Automatic variable: Difference between revisions

Revision as of 21:30, 9 January 2021

Revision as of 15:15, 31 March 2021

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In C, using the storage class <code>register</code> is a hint to the compiler to cache the variable in a processor register. Other than not allowing the referencing operator (<code>&</code>) to be used on the variable or any of its subcomponents, the compiler is free to ignore the hint.

In C++, the constructor of automatic variables is called when the execution reaches the place of declaration. The destructor is called when it reaches the end of the given program block (program blocks are surrounded by curly brackets). This feature is often used to manage resource allocation and deallocation, like opening and then automatically closing files or freeing up memory. See [[Resource Acquisition Is Initialization]] (RAII). Note, C++11 has a new <code>auto</code> specifier[,<ref>{{citation| url=http://en.cppreference.com/w/cpp/language/auto],| title=Placeholder type specifiers| website=cppreference.com}}</ref> which is different. In this case, the variable's type is [[type inference|inferred]].

===Java===