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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "opentelemetry/version.h"
#if defined(OPENTELEMETRY_STL_VERSION)
# if OPENTELEMETRY_STL_VERSION >= 2017
# include "opentelemetry/std/variant.h"
# define OPENTELEMETRY_HAVE_STD_VARIANT
# endif
#endif
#if !defined(OPENTELEMETRY_HAVE_STD_VARIANT)
# ifndef HAVE_ABSEIL
// We use a LOCAL snapshot of Abseil that is known to compile with Visual Studio 2015.
// Header-only. Without compiling the actual Abseil binary. As Abseil moves on to new
// toolchains, it may drop support for Visual Studio 2015 in future versions.
# if defined(__EXCEPTIONS)
# include <exception>
OPENTELEMETRY_BEGIN_NAMESPACE
namespace nostd
{
class bad_variant_access : public std::exception
{
public:
virtual const char *what() const noexcept override { return "bad_variant_access"; }
};
[[noreturn]] inline void throw_bad_variant_access()
{
throw bad_variant_access{};
}
} // namespace nostd
OPENTELEMETRY_END_NAMESPACE
# define THROW_BAD_VARIANT_ACCESS opentelemetry::nostd::throw_bad_variant_access()
# else
# define THROW_BAD_VARIANT_ACCESS std::terminate()
# endif
# endif
# ifdef _MSC_VER
// Abseil variant implementation contains some benign non-impacting warnings
// that should be suppressed if compiling with Visual Studio 2017 and above.
# pragma warning(push)
# pragma warning(disable : 4245) // conversion from int to const unsigned _int64
# pragma warning(disable : 4127) // conditional expression is constant
# endif
# ifdef HAVE_ABSEIL
# include "absl/types/variant.h"
# else
# include "opentelemetry/nostd/internal/absl/types/variant.h"
# endif
# ifdef _MSC_VER
# pragma warning(pop)
# endif
OPENTELEMETRY_BEGIN_NAMESPACE
namespace nostd
{
# ifdef HAVE_ABSEIL
using absl::bad_variant_access;
using absl::get;
using absl::get_if;
using absl::holds_alternative;
using absl::monostate;
using absl::variant;
using absl::variant_alternative_t;
using absl::variant_size;
using absl::visit;
# else
using absl::OTABSL_OPTION_NAMESPACE_NAME::get;
using absl::OTABSL_OPTION_NAMESPACE_NAME::get_if;
using absl::OTABSL_OPTION_NAMESPACE_NAME::holds_alternative;
using absl::OTABSL_OPTION_NAMESPACE_NAME::monostate;
using absl::OTABSL_OPTION_NAMESPACE_NAME::variant;
using absl::OTABSL_OPTION_NAMESPACE_NAME::variant_alternative_t;
using absl::OTABSL_OPTION_NAMESPACE_NAME::variant_size;
using absl::OTABSL_OPTION_NAMESPACE_NAME::visit;
# endif
} // namespace nostd
OPENTELEMETRY_END_NAMESPACE
#endif /* OPENTELEMETRY_HAVE_STD_VARIANT */