NoOpInstrument.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Distributed Tracing open source project
//
// Copyright (c) 2020-2022 Apple Inc. and the Swift Distributed Tracing project
// authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//

import InstrumentationBaggage

/// A "no op" implementation of an ``InstrumentProtocol``.
public struct NoOpInstrument: InstrumentProtocol {
    public init() {}

    public func inject<Carrier, Inject>(_ baggage: Baggage, into carrier: inout Carrier, using injector: Inject)
        where Inject: Injector, Carrier == Inject.Carrier
    {
        // no-op
    }

    public func extract<Carrier, Extract>(_ carrier: Carrier, into baggage: inout Baggage, using extractor: Extract)
        where Extract: Extractor, Carrier == Extract.Carrier
    {
        // no-op
    }
}