.\"
.de Id
..
.de Sp
.if n .sp
.if t .sp 0.4
..
.TH compose 4rheolef "rheolef-7.0" "rheolef-7.0" "rheolef-7.0"
.\" label: /*Class:compose
.SH NAME
\fBcompose\fP - a n-ary function with n fields
.SH DESCRIPTION

Compose a n-ary function f with n fields.
.\" begin_example
.Sp
.nf
        geo omega ("circle");
        space Xh (omega, "P1");
        field uh (Xh, 1.0);
        field vh = interpolate (compose(f,uh));
.Sp
.fi
.\" end_example
The \fBcompose\fP operator could be used in all non-linear expressions
involved in either the \fBinterpolate\fP or the \fBintegrate\fP functions
(see interpolate(4) and integrate(4)).
The \fBf\fP function could be either a usual function or a functor.
.SH CHARACTERISTIC

The \fBcompose\fP function supports also the characteristic algorithm
(see characteristic(2))
used for convection.
.\" begin_example
.Sp
.nf
        characteristic X (-delta_t*uh);
        test v (Xh);
        field lh = integrate (compose(uh,X)*v);
.Sp
.fi
.\" end_example
.SH IMPLEMENTATION

The n-arity bases on the variadic template feature of the 2011 c++ normalisation.
When this feature is not available, only unary and binary functions are supported.
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.\" END

.\" LENGTH = 3
.SH SEE ALSO
interpolate(4), integrate(4), characteristic(2)
.SH COPYRIGHT
Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito@imag.fr> GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.