9.2/includes/opentelemetry/detail/preprocessor.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
// NOTE - code within detail namespace implements internal details, and not part
// of the public interface.
 
#pragma once
 
#define OPENTELEMETRY_STRINGIFY(S) OPENTELEMETRY_STRINGIFY_(S)
#define OPENTELEMETRY_STRINGIFY_(S) #S
 
#define OPENTELEMETRY_CONCAT(A, B) OPENTELEMETRY_CONCAT_(A, B)
#define OPENTELEMETRY_CONCAT_(A, B) A##B
 
// Import the C++20 feature-test macros
#ifdef __has_include
#  if __has_include(<version>)
#    include <version>
#  endif
#elif defined(_MSC_VER) && ((defined(__cplusplus) && __cplusplus >= 202002L) || \
                            (defined(_MSVC_LANG) && _MSVC_LANG >= 202002L))
#  if _MSC_VER >= 1922
#    include <version>
#  endif
#endif