2016-11-27 12:55:32 +00:00
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template <typename Fun>
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class Function;
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template <typename Ret, typename... Args>
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2016-11-27 13:09:31 +00:00
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class Function<Ret(Args...)>
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2016-11-27 12:55:32 +00:00
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{
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2016-11-27 13:00:34 +00:00
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private:
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class callable_base
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{
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public:
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virtual Ret call(Args...) = 0;
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2016-11-27 13:12:06 +00:00
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virtual ~callable_base() {}
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//virtual ~callable_base() = default; // melyik számít szebbnek? van bármi különbség?
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2016-11-27 13:00:34 +00:00
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};
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2016-11-27 13:02:28 +00:00
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template <typename Fun>
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class callable : public callable_base
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{
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private:
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2016-11-27 13:06:57 +00:00
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Fun _fun;
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2016-11-27 13:02:28 +00:00
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public:
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2016-11-27 13:06:57 +00:00
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callable(Fun fun):_fun(fun) {}
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2016-11-27 13:12:06 +00:00
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virtual Ret call(Args... args) override
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2016-11-27 13:06:57 +00:00
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{ return _fun(std::forward<Args>(args)...); }
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2016-11-27 13:12:06 +00:00
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virtual ~callable() override {}
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2016-11-27 13:02:28 +00:00
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};
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2016-11-27 13:06:57 +00:00
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callable_base* _fun;
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2016-11-27 13:00:34 +00:00
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public:
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2016-11-27 13:06:57 +00:00
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Function() {}
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template <typename Fun>
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Function& operator=(Fun fun)
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{
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_fun = new callable<Fun>(fun);
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return *this;
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}
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2016-11-27 13:08:01 +00:00
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Ret operator()(Args... args) const
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{ return _fun->call(std::forward<Args>(args)...); }
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2016-11-27 13:12:06 +00:00
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operator bool() const
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{ return static_cast<bool>(_fun); }
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2016-11-27 13:06:57 +00:00
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~Function() { delete _fun; }
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2016-11-27 12:55:32 +00:00
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};
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