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Object lifetime
In object-oriented programming (OOP), object lifetime is the period of time between an object's creation and its destruction. In some programming contexts, object lifetime coincides with the lifetime of a variable that represents the object. In other contexts – where the object is accessed by reference – object lifetime is not determined by the lifetime of a variable. For example, destruction of the variable may only destroy the reference; not the referenced object.
Creation of an object is generally deterministic, but destruction varies by programming context. Some contexts allow for deterministic destruction, but some do not. Notably, in a garbage-collection environment, objects are destroyed when the garbage collector chooses.
The syntax for creation and destruction varies by programming context. In many contexts, including C++, C# and Java, an object is created via special syntax like new typename(). In C++, that provides manual memory management, an object is destroyed via the delete keyword. In C# and Java, with no explicit destruction syntax, the garbage collector destroys unused objects automatically.
An alternative and deterministic approach to automatic destruction is where the object is destroyed when code decrements the object's reference count to zero.
With an object pool, where objects may be created ahead of time and reused, the apparent creation and destruction of an object may not correspond to actual. The pool provides reinitialization for creation and finalization for destruction. Both creation and destruction may be non-deterministic.
Objects with static memory allocation have a lifetime that coincides with the run of a program, but the order of creation and destruction of the various static objects is generally non-deterministic.
Object life cycle refers to the events that an object experiences including and between creation and destruction.
Life cycle generally includes memory management and operations after allocation and before deallocation. Object creation generally consists of memory allocation and initialization where initialization includes assigning values to fields and running initialization code. Object destruction generally consists of finalization (a.k.a. cleanup) and memory deallocation (a.k.a. free). These steps generally proceed in order as: allocate, initialize, finalize, deallocate.
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Object lifetime
In object-oriented programming (OOP), object lifetime is the period of time between an object's creation and its destruction. In some programming contexts, object lifetime coincides with the lifetime of a variable that represents the object. In other contexts – where the object is accessed by reference – object lifetime is not determined by the lifetime of a variable. For example, destruction of the variable may only destroy the reference; not the referenced object.
Creation of an object is generally deterministic, but destruction varies by programming context. Some contexts allow for deterministic destruction, but some do not. Notably, in a garbage-collection environment, objects are destroyed when the garbage collector chooses.
The syntax for creation and destruction varies by programming context. In many contexts, including C++, C# and Java, an object is created via special syntax like new typename(). In C++, that provides manual memory management, an object is destroyed via the delete keyword. In C# and Java, with no explicit destruction syntax, the garbage collector destroys unused objects automatically.
An alternative and deterministic approach to automatic destruction is where the object is destroyed when code decrements the object's reference count to zero.
With an object pool, where objects may be created ahead of time and reused, the apparent creation and destruction of an object may not correspond to actual. The pool provides reinitialization for creation and finalization for destruction. Both creation and destruction may be non-deterministic.
Objects with static memory allocation have a lifetime that coincides with the run of a program, but the order of creation and destruction of the various static objects is generally non-deterministic.
Object life cycle refers to the events that an object experiences including and between creation and destruction.
Life cycle generally includes memory management and operations after allocation and before deallocation. Object creation generally consists of memory allocation and initialization where initialization includes assigning values to fields and running initialization code. Object destruction generally consists of finalization (a.k.a. cleanup) and memory deallocation (a.k.a. free). These steps generally proceed in order as: allocate, initialize, finalize, deallocate.