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88 lines
2.7 KiB
88 lines
2.7 KiB
// Copyright (C) 2012 The Libphonenumber Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Author: Philippe Liard.
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//
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// Light implementation emulating base/callback.h. This is an internal header,
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// users should not depend on it.
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// Note that this implementation is very limited for now and
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// libphonenumber-specific.
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#ifndef I18N_PHONENUMBERS_CALLBACK_H_
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#define I18N_PHONENUMBERS_CALLBACK_H_
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namespace i18n {
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namespace phonenumbers {
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template <typename R, typename A1, typename A2, typename A3, typename A4>
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class ResultCallback4 {
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public:
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virtual ~ResultCallback4() {}
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virtual R Run(A1 a1, A2 a2, A3 a3, A4 a4) = 0;
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};
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template <typename R, typename A1, typename A2, typename A3, typename A4>
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class FunctionCallback4 : public ResultCallback4<R, A1, A2, A3, A4> {
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public:
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typedef R (FunctionType)(A1, A2, A3, A4);
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explicit FunctionCallback4(FunctionType* function) : function_(function) {}
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virtual ~FunctionCallback4() {}
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virtual R Run(A1 a1, A2 a2, A3 a3, A4 a4) {
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return function_(a1, a2, a3, a4);
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}
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private:
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FunctionType* const function_;
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};
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template <typename T, typename R, typename A1, typename A2, typename A3,
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typename A4>
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class ConstMethodCallback4 : public ResultCallback4<R, A1, A2, A3, A4> {
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public:
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typedef R (T::*MethodType)(A1, A2, A3, A4) const;
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ConstMethodCallback4(const T* instance, MethodType method)
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: instance_(instance),
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method_(method) {}
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virtual ~ConstMethodCallback4() {}
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virtual R Run(A1 a1, A2 a2, A3 a3, A4 a4) {
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return (instance_->*method_)(a1, a2, a3, a4);
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}
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private:
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const T* const instance_;
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MethodType const method_;
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};
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template <typename R, typename A1, typename A2, typename A3, typename A4>
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ResultCallback4<R, A1, A2, A3, A4>* NewPermanentCallback(
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R (*function)(A1, A2, A3, A4)) {
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return new FunctionCallback4<R, A1, A2, A3, A4>(function);
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}
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template <typename T, typename R, typename A1, typename A2, typename A3,
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typename A4>
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ResultCallback4<R, A1, A2, A3, A4>* NewPermanentCallback(
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const T* instance,
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R (T::*method)(A1, A2, A3, A4) const) {
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return new ConstMethodCallback4<T, R, A1, A2, A3, A4>(instance, method);
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}
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} // namespace phonenumbers
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} // namespace i18n
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#endif // I18N_PHONENUMBERS_CALLBACK_H_
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