标准库头文件 <source_location>

namespace std {
  struct source_location;
}

namespace std {
  struct source_location {
    // 源位置构造
    static consteval source_location current() noexcept;
    constexpr source_location() noexcept;
 
    // 源位置域访问
    constexpr uint_least32_t line() const noexcept;
    constexpr uint_least32_t column() const noexcept;
    constexpr const char* file_name() const noexcept;
    constexpr const char* function_name() const noexcept;
 
  private:
    uint_least32_t line_;               // 仅为阐释
    uint_least32_t column_;             // 仅为阐释
    const char* file_name_;             // 仅为阐释
    const char* function_name_;         // 仅为阐释
  };
}