language_standard.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_VERSION_LANGUAGE_STANDARD_HPP
#define TETL_VERSION_LANGUAGE_STANDARD_HPP
 
#include <etl/_config/all.hpp>
 
namespace etl {
 
/// \brief Enumeration for the currently selected C++ standard version. Unlike
/// the official macro `__cplusplus`, these values only include the published
/// year. This is to make the actual values smaller and therfore fit on smaller
/// word sized chips.
enum struct language_standard : unsigned char {
    cpp_17 = 17,
    cpp_20 = 20,
    cpp_23 = 23,
    cpp_26 = 26,
};
 
/// \brief Compares language_standards
[[nodiscard]] constexpr auto operator==(language_standard lhs, language_standard rhs) noexcept -> bool
{
    return static_cast<unsigned char>(lhs) == static_cast<unsigned char>(rhs);
}
 
[[nodiscard]] constexpr auto operator!=(language_standard lhs, language_standard rhs) noexcept -> bool
{
    return !(lhs == rhs);
}
 
[[nodiscard]] constexpr auto operator<(language_standard lhs, language_standard rhs) noexcept -> bool
{
    return static_cast<unsigned char>(lhs) < static_cast<unsigned char>(rhs);
}
 
[[nodiscard]] constexpr auto operator<=(language_standard lhs, language_standard rhs) noexcept -> bool
{
    return static_cast<unsigned char>(lhs) <= static_cast<unsigned char>(rhs);
}
 
[[nodiscard]] constexpr auto operator>(language_standard lhs, language_standard rhs) noexcept -> bool
{
    return static_cast<unsigned char>(lhs) > static_cast<unsigned char>(rhs);
}
 
[[nodiscard]] constexpr auto operator>=(language_standard lhs, language_standard rhs) noexcept -> bool
{
    return static_cast<unsigned char>(lhs) >= static_cast<unsigned char>(rhs);
}
 
#if defined(_MSVC_LANG)
    #define TETL_CPP_STANDARD_FULL _MSVC_LANG
#else
    #define TETL_CPP_STANDARD_FULL __cplusplus
#endif
 
#if TETL_CPP_STANDARD_FULL > 202302L
    #define TETL_CPP_STANDARD 26
/// The currently configured C++ standard.
inline constexpr auto current_standard = language_standard::cpp_26;
#elif TETL_CPP_STANDARD_FULL > 202002L
    #define TETL_CPP_STANDARD 23
/// The currently configured C++ standard.
inline constexpr auto current_standard = language_standard::cpp_23;
#else
    #error "Unsupported C++ language standard. TETL requires at least C++23"
#endif
 
} // namespace etl
 
#endif // TETL_VERSION_LANGUAGE_STANDARD_HPP