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Line 355: ====Nested function and function pointer (C)==== With a [[GNU Compiler Collection]] (GCC) extension, a [nested function<ref>{{cite web \|url = https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html \|title ~~nested~~= ~~function]~~Nested functions}}</ref> can be used and a function pointer can emulate closures, providing the function does not exit the containing scope. The next example is invalid because <code>adder</code> is a top-level definition (depending on compiler version, it could produce a correct result if compiled with no optimizing, i.e., at <code>-O0</code>): <syntaxhighlight lang="c">

Closure (computer programming): Difference between revisions