct Widget : public VclReferenceBase
  16 {
  17     VclPtr<Widget> mpParent;
  18
  19     void widget1()
  20     {
  21         // test that we ignore assignments from a member field
  22         Widget* p = mpParent;
  23         (void)p;
  24         // test against false+
  25         p = (true) ? mpParent.get() : nullptr;
  26     }
  27
  28     ~Widget() override
  29     {
  30         disposeOnce();
  31     }
  32
  33     void dispose() override
  34     {
  35         mpParent.clear();
  36         VclReferenceBase::dispose();
  37     }
  38 };
  39
  40 VclPtr<Widget> f()
  41 {
  42     return nullptr;
  43 }
  44
  45 Widget* g()
  46 {
  47     return nullptr;
  48 }
  49
  50 // test the variable init detection
  51 void bar()
  52 {
  53     Widget* p = f(); // expected-error {{assigning a returned-by-value VclPtr<T> to a T* variable is dodgy, should be assigned to a VclPtr. If you know that the RHS does not return a newly created T, then add a '.get()' to the RHS [loplugin:vclwidgets]}}
  54     (void)p;
  55     Widget* q = g();
  56     (void)q;
  57     Widget* r = nullptr;
  58     (void)r;
  59 }
  60
  61 // test the assignment detection
  62 void bar2()
  63 {
  64     Widget* p;
  65     p = nullptr;
  66     p = f(); // expected-error {{assigning a returned-by-value VclPtr<T> to a T* variable is dodgy, should be assigned to a VclPtr. If you know that the RHS does not return a newly created T, then add a '.get()' to the RHS [loplugin:vclwidgets]}}
  67     (void)p;
  68     Widget* q;
  69     q = g();
  70     (void)q;
  71 }
  72
  73
  74 // test against false+
  75
  76 template<class T>
  77 T * get() { return nullptr; }
  78
  79 void bar3()
  80 {
  81     Widget* p;
  82     p = get<Widget>();
  83 }
  84
  85
  86
  87
  88 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */