rx-switch_if_empty.hpp File Reference

If the source Observable terminates without emitting any items, emits items from a backup Observable. More...

#include "../rx-includes.hpp"

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Classes
struct	rxcpp::member_overload< switch_if_empty_tag >
struct	rxcpp::member_overload< default_if_empty_tag >

Namespaces
	rxcpp
	rxcpp::operators

Macros
#define	RXCPP_OPERATORS_RX_SWITCH_IF_EMPTY_HPP

Functions
template<class... AN>
auto	rxcpp::operators::switch_if_empty (AN &&...an) -> operator_factory< switch_if_empty_tag, AN... >
	If the source Observable terminates without emitting any items, emits items from a backup Observable. More...
template<class... AN>
auto	rxcpp::operators::default_if_empty (AN &&...an) -> operator_factory< default_if_empty_tag, AN... >
	If the source Observable terminates without emitting any items, emits a default item and completes. More...

Detailed Description

If the source Observable terminates without emitting any items, emits items from a backup Observable.

Template Parameters

BackupSource

the type of the backup observable.

Parameters

t	a backup observable that is used if the source observable is empty.

Returns

Observable that emits items from a backup observable if the source observable is empty.

Sample Code

    auto values = rxcpp::observable<>::empty<int>()
            .switch_if_empty(rxcpp::observable<>::range(1, 5));

    values.subscribe(
            [](int v) { printf("OnNext: %d\n", v); },
            []() { printf("OnCompleted\n"); } );

OnNext: 1
OnNext: 2
OnNext: 3
OnNext: 4
OnNext: 5
OnCompleted

Macro Definition Documentation

#define RXCPP_OPERATORS_RX_SWITCH_IF_EMPTY_HPP