Editing Object lifetime (section)

==Examples==

===C++===

A [[C++]] class can be declared with defaults as:

<syntaxhighlight lang="cpp">
class Foo {};
</syntaxhighlight>

When declared in an automatic context, the object is destroyed at the close of the block it is declared.

<syntaxhighlight lang="cpp">
int bar() {
  Foo foo;
  // foo is destroyed here
}
</syntaxhighlight>

When created dynamically, it lives until it is explicitly destroyed.

<syntaxhighlight lang="cpp">
int bar() {
  Foo *pFoo = new Foo();
  delete pFoo;
}
</syntaxhighlight>

===Java===

A [[Java (programming language)|Java]] class can be declared with defaults as:

<syntaxhighlight lang="java">
class Foo {}
</syntaxhighlight>

After an instance is created (i.e. <code>new Foo()</code>) it lives until it has no references and the garbage collector deletes it.

===Rust===
{{Further|Rust (programming language)#Lifetimes}}
[[Rust (programming language)|Rust]] uses lifetime annotations to declare the lifetime of arguments passed into a function. The lifetime is declared in the function signature within angle brackets. In this example a reference to the struct {{Mono|File}} is passed into the {{Mono|example}} function with the lifetime annotation {{Mono|'a}}.

<syntaxhighlight lang="rust">
fn example<'a>(file: &'a File) {
    // ...
}
</syntaxhighlight>