Mutating Definition

verb

Present participle of mutate.

Wiktionary
adjective

Causing or tending to cause mutation.

The mutating process that cells undergo can lead to cancer.
Std::sort is a mutating algorithm.
Wiktionary
(programming, of an object) Having the ability to make changes to data other than its makeup.
The begin member of std::string returns a mutating iterator.
Wiktionary