compilerplugins/clang/test/optvalue.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 "config_clang.h"
  11
  12 template <typename Type> class OptValue
  13 {
  14 public:
  15     OptValue()
  16         : maValue()
  17         , mbHasValue(false)
  18     {
  19     }
  20     explicit OptValue(const Type& rValue)
  21         : maValue(rValue)
  22         , mbHasValue(true)
  23     {
  24     }
  25
  26     bool has_value() const { return mbHasValue; }
  27     bool operator!() const { return !mbHasValue; }
  28
  29     const Type& value() const { return maValue; }
  30     const Type& value_or(const Type& rDefValue) const { return mbHasValue ? maValue : rDefValue; }
  31
  32     Type& operator*() { return maValue; }
  33     Type& emplace()
  34     {
  35         mbHasValue = true;
  36         maValue = Type();
  37         return maValue;
  38     }
  39
  40     OptValue& operator=(const Type& rValue)
  41     {
  42         maValue = rValue;
  43         mbHasValue = true;
  44         return *this;
  45     }
  46     bool operator==(const OptValue& rValue) const
  47     {
  48         return ((!mbHasValue && rValue.mbHasValue == false)
  49                 || (mbHasValue == rValue.mbHasValue && maValue == rValue.maValue));
  50     }
  51
  52 private:
  53     Type maValue;
  54     bool mbHasValue;
  55 };
  56
  57 struct AttributeList
  58 {
  59     OptValue<int> getInteger();
  60 };
  61
  62 namespace test1
  63 {
  64 void foo(AttributeList& rAttrs)
  65 {
  66     // expected-error@+1 {{call to OptValue::value() [loplugin:optvalue]}}
  67     rAttrs.getInteger().value();
  68
  69     // no warning expected
  70     OptValue<int> x;
  71     x.value();
  72 }
  73 }
  74
  75 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */