Program Listing for File span_context_kv_iterable.h
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "opentelemetry/common/attribute_value.h"
#include "opentelemetry/common/key_value_iterable_view.h"
#include "opentelemetry/nostd/function_ref.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace trace
{
class SpanContextKeyValueIterable
{
public:
virtual ~SpanContextKeyValueIterable() = default;
virtual bool ForEachKeyValue(
nostd::function_ref<bool(SpanContext, const opentelemetry::common::KeyValueIterable &)>
callback) const noexcept = 0;
virtual size_t size() const noexcept = 0;
};
class NullSpanContext : public SpanContextKeyValueIterable
{
public:
bool ForEachKeyValue(
nostd::function_ref<bool(SpanContext, const opentelemetry::common::KeyValueIterable &)>
/* callback */) const noexcept override
{
return true;
}
size_t size() const noexcept override { return 0; };
};
} // namespace trace
OPENTELEMETRY_END_NAMESPACE