FreeBSD-5.3/share/man/man3/tgmath.3

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.\" $FreeBSD: src/share/man/man3/tgmath.3,v 1.1 2004/08/13 22:43:12 stefanf Exp $
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.Dd Aug 14, 2004
.Os
.Dt TGMATH 3
.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
.Sm off
.Sy f )
,
.Sm on
.Vt double
and
.Vt long double
(suffixed with
.Sy l )
versions.
The arguments that vary across the three functions and have type
.Vt float ,
.Vt 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 ,
.Vt "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 ".Sy Macro" "Sy real function" ".Sy complex function"
.It Sy Macro Ta Sy real function Ta Sy complex function
.It Li acos Ta acos Ta cacos
.It Li asin Ta asin Ta casin
.It Li atan Ta atan Ta catan
.It Li acosh Ta acosh Ta cacosh
.It Li asinh Ta asinh Ta casinh
.It Li atanh Ta atanh Ta catanh
.It Li cos Ta cos Ta ccos
.It Li sin Ta sin Ta csin
.It Li tan  Ta tan Ta ctan
.It Li cosh Ta cosh Ta ccosh
.It Li sinh Ta sinh Ta csinh
.It Li tanh Ta tanh Ta ctanh
.It Li exp Ta exp Ta cexp
.It Li log Ta log Ta clog
.It Li pow Ta pow Ta cpow
.It Li fabs Ta fabs Ta cabs
.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 nexttoward nexttoward nexttoward nexttoward
.It Li atan2 Ta fma Ta llround Ta remainder
.It Li cbrt Ta fmax Ta log10 Ta remquo
.It Li ceil Ta fmin Ta log1p Ta rint
.It Li copysign Ta fmod Ta log2 Ta round
.It Li erf Ta frexp Ta logb Ta scalbn
.It Li erfc Ta hypot Ta lrint Ta scalbln
.It Li exp2 Ta ilogb Ta lround Ta tgamma
.It Li expm1 Ta ldexp Ta nextbyint Ta trunc
.It Li fdim Ta lgamma Ta nextafter
.It Li floor Ta llrint Ta nexttoward
.El
.Pp
The following macros always expand to a complex function:
.Bl -column -offset indent cimag cimag cimag cimag cimag
.It Li carg Ta cimag Ta conj Ta cproj Ta creal
.El
.Pp
This header includes
.In complex.h
and
.In math.h .
.Sh STANDARDS
.In tgmath.h
conforms to
.St -isoC-99 .
.Sh HISTORY
The header
.In tgmath.h
first appeared in
.Fx 5.3 .
.Sh BUGS
.In tgmath.h
cannot be implemented with strictly conforming C code and needs
special compiler support.  The current implementation only works for 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.