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// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
// SPDX-FileCopyrightText: Bradley M. Bell <bradbell@seanet.com>
// SPDX-FileContributor: 2003-22 Bradley M. Bell
// ----------------------------------------------------------------------------
/*
{xrst_begin unary_plus.cpp}
AD Unary Plus Operator: Example and Test
########################################
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end unary_plus.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
bool unary_plus(void)
{ bool ok = true;
using CppAD::AD;
// domain space vector
size_t n = 1;
CPPAD_TESTVECTOR(AD<double>) x(n);
x[0] = 3.;
// declare independent variables and start tape recording
CppAD::Independent(x);
// range space vector
size_t m = 1;
CPPAD_TESTVECTOR(AD<double>) y(m);
y[0] = + x[0];
// create f: x -> y and stop tape recording
CppAD::ADFun<double> f(x, y);
// check values
ok &= ( y[0] == 3. );
// forward computation of partials w.r.t. x[0]
CPPAD_TESTVECTOR(double) dx(n);
CPPAD_TESTVECTOR(double) dy(m);
size_t p = 1;
dx[0] = 1.;
dy = f.Forward(p, dx);
ok &= ( dy[0] == 1. ); // dy[0] / dx[0]
// reverse computation of dertivative of y[0]
CPPAD_TESTVECTOR(double) w(m);
CPPAD_TESTVECTOR(double) dw(n);
w[0] = 1.;
dw = f.Reverse(p, w);
ok &= ( dw[0] == 1. ); // dy[0] / dx[0]
// use a VecAD<Base>::reference object with unary plus
CppAD::VecAD<double> v(1);
AD<double> zero(0);
v[zero] = x[0];
AD<double> result = + v[zero];
ok &= (result == y[0]);
return ok;
}
// END C++
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