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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\" Linux libc source code
-.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\" 386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>
-.\" Modified 2002-07-27 by Walter Harms
-.\" (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH log2 3 2024-03-12 "Linux man-pages 6.7"
-.SH NAME
-log2, log2f, log2l \- base-2 logarithmic function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double log2(double " x );
-.BI "float log2f(float " x );
-.BI "long double log2l(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR log2 (),
-.BR log2f (),
-.BR log2l ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-These functions return the base-2 logarithm of
-.IR x .
-.SH RETURN VALUE
-On success, these functions return the base-2 logarithm of
-.IR x .
-.P
-For special cases, including where
-.I x
-is 0, 1, negative, infinity, or NaN, see
-.BR log (3).
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-For a discussion of the errors that can occur for these functions, see
-.BR log (3).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR log2 (),
-.BR log2f (),
-.BR log2l ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD.
-.SH SEE ALSO
-.BR cbrt (3),
-.BR clog2 (3),
-.BR log (3),
-.BR log10 (3),
-.BR sqrt (3)