config.hpp

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// SPDX-License-Identifier: MIT
#pragma once
#ifndef _TIME_SHIELD_CONFIG_HPP_INCLUDED
#define _TIME_SHIELD_CONFIG_HPP_INCLUDED

 
#include <atomic>
 
#if defined(_MSVC_LANG)
#   define TIME_SHIELD_CXX_VERSION _MSVC_LANG
#else
#   define TIME_SHIELD_CXX_VERSION __cplusplus
#endif
 
// Check and define macros based on the C++ standard version
#if TIME_SHIELD_CXX_VERSION >= 201703L
#   define TIME_SHIELD_CPP17
#elif TIME_SHIELD_CXX_VERSION >= 201402L
#   define TIME_SHIELD_CPP14
#elif TIME_SHIELD_CXX_VERSION >= 201103L
#   define TIME_SHIELD_CPP11
#else
#   error "C++11 or newer is required to compile this library."
#endif
 
// Configure support for `constexpr` and `if constexpr` based on the C++ standard
#ifdef TIME_SHIELD_CPP11
#   define  TIME_SHIELD_IF_CONSTEXPR
#   define  TIME_SHIELD_CONSTEXPR
#else
#ifdef TIME_SHIELD_CPP14
#   define  TIME_SHIELD_IF_CONSTEXPR
#   define  TIME_SHIELD_CONSTEXPR       constexpr
#else
#ifdef TIME_SHIELD_CPP17
#   define  TIME_SHIELD_IF_CONSTEXPR    constexpr
#   define  TIME_SHIELD_CONSTEXPR       constexpr
#endif
#endif
#endif
 
// Configure nodiscard attribute support while keeping compatibility with C++11 compilers
#if defined(__has_cpp_attribute)
#   if __has_cpp_attribute(nodiscard) && defined(TIME_SHIELD_CPP17)
#       define TIME_SHIELD_NODISCARD [[nodiscard]]
#   else
#       define TIME_SHIELD_NODISCARD
#   endif
#else
#   if defined(TIME_SHIELD_CPP17)
#       define TIME_SHIELD_NODISCARD [[nodiscard]]
#   else
#       define TIME_SHIELD_NODISCARD
#   endif
#endif
 
// Attribute helpers
#if defined(TIME_SHIELD_CPP17)
#   define TIME_SHIELD_MAYBE_UNUSED [[maybe_unused]]
#else
#   define TIME_SHIELD_MAYBE_UNUSED
#endif
 
// Configure thread-local storage handling for compilers with partial support
#if defined(__cpp_thread_local)
#   define TIME_SHIELD_THREAD_LOCAL thread_local
#elif defined(_MSC_VER)
#   define TIME_SHIELD_THREAD_LOCAL __declspec(thread)
#elif defined(__GNUC__)
#   define TIME_SHIELD_THREAD_LOCAL __thread
#else
#   define TIME_SHIELD_THREAD_LOCAL
#endif
 

#if defined(_WIN32)
#   define TIME_SHIELD_PLATFORM_WINDOWS 1
#else
#   define TIME_SHIELD_PLATFORM_WINDOWS 0
#endif
 
#if defined(__unix__) || defined(__unix) || defined(unix) || \
    (defined(__APPLE__) && defined(__MACH__))
#   define TIME_SHIELD_PLATFORM_UNIX 1
#else
#   define TIME_SHIELD_PLATFORM_UNIX 0
#endif

#if TIME_SHIELD_PLATFORM_WINDOWS
#   define TIME_SHIELD_HAS_WINSOCK 1
#else
#   define TIME_SHIELD_HAS_WINSOCK 0
#endif

#ifndef TIME_SHIELD_ENABLE_NTP_CLIENT
#   if TIME_SHIELD_HAS_WINSOCK || TIME_SHIELD_PLATFORM_UNIX
#       define TIME_SHIELD_ENABLE_NTP_CLIENT 1
#   else
#       define TIME_SHIELD_ENABLE_NTP_CLIENT 0
#   endif
#endif
 
#endif // _TIME_SHIELD_CONFIG_HPP_INCLUDED