49 lines
2.2 KiB
C++
49 lines
2.2 KiB
C++
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "opentelemetry/plugin/detail/loader_info.h"
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#include "opentelemetry/plugin/factory.h"
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#include "opentelemetry/version.h"
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#ifdef _WIN32
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/**
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* Cross-platform helper macro to declare the symbol used to load an OpenTelemetry implementation
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* as a plugin.
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*
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* Note: The symbols use weak linkage so as to support using an OpenTelemetry both as a regular
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* library and a dynamically loaded plugin. The weak linkage allows for multiple implementations to
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* be linked in without getting multiple definition errors.
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*/
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# define OPENTELEMETRY_DEFINE_PLUGIN_HOOK(X) \
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extern "C" { \
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extern __declspec(dllexport) \
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opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl; \
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\
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__declspec(selectany) \
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opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl = X; \
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} // extern "C"
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#else
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# define OPENTELEMETRY_DEFINE_PLUGIN_HOOK(X) \
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extern "C" { \
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__attribute(( \
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weak)) extern opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl; \
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\
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opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl = X; \
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} // extern "C"
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#endif
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OPENTELEMETRY_BEGIN_NAMESPACE
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namespace plugin
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{
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using OpenTelemetryHook =
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nostd::unique_ptr<Factory::FactoryImpl> (*)(const LoaderInfo &loader_info,
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nostd::unique_ptr<char[]> &error_message);
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} // namespace plugin
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OPENTELEMETRY_END_NAMESPACE
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