1 // 2 // Copyright (c) 2010-2017 Benjamin Kaufmann 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a copy 5 // of this software and associated documentation files (the "Software"), to 6 // deal in the Software without restriction, including without limitation the 7 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 8 // sell copies of the Software, and to permit persons to whom the Software is 9 // furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 20 // IN THE SOFTWARE. 21 // 22 // 23 // NOTE: ProgramOptions is inspired by Boost.Program_options 24 // see: www.boost.org/libs/program_options 25 // 26 #ifndef PROGRAM_OPTIONS_NOTIFIER_H_INCLUDED 27 #define PROGRAM_OPTIONS_NOTIFIER_H_INCLUDED 28 29 namespace Potassco { namespace ProgramOptions { namespace detail { 30 31 /////////////////////////////////////////////////////////////////////////////// 32 // Notifier 33 /////////////////////////////////////////////////////////////////////////////// 34 // HACK: 35 // This should actually be replaced with a proper and typesafe delegate class. 36 // At least, it should be parametrized on the actual parameter type since 37 // the invocation of f via the generic func is not strictly conforming. 38 // Yet, it should work on all major compilers - we do not mess with 39 // the address and the alignment of void* should be compatible with that of T*. 40 template <class ParamT> 41 struct Notifier { 42 typedef bool (*notify_func_type)(void*, const std::string& name, ParamT); NotifierNotifier43 Notifier() : obj(0), func(0) {} 44 template <class O> NotifierNotifier45 Notifier(O* o, bool (*f)(O*, const std::string&, ParamT)) { 46 obj = o; 47 func= reinterpret_cast<notify_func_type>(f); 48 } 49 void* obj; 50 notify_func_type func; notifyNotifier51 bool notify(const std::string& name, ParamT val) const { 52 return func(obj, name, val); 53 } emptyNotifier54 bool empty() const { return func == 0; } 55 }; 56 57 template <class ParamT, class ObjT> 58 struct Notify { 59 typedef bool (*type)(ObjT*, const std::string& name, ParamT); 60 }; 61 62 } // namespace detail 63 } // namespace ProgramOptions 64 } // namespace Potassco 65 #endif 66