Singleton< T, TInstantiationPolicy, TCreationPolicy, TLifetimePolicy, TLockPolicy > Class Template Reference

A singleton template class that can be freely configured using policies that control the instantiation, creation, lifetime and thread-safety. More...

#include <utils/Singleton.h>

Inheritance diagram for Singleton< T, TInstantiationPolicy, TCreationPolicy, TLifetimePolicy, TLockPolicy >:

Public Types
typedef Base::Type	Type

Static Public Member Functions
static Type &	instance ()
	Returns a reference to the singleton instance. More...
static bool	isDestroyed ()
	Returns true, if the singleton was already destroyed. More...

Detailed Description

template<typename T, template< class > class TInstantiationPolicy = singleton::LazyInstantiation, template< class > class TCreationPolicy = singleton::CreateUsingNew, template< class > class TLifetimePolicy = singleton::NormalLifetime, class TLockPolicy = singleton::MutexLock>
class mira::Singleton< T, TInstantiationPolicy, TCreationPolicy, TLifetimePolicy, TLockPolicy >

A singleton template class that can be freely configured using policies that control the instantiation, creation, lifetime and thread-safety.

Using this template class you can create singletons that meet all your needs by specifying different combination of policies as template parameters.

Instantiation Policies:

• LazyInstantiation
• EagerInstantiation
• ExplicitInstantiation

Creation Policies:

• CreateUsingNew
• CreateStatic
• CreateUsing...Allocator

Lifetime Policies:

• NormalLifetime
• NoDestroyLifetime

Lock Policies:

• MutexLock
• NoLock

Example Usage:

class MySingleton : public Singleton<MySingleton,
                                 singleton::LazyInstantiation,
                                 singleton::CreateUsingNew,
                                 singleton::NormalLifetime,
                                 singleton::NoLock>
{
public:
   ...
   void foo();
};

...

MySingleton::instance().foo();

For convenience some of commonly used policy combinations are provided by

• LazySingleton
• EagerSingleton
• ExplicitSingleton
• LazySingletonNoLock
• LazySingletonNoLock

Member Typedef Documentation

Type

typedef Base::Type Type

Member Function Documentation

instance()

static Type& instance ( )

inlinestatic

Returns a reference to the singleton instance.

Exceptions

XLogical

If the singleton was already destroyed (dead reference) or not yet created (when using ExplicitInstantiation).

isDestroyed()

static bool isDestroyed ( )

inlinestatic

Returns true, if the singleton was already destroyed.

Trying to access it will result in an exception.

---

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

• base/include/utils/Singleton.h