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+.\" $NetBSD: tgmath.3,v 1.9 2014/03/18 18:20:39 riastradh Exp $
+.\"
+.\" Copyright (c) 2004 Stefan Farfeleder
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD: src/share/man/man3/tgmath.3,v 1.3 2007/12/15 02:40:10 das Exp $
+.\"
+.Dd December 14, 2010
+.Dt TGMATH 3
+.Os
+.Sh NAME
+.Nm tgmath
+.Nd "type-generic macros"
+.Sh SYNOPSIS
+.In tgmath.h
+.Sh DESCRIPTION
+The header
+.In tgmath.h
+provides type-generic macros
+for
+.In math.h
+and
+.In complex.h
+functions that have
+.Vt float
+(suffixed with
+.Sy f ) ,
+.Vt double ,
+and
+.Vt "long double"
+(suffixed with
+.Sy l )
+versions.
+The arguments that vary across the three functions and have type
+.Vt float , double ,
+and
+.Vt "long double" ,
+respectively, are called
+.Em "generic arguments" .
+.Pp
+The following rules describe which function is actually called if a
+type-generic macro is invoked.
+If any generic argument has type
+.Vt "long double"
+or
+.Vt "long double complex" ,
+the
+.Vt "long double"
+function is called.
+Else, if any generic argument has type
+.Vt double , "double complex" ,
+or an integer type, the
+.Vt double
+version is invoked.
+Otherwise, the macro expands to the
+.Vt float
+implementation.
+.Pp
+For the macros in the following table, both real and complex functions
+exist.
+The real functions are prototyped in
+.In math.h
+and the complex equivalents in
+.In complex.h .
+The complex function is called if any of the generic arguments is a
+complex value.
+Otherwise, the real equivalent is called.
+.Bl -column -offset indent \
+"COMPLEX FUNCTION" "COMPLEX FUNCTION" "COMPLEX FUNCTION"
+.It Sy Macro Ta Sy Real function Ta Sy Complex function
+.It Fn acos Ta Xr acos 3 Ta Xr cacos 3
+.It Fn asin Ta Xr asin 3 Ta Xr casin 3
+.It Fn atan Ta Xr atan 3 Ta Xr catan 3
+.It Fn acosh Ta Xr acosh 3 Ta Xr cacosh 3
+.It Fn asinh Ta Xr asinh 3 Ta Xr casinh 3
+.It Fn atanh Ta Xr atanh 3 Ta Xr catanh 3
+.It Fn cos Ta Xr cos 3 Ta Xr ccos 3
+.It Fn sin Ta Xr sin 3 Ta Xr csin 3
+.It Fn tan  Ta Xr tan 3 Ta Xr ctan 3
+.It Fn cosh Ta Xr cosh 3 Ta Xr ccosh 3
+.It Fn sinh Ta Xr sinh 3 Ta Xr csinh 3
+.It Fn tanh Ta Xr tanh 3 Ta Xr ctanh 3
+.It Fn exp Ta Xr exp 3 Ta Xr cexp 3
+.It Fn log Ta Xr log 3 Ta Xr clog 3
+.It Fn pow Ta Xr pow 3 Ta Xr cpow 3
+.It Fn sqrt Ta Xr sqrt 3 Ta Xr csqrt 3
+.It Fn fabs Ta Xr fabs 3 Ta Xr cabs 3
+.El
+.Pp
+No complex functions exist for the following macros, so passing a
+complex value to a generic argument invokes undefined behaviour:
+.Bl -column -offset indent ".Fn nexttoward" ".Fn nexttoward" ".Fn nexttoward"
+.It Xr atan2 3 Ta Fn fma Ta Fn llround Ta Xr remainder 3
+.It Xr cbrt 3 Ta Xr fmax 3 Ta Xr log10 3 Ta Fn remquo
+.It Xr ceil 3 Ta Xr fmin 3 Ta Xr log1p 3 Ta Xr rint 3
+.It Xr copysign 3 Ta Xr fmod 3 Ta Xr log2 3 Ta Xr round 3
+.It Xr erf 3 Ta Xr frexp 3 Ta Xr logb 3 Ta Xr scalbn 3
+.It Xr erfc 3 Ta Xr hypot 3 Ta Xr lrint 3 Ta Fn tgamma
+.It Xr exp2 3 Ta Xr ilogb 3 Ta Fn lround Ta Xr trunc 3
+.It Xr expm1 3 Ta Xr ldexp 3 Ta Xr nextafter 3
+.It Xr fdim 3 Ta Xr lgamma 3 Ta
+.It Xr floor 3 Ta Xr llrint 3 Ta
+.El
+.Pp
+The following macros always expand to a complex function:
+.Bl -column -offset indent ".Fn cimag" ".Fn cimag" ".Fn cimag" ".Fn cimag" ".Fn cimag"
+.It Xr carg 3 Ta Xr cimag 3 Ta Xr conj 3 Ta Fn cproj Ta Xr creal 3
+.El
+.Pp
+This header includes
+.In complex.h
+and
+.In math.h .
+.Sh STANDARDS
+The header
+.In tgmath.h
+conforms to
+.St -isoC-99 .
+.Sh AUTHORS
+.An Matt Thomas Aq Mt matt@3am-software.com
+.Sh BUGS
+The header
+.In tgmath.h
+cannot be implemented with strictly conforming C code and needs
+special compiler support.
+The current implementation only works for
+.Tn GCC .
+.Pp
+Many of the functions mentioned here are not prototyped in
+.In math.h
+or
+.In complex.h
+as they are not yet implemented.