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24 lines
529 B
C++
24 lines
529 B
C++
/*
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* Copyright (C) 2025-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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#pragma once
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#include <seastar/core/sharded.hh>
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#include <seastar/core/shard_id.hh>
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// When passed to sharded<>::start(), translates to "val" passed to sharded instances on shard 0 and T{} on other shards.
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template <typename T>
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auto only_on_shard0(T val) {
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return sharded_parameter([val] {
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if (seastar::this_shard_id() == 0) {
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return val;
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}
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return T{};
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});
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}
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