1 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information. 2 3 #pragma once 4 5 #if !defined(RXCPP_SOURCES_RX_NEVER_HPP) 6 #define RXCPP_SOURCES_RX_NEVER_HPP 7 8 #include "../rx-includes.hpp" 9 10 /*! \file rx-never.hpp 11 12 \brief Returns an observable that never sends any items or notifications to observer. 13 14 \tparam T the type of (not) emitted items 15 16 \return Observable that never sends any items or notifications to observer. 17 18 \sample 19 \snippet never.cpp never sample 20 \snippet output.txt never sample 21 */ 22 23 namespace rxcpp { 24 25 namespace sources { 26 27 namespace detail { 28 29 template<class T> 30 struct never : public source_base<T> 31 { 32 template<class Subscriber> 33 void on_subscribe(Subscriber) const { 34 } 35 }; 36 37 } 38 39 /*! @copydoc rx-never.hpp 40 */ 41 template<class T> 42 auto never() 43 -> observable<T, detail::never<T>> { 44 return observable<T, detail::never<T>>(detail::never<T>()); 45 } 46 47 } 48 49 } 50 51 #endif 52
