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    41 

    42 #ifndef DEBUGGER_CALLBACK_H

    43 #define DEBUGGER_CALLBACK_H

    44 

    45 #include "symbianutils_global.h"

    46 

    47 namespace trk {

    48 namespace Internal {

    49 

    50 /* Helper class for the 1-argument functor:

    51  * Cloneable base class for the implementation which is

    52  * invokeable with the argument. */

    53 template <class Argument>

    54 class CallbackImplBase

    55 {

    56     Q_DISABLE_COPY(CallbackImplBase)

    57 public:

    58     CallbackImplBase() {}

    59     virtual CallbackImplBase *clone() const = 0;

    60     virtual void invoke(Argument a) = 0;

    61     virtual ~CallbackImplBase() {}

    62 };

    63 

    64 /* Helper class for the 1-argument functor: Implementation for

    65  * a class instance with a member function pointer. */

    66 template <class Class, class Argument>

    67 class CallbackMemberPtrImpl : public CallbackImplBase<Argument>

    68 {

    69 public:

    70     typedef void (Class::*MemberFuncPtr)(Argument);

    71 

    72     CallbackMemberPtrImpl(Class *instance,

    73                           MemberFuncPtr memberFunc) :

    74                           m_instance(instance),

    75                           m_memberFunc(memberFunc) {}

    76 

    77     virtual CallbackImplBase<Argument> *clone() const

    78     {

    79         return new CallbackMemberPtrImpl<Class, Argument>(m_instance, m_memberFunc);

    80     }

    81 

    82     virtual void invoke(Argument a)

    83         { (m_instance->*m_memberFunc)(a); }

    84 private:

    85     Class *m_instance;

    86     MemberFuncPtr m_memberFunc;

    87 };

    88 

    89 } // namespace Internal

    90 

    91 /* Default-constructible, copyable 1-argument functor providing an

    92  * operator()(Argument) that invokes a member function of a class:

    93  * \code

    94 class Foo {

    95 public:

    96     void print(const std::string &);

    97 };

    98 ...

    99 Foo foo;

   100 Callback<const std::string &> f1(&foo, &Foo::print);

   101 f1("test");

   102 \endcode */

   103 

   104 template <class Argument>

   105 class Callback

   106 {

   107 public:

   108     Callback() : m_impl(0) {}

   109 

   110     template <class Class>

   111     Callback(Class *instance, void (Class::*memberFunc)(Argument)) :

   112         m_impl(new Internal::CallbackMemberPtrImpl<Class,Argument>(instance, memberFunc))

   113     {}

   114 

   115     ~Callback()

   116     {

   117         clean();

   118     }

   119 

   120     Callback(const Callback &rhs) :

   121         m_impl(0)

   122     {

   123         if (rhs.m_impl)

   124             m_impl = rhs.m_impl->clone();

   125     }

   126 

   127     Callback &operator=(const Callback &rhs)

   128     {

   129         if (this != &rhs) {

   130             clean();

   131             if (rhs.m_impl)

   132                 m_impl = rhs.m_impl->clone();

   133         }

   134         return *this;

   135     }

   136 

   137     bool isNull() const { return m_impl == 0; }

   138     operator bool() const { return !isNull(); }

   139 

   140     void operator()(Argument a)

   141     {

   142         if (m_impl)

   143             m_impl->invoke(a);

   144     }

   145 

   146 private:

   147     void clean()

   148     {

   149         if (m_impl) {

   150             delete m_impl;

   151             m_impl = 0;

   152         }

   153     }

   154 

   155     Internal::CallbackImplBase<Argument> *m_impl;

   156 };

   157 

   158 } // namespace trk

   159 

   160 #endif // DEBUGGER_CALLBACK_H