56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
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#include "rxcpp/rx.hpp"
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#include "rxcpp/rx-test.hpp"
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#include "catch.hpp"
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#include <array>
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SCENARIO("ref_count other diamond sample"){
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printf("//! [ref_count other diamond sample]\n");
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/*
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* Implements the following diamond graph chain with publish+ref_count without using threads.
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* This version is composable because it does not use connect explicitly.
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*
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* Values
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* / \
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* *2 *100
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* \ /
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* Merge
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* |
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* RefCount
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*/
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std::array<double, 5> a={{1.0, 2.0, 3.0, 4.0, 5.0}};
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auto values = rxcpp::observable<>::iterate(a)
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// The root of the chain is only subscribed to once.
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.tap([](double v) { printf("[0] OnNext: %lf\n", v); })
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.publish();
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auto values_to_long = values.map([](double v) { return (long) v; });
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// Left side multiplies by 2.
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auto left = values_to_long.map(
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[](long v) -> long {printf("[1] OnNext: %ld -> %ld\n", v, v*2); return v * 2L;} );
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// Right side multiplies by 100.
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auto right = values_to_long.map(
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[](long v) -> long {printf("[2] OnNext: %ld -> %ld\n", v, v*100); return v * 100L; });
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// Merge the left,right sides together.
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// The items are emitted interleaved ... [left1, right1, left2, right2, left3, right3, ...].
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auto merged = left.merge(right);
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// When this value is subscribed to, it calls connect on values.
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auto connect_on_subscribe = merged.ref_count(values);
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// This immediately starts emitting all values and blocks until they are completed.
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connect_on_subscribe.subscribe(
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[](long v) { printf("[3] OnNext: %ld\n", v); },
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[&]() { printf("[3] OnCompleted:\n"); });
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printf("//! [ref_count other diamond sample]\n");
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}
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// see also examples/doxygen/publish.cpp for non-ref_count diamonds
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