GNU Scientific Library – Reference Manual: Deprecated Functions

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### 2.13 Deprecated Functions

From time to time, it may be necessary for the definitions of some functions to be altered or removed from the library. In these circumstances the functions will first be declared deprecated and then removed from subsequent versions of the library. Functions that are deprecated can be disabled in the current release by setting the preprocessor definition `GSL_DISABLE_DEPRECATED`. This allows existing code to be tested for forwards compatibility.