source_location.h

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// BSD 3-Clause License
// Copyright (c) 2025, 🍀☀🌕🌥 🌊
// See the LICENSE file in the project root for full license information.
 
#pragma once
 
#include "../config/feature_flags.h"
 
#if KCENON_HAS_SOURCE_LOCATION
    #include <source_location>
#endif
 
namespace kcenon::common {
 
#if KCENON_HAS_SOURCE_LOCATION
    // Use std::source_location when available (C++20)
    using source_location = std::source_location;
#else
    // Custom implementation for C++17 using compiler builtins
    struct source_location {
    public:
        // Prevent accidental copying of the default argument
        constexpr source_location(
            const char* file = __builtin_FILE(),
            const char* function = __builtin_FUNCTION(),
            int line = __builtin_LINE()
        ) noexcept
            : file_(file), function_(function), line_(line), column_(0) {}
 
        constexpr const char* file_name() const noexcept { return file_; }
        constexpr const char* function_name() const noexcept { return function_; }
        constexpr int line() const noexcept { return line_; }
        constexpr int column() const noexcept { return column_; }
 
        // Factory method to create a source_location at the call site
        static constexpr source_location current(
            const char* file = __builtin_FILE(),
            const char* function = __builtin_FUNCTION(),
            int line = __builtin_LINE()
        ) noexcept {
            return source_location(file, function, line);
        }
 
    private:
        const char* file_;
        const char* function_;
        int line_;
        int column_;
    };
#endif
 
} // namespace kcenon::common