src/FbTk/MemFun.hh (raw)
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// MemFun.hh for FbTk, Fluxbox Toolkit // Copyright (c) 2008 Henrik Kinnunen (fluxgen at fluxbox dot org) // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. #ifndef FBTK_MEM_FUN_HH #define FBTK_MEM_FUN_HH #include <functional> #include "SelectArg.hh" namespace FbTk { /// No argument functor template <typename ReturnType, typename Object> class MemFun0 { public: typedef ReturnType (Object:: *Action)(); MemFun0(Object& obj, Action action): m_obj(obj), m_action(action) { } ReturnType operator ()() const { return (m_obj.*m_action)(); } private: Object& m_obj; Action m_action; }; template <typename ReturnType, typename Object> MemFun0<ReturnType, Object> MemFun( Object& obj, ReturnType (Object:: *action)() ) { return MemFun0<ReturnType, Object>(obj, action); } /// One argument functor template <typename ReturnType, typename Object, typename Arg1> class MemFun1: public std::unary_function<Arg1, ReturnType> { public: typedef ReturnType (Object:: *Action)(Arg1); MemFun1(Object& obj, Action action): m_obj(obj), m_action(action) { } ReturnType operator ()(Arg1 arg1) const { return (m_obj.*m_action)(arg1); } private: Object& m_obj; Action m_action; }; /// One argument functor helper function template <typename ReturnType, typename Object, typename Arg1> MemFun1<ReturnType, Object, Arg1> MemFun( Object& obj, ReturnType (Object:: *action)(Arg1) ) { return MemFun1<ReturnType, Object, Arg1>(obj, action); } /// Two argument functor template <typename ReturnType, typename Object, typename Arg1, typename Arg2> class MemFun2: public std::binary_function<Arg1, Arg2, ReturnType> { public: typedef ReturnType (Object:: *Action)(Arg1,Arg2); MemFun2(Object& obj, Action action): m_obj(obj), m_action(action) { } ReturnType operator ()(Arg1 arg1, Arg2 arg2) const { return (m_obj.*m_action)(arg1, arg2); } private: Object& m_obj; Action m_action; }; /// Two argument functor helper function template <typename ReturnType, typename Object, typename Arg1, typename Arg2> MemFun2<ReturnType, Object, Arg1, Arg2> MemFun( Object& obj, ReturnType (Object:: *action)(Arg1,Arg2) ) { return MemFun2<ReturnType, Object, Arg1, Arg2>(obj, action); } /// Three argument functor template <typename ReturnType, typename Object, typename Arg1, typename Arg2, typename Arg3> class MemFun3 { public: typedef ReturnType (Object:: *Action)(Arg1,Arg2,Arg3); MemFun3(Object& obj, Action action): m_obj(obj), m_action(action) { } ReturnType operator ()(Arg1 arg1, Arg2 arg2, Arg3 arg3) const { return (m_obj.*m_action)(arg1, arg2, arg3); } private: Object& m_obj; Action m_action; }; /// Three argument functor helper template <typename ReturnType, typename Object, typename Arg1, typename Arg2, typename Arg3> MemFun3<ReturnType, Object, Arg1, Arg2, Arg3> MemFun( Object& obj, ReturnType (Object:: *action)(Arg1, Arg2, Arg3) ) { return MemFun3<ReturnType, Object, Arg1, Arg2, Arg3>(obj, action); } /// Ignores all arguments template <typename ReturnType, typename Object> class MemFun0IgnoreArgs: public MemFun0<ReturnType, Object> { public: typedef MemFun0<ReturnType, Object> BaseType; MemFun0IgnoreArgs(Object& obj, typename BaseType::Action action): BaseType(obj, action) { } template <typename IgnoreType1, typename IgnoreType2, typename IgnoreType3> ReturnType operator ()(IgnoreType1&, IgnoreType2&, IgnoreType3&) const { return BaseType::operator ()(); } template <typename IgnoreType1, typename IgnoreType2> ReturnType operator ()(IgnoreType1&, IgnoreType2&) const { return BaseType::operator ()(); } template <typename IgnoreType1> ReturnType operator ()(IgnoreType1&) const { return BaseType::operator ()(); } }; /// Ignores second and third argument template <typename ReturnType, typename Object, typename Arg1> class MemFun1IgnoreArgs: public MemFun1<ReturnType, Object, Arg1> { public: typedef MemFun1<ReturnType, Object, Arg1> BaseType; MemFun1IgnoreArgs(Object& obj, typename BaseType::Action& action): BaseType(obj, action) { } template <typename IgnoreType1, typename IgnoreType2> ReturnType operator ()(Arg1 arg1, IgnoreType1&, IgnoreType2&) const { return BaseType::operator ()(arg1); } template <typename IgnoreType> ReturnType operator ()(Arg1 arg1, IgnoreType&) const { return BaseType::operator ()(arg1); } }; /// Takes two arguments but ignores the third template <typename ReturnType, typename Object, typename Arg1, typename Arg2> class MemFun2IgnoreArgs: public MemFun2<ReturnType, Object, Arg1, Arg2> { public: typedef MemFun2<ReturnType, Object, Arg1, Arg2> BaseType; MemFun2IgnoreArgs(Object& obj, typename BaseType::Action& action): BaseType(obj, action) { } template < typename IgnoreType > ReturnType operator ()(Arg1 arg1, Arg2 arg2, IgnoreType&) const { return BaseType::operator ()(arg1, arg2); } }; /// Creates functor that ignores all arguments. template <typename ReturnType, typename Object> MemFun0IgnoreArgs<ReturnType, Object> MemFunIgnoreArgs( Object& obj, ReturnType (Object:: *action)() ) { return MemFun0IgnoreArgs<ReturnType, Object>(obj, action); } /// Creates functor that ignores second and third argument. template <typename ReturnType, typename Object, typename Arg1> MemFun1IgnoreArgs<ReturnType, Object, Arg1> MemFunIgnoreArgs( Object& obj, ReturnType (Object:: *action)(Arg1) ) { return MemFun1IgnoreArgs<ReturnType, Object, Arg1>(obj, action); } /// Creates functor that ignores third argument. template <typename ReturnType, typename Object, typename Arg1, typename Arg2> MemFun2IgnoreArgs<ReturnType, Object, Arg1, Arg2> MemFunIgnoreArgs( Object& obj, ReturnType (Object:: *action)(Arg1,Arg2) ) { return MemFun2IgnoreArgs<ReturnType, Object, Arg1, Arg2>(obj, action); } /** * Creates a functor that selects a specific argument of three possible ones * and uses it for the single argument operator. */ template < int ArgNum, typename Functor, typename ReturnType> class MemFunSelectArgImpl { public: MemFunSelectArgImpl(Functor func): m_func(func) { } template <typename Type1, typename Type2, typename Type3> ReturnType operator ()(Type1& a, Type2& b, Type3& c) const { return m_func(STLUtil::SelectArg<ArgNum>()(a, b, c)); } template <typename Type1, typename Type2> ReturnType operator ()(Type1& a, Type2& b) const { return m_func(STLUtil::SelectArg<ArgNum>()(a, b)); } template <typename Type1> ReturnType operator ()(Type1& a) const { return m_func(a); } private: Functor m_func; }; /// Creates a functor that selects the first argument of three possible ones /// and uses it for the single argument operator. template <typename ReturnType, typename Object, typename Arg1> MemFunSelectArgImpl<0, MemFun1<ReturnType, Object, Arg1>, ReturnType> MemFunSelectArg0(Object& obj, ReturnType (Object:: *action)(Arg1)) { return MemFunSelectArgImpl<0, MemFun1<ReturnType, Object, Arg1>, ReturnType>(MemFun(obj, action)); } /// Creates a functor that selects the second argument (or first if there is /// only one) of three possible onesand uses it for the single argument operator. template <typename ReturnType, typename Object, typename Arg1> MemFunSelectArgImpl<1, MemFun1<ReturnType, Object, Arg1>, ReturnType> MemFunSelectArg1(Object& obj, ReturnType (Object:: *action)(Arg1)) { return MemFunSelectArgImpl<1, MemFun1<ReturnType, Object, Arg1>, ReturnType>(MemFun(obj, action)); } /// Creates a functor that selects the third argument (or the last argument if there is /// less than three arguments) of three possible onesand uses it for the single argument operator. template <typename ReturnType, typename Object, typename Arg1> MemFunSelectArgImpl<2, MemFun1<ReturnType, Object, Arg1>, ReturnType> MemFunSelectArg2(Object& obj, ReturnType (Object:: *action)(Arg1)) { return MemFunSelectArgImpl<2, MemFun1<ReturnType, Object, Arg1>, ReturnType>(MemFun(obj, action)); } /// Creates a functor with a bound parameter template<typename ReturnType, typename Object, typename Arg1> class MemFunBind1 { public: typedef ReturnType (Object:: *Action)(Arg1); MemFunBind1(Object& obj, Action action, Arg1 arg1): m_obj(obj), m_action(action), m_arg1(arg1) { } ReturnType operator()() const { return (m_obj.*m_action)(m_arg1); } private: Object& m_obj; Action m_action; Arg1 m_arg1; }; /// Creates a functor with a bound parameter template<typename ReturnType, typename Object, typename Arg1> MemFunBind1<ReturnType, Object, Arg1> MemFunBind( Object& obj, ReturnType (Object:: *action)(Arg1), Arg1 arg1 ) { return MemFunBind1<ReturnType, Object, Arg1>(obj, action, arg1); } /// Creates a functor with a bound parameter template<typename ReturnType, typename Object, typename Arg1, typename Arg2> class MemFunBind2 { public: typedef ReturnType (Object:: *Action)(Arg1, Arg2); MemFunBind2(Object& obj, Action action, Arg1 arg1, Arg2 arg2): m_obj(obj), m_action(action), m_arg1(arg1), m_arg2(arg2) { } ReturnType operator()() const { return (m_obj.*m_action)(m_arg1, m_arg2); } private: Object& m_obj; Action m_action; Arg1 m_arg1; Arg2 m_arg2; }; /// Creates a functor with a bound parameter template<typename ReturnType, typename Object, typename Arg1, typename Arg2> MemFunBind2<ReturnType, Object, Arg1, Arg2> MemFunBind( Object& obj, ReturnType (Object:: *action)(Arg1, Arg2), Arg1 arg1, Arg2 arg2 ) { return MemFunBind2<ReturnType, Object, Arg1, Arg2>(obj, action, arg1, arg2); } /// Creates a functor with a bound parameter template<typename ReturnType, typename Object, typename Arg1, typename Arg2, typename Arg3> class MemFunBind3 { public: typedef ReturnType (Object:: *Action)(Arg1, Arg2, Arg3); MemFunBind3(Object& obj, Action action, Arg1 arg1, Arg2 arg2, Arg3 arg3): m_obj(obj), m_action(action), m_arg1(arg1), m_arg2(arg2), m_arg3(arg3) { } ReturnType operator()() const { return (m_obj.*m_action)(m_arg1, m_arg2, m_arg3); } private: Object& m_obj; Action m_action; Arg1 m_arg1; Arg2 m_arg2; Arg3 m_arg3; }; /// Creates a functor with a bound parameter template<typename ReturnType, typename Object, typename Arg1, typename Arg2, typename Arg3> MemFunBind2<ReturnType, Object, Arg1, Arg2> MemFunBind( Object& obj, ReturnType (Object:: *action)(Arg1, Arg2, Arg3), Arg1 arg1, Arg2 arg2, Arg3 arg3 ) { return MemFunBind3<ReturnType, Object, Arg1, Arg2, Arg3>(obj, action, arg1, arg2, arg3); } } // namespace FbTk #endif // FBTK_MEM_FUN_HH |