Update the Context class

Author: thelfer

include/MGIS/Context.hxx

@@ -124,6 +124,9 @@ namespace mgis {
      * free function.
      */
     void setLogStream(std::shared_ptr<std::ostream>) noexcept;
+    //! \return a pointer to a log stream. This pointer may be null.
+    [[nodiscard]] std::shared_ptr<std::ostream> getLogStreamPointer()
+        const noexcept;
     //! \brief reset the default log stream
     void resetLogStream() noexcept;
     /*!

src/Context.cxx

@@ -1,3 +1,4 @@
+
 /*!
  * \file   src/Context.cxx
  * \brief  This file implements the `Context` class
@@ -37,6 +38,14 @@ namespace mgis {
     this->log_stream = s;
   }  // end of setLogStream
 
+  std::shared_ptr<std::ostream> Context::getLogStreamPointer() const noexcept {
+    if (std::holds_alternative<std::shared_ptr<std::ostream>>(
+            this->log_stream)) {
+      return std::get<std::shared_ptr<std::ostream>>(this->log_stream);
+    }
+    return {};
+  }  // end of getLogStreamPointer
+
   void Context::resetLogStream() noexcept {
     this->log_stream = std::monostate{};
   }