Resource Management in C++: Listing 5

A mediator resource_access_object applying the RAII idiom.

// resource_access_object.hpp
#include <memory>
#include "shared_resource.hpp"

// RAII-styled object to handle access to the shared resource
class resource_access_object {

  // no copy constructor: either use same object or create new.
  resource_access_object(const resource_access_object&) = delete;


  void do_alpha();
  void do_beta();
  std::unique_ptr<shared_resource> resource_;

// resource_access_object.cpp
#include "resource_access_object.hpp"

resource_access_object() : resource_{create_resource()}
  cout << "RAII over resource " << resource_->id << " built.\n";

~resource_access_object() {
  // a call to shut_suffices here. As resource_ is a unique_ptr, will
  // free its pointer.
  cout << "RAII over resource " << resource_->id << " destroyed.\n";

void do_alpha()
  cout << "RAII over resource " << resource_->id << " doing <alpha>.\n";

void do_beta()
  cout << "RAII over resource " << resource_->id << " doing <beta>.\n";

About the Author

Diego Dagum is a software architect and developer with more than 20 years of experience. He can be reached at [email protected].

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