te::common::Singleton< T > Class Template Reference

Template support for singleton pattern. More...

#include <Singleton.h>

Inheritance diagram for te::common::Singleton< T >:

Static Public Member Functions
static T &	getInstance ()
	It returns a reference to the singleton instance. More...

Protected Member Functions
	Singleton ()
	The singleton constructor is protected. More...
	~Singleton ()
	This will avoid clients trying to release pointers to base class. More...

Detailed Description

template<class T>
class te::common::Singleton< T >

Template support for singleton pattern.

In TerraLib, classes that manage resources like DataSourceManager and ProjectManager are singletons. The basic interface of a singleton is defined by this singleton class. If you want to get access to the singleton instance you can write a code like:

DataSourceManager& dsm = DataSourceManager::getInstance();

or

std::vector<DataSource*> datasources = DataSourceManager::getInstance().getDataSourceList();

If you want to use this template class in order to create your singleton class, the type T must satisfy the following requirements:

• It must have an empty constructor;

You can create a singleton class as follow:

class MySingletonClass : public te::common::Singleton<MySingletonClass>
{
  friend class te::common::Singleton<MySingletonClass>;

  public:

    // Singleton methods (just as an example).
    int getId()
    {
      return id;
    }

    ...

  protected:
      
    // Empty constructor
    MySingletonClass()
    {
      ...
    }

  private:

    // My private data
    int id;

    ...
};

Definition at line 100 of file Singleton.h.

Constructor & Destructor Documentation

template<class T >

te::common::Singleton< T >::Singleton ( )

inlineprotected

The singleton constructor is protected.

Definition at line 127 of file Singleton.h.

template<class T >

te::common::Singleton< T >::~Singleton ( )

inlineprotected

This will avoid clients trying to release pointers to base class.

Definition at line 131 of file Singleton.h.

Member Function Documentation

template<class T >

T & te::common::Singleton< T >::getInstance ( )

inlinestatic

It returns a reference to the singleton instance.

Returns

A reference to the singleton instance.

Definition at line 120 of file Singleton.h.

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The documentation for this class was generated from the following file:

• /home/castejon/castejon_files/develop/terralib5/git_master/src/terralib/common/Singleton.h