103 lines
2.8 KiB
C++
103 lines
2.8 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/version.h"
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#if defined(OPENTELEMETRY_STL_VERSION)
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# if OPENTELEMETRY_STL_VERSION >= 2017
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# include "opentelemetry/std/variant.h"
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# define OPENTELEMETRY_HAVE_STD_VARIANT
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# endif
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#endif
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#if !defined(OPENTELEMETRY_HAVE_STD_VARIANT)
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# ifndef HAVE_ABSEIL
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// We use a LOCAL snapshot of Abseil that is known to compile with Visual Studio 2015.
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// Header-only. Without compiling the actual Abseil binary. As Abseil moves on to new
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// toolchains, it may drop support for Visual Studio 2015 in future versions.
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# if defined(__EXCEPTIONS)
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# include <exception>
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OPENTELEMETRY_BEGIN_NAMESPACE
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namespace nostd
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{
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class bad_variant_access : public std::exception
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{
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public:
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virtual const char *what() const noexcept override { return "bad_variant_access"; }
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};
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[[noreturn]] inline void throw_bad_variant_access()
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{
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throw bad_variant_access{};
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}
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} // namespace nostd
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OPENTELEMETRY_END_NAMESPACE
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# define THROW_BAD_VARIANT_ACCESS opentelemetry::nostd::throw_bad_variant_access()
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# else
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# define THROW_BAD_VARIANT_ACCESS std::terminate()
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# endif
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# endif
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# ifdef _MSC_VER
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// Abseil variant implementation contains some benign non-impacting warnings
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// that should be suppressed if compiling with Visual Studio 2017 and above.
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# pragma warning(push)
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# pragma warning(disable : 4245) // conversion from int to const unsigned _int64
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# pragma warning(disable : 4127) // conditional expression is constant
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# endif
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# ifdef HAVE_ABSEIL
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# include "absl/types/variant.h"
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# else
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# include "opentelemetry/nostd/internal/absl/base/options.h"
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namespace absl
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{
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namespace OTABSL_OPTION_NAMESPACE_NAME
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{
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template <class T>
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struct variant_size;
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template <typename... Ts>
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class variant;
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} // namespace OTABSL_OPTION_NAMESPACE_NAME
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} // namespace absl
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# include "opentelemetry/nostd/internal/absl/types/variant.h"
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# endif
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# ifdef _MSC_VER
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# pragma warning(pop)
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# endif
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OPENTELEMETRY_BEGIN_NAMESPACE
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namespace nostd
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{
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# ifdef HAVE_ABSEIL
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using absl::bad_variant_access;
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using absl::get;
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using absl::get_if;
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using absl::holds_alternative;
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using absl::monostate;
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using absl::variant;
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using absl::variant_alternative_t;
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using absl::variant_size;
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using absl::visit;
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# else
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using absl::OTABSL_OPTION_NAMESPACE_NAME::get;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::get_if;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::holds_alternative;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::monostate;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::variant;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::variant_alternative_t;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::variant_size;
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using absl::OTABSL_OPTION_NAMESPACE_NAME::visit;
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# endif
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} // namespace nostd
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OPENTELEMETRY_END_NAMESPACE
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#endif /* OPENTELEMETRY_HAVE_STD_VARIANT */
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