logger.hh

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/*
 * Scroom - Generic viewer for 2D data
 * Copyright (C) 2009-2026 Kees-Jan Dijkzeul
 *
 * SPDX-License-Identifier: LGPL-2.1
 */
 
#pragma once
 
#include <memory>
 
#include <spdlog/spdlog.h>
 
namespace Scroom
{
  namespace Detail
  {
    // Including this header clears the spdlog default logger, causing any code
    // that still uses spdlog free functions (spdlog::info() etc.) to crash.
    // Use Scroom::Logger instead.
    struct ClearDefaultLogger
    {
      ClearDefaultLogger() { spdlog::set_default_logger(nullptr); }
    };
 
    inline const ClearDefaultLogger clearDefaultLogger;
 
  } // namespace Detail
 
  class LoggerContainer
  {
  public:
    using Ptr = std::shared_ptr<LoggerContainer>;
 
  private:
    mutable std::mutex mut;
    std::shared_ptr<spdlog::logger> logger;
 
  public:
    static Ptr instance();
 
    LoggerContainer();
 
    std::shared_ptr<spdlog::logger> get() const;
    void set(std::shared_ptr<spdlog::logger> logger_);
  };
 
  class Logger
  {
  private:
    LoggerContainer::Ptr container;
 
  public:
    Logger();
    explicit Logger(LoggerContainer::Ptr container_);
 
    std::shared_ptr<spdlog::logger> operator->() const;
  };
 
} // namespace Scroom