SourceLocation.hpp

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//          Copyright Dominic (DNKpp) Koepke 2024-2026.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          https://www.boost.org/LICENSE_1_0.txt)
 
#ifndef MIMICPP_UTILITIES_SOURCE_LOCATION_HPP
#define MIMICPP_UTILITIES_SOURCE_LOCATION_HPP
 
#pragma once
 
#include "mimic++/config/Config.hpp"
#include "mimic++/printing/Fwd.hpp"
 
#ifndef MIMICPP_DETAIL_IS_MODULE
    #include <cstddef>
    #include <string_view>
 
    #ifdef MIMICPP_DETAIL_HAS_SOURCE_LOCATION
        #include <source_location>
    #endif
#endif
 
MIMICPP_DETAIL_MODULE_EXPORT namespace mimicpp::util
{
    class SourceLocation
    {
    public:
        ~SourceLocation() = default;
 
#ifdef MIMICPP_DETAIL_HAS_SOURCE_LOCATION
        [[nodiscard]] //
        explicit(false) constexpr SourceLocation(
            [[maybe_unused]] auto&&... canary,
            std::source_location const& loc = std::source_location::current()) noexcept
            : m_FileName{loc.file_name()},
              m_FunctionName{loc.function_name()},
              m_Line{loc.line()}
        {
            static_assert(0 == sizeof...(canary), "Do not supply custom arguments to util::SourceLocation.");
        }
#else
        [[nodiscard]] //
        explicit(false) constexpr SourceLocation(
            [[maybe_unused]] auto&&... canary,
            std::string_view const fileName = __builtin_FILE(),
            std::string_view const functionName = __builtin_FUNCTION(),
            std::size_t const line = __builtin_LINE()) noexcept
            : m_FileName{fileName},
              m_FunctionName{functionName},
              m_Line{line}
        {
            static_assert(0 == sizeof...(canary), "Do not supply custom arguments to util::SourceLocation.");
        }
#endif
 
        SourceLocation(SourceLocation const&) = default;
        SourceLocation& operator=(SourceLocation const&) = default;
        SourceLocation(SourceLocation&&) = default;
        SourceLocation& operator=(SourceLocation&&) = default;
 
        [[nodiscard]]
        constexpr std::string_view file_name() const noexcept
        {
            return m_FileName;
        }
 
        [[nodiscard]]
        constexpr std::string_view function_name() const noexcept
        {
            return m_FunctionName;
        }
 
        [[nodiscard]]
        constexpr std::size_t line() const noexcept
        {
            return m_Line;
        }
 
        [[nodiscard]]
        friend constexpr bool operator==(SourceLocation const& lhs, SourceLocation const& rhs) noexcept
        {
            return lhs.line() == rhs.line()
                && lhs.file_name() == rhs.file_name()
                && lhs.function_name() == rhs.function_name();
        }
 
    private:
        std::string_view m_FileName;
        std::string_view m_FunctionName;
        std::size_t m_Line;
    };
}
 
#endif