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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 value.cpp}
Convert From AD to its Base Type: Example and Test
##################################################
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end value.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
bool Value(void)
{ bool ok = true;
using CppAD::AD;
using CppAD::Value;
// domain space vector
size_t n = 2;
CPPAD_TESTVECTOR(AD<double>) x(n);
x[0] = 3.;
x[1] = 4.;
// check value before recording
ok &= (Value(x[0]) == 3.);
ok &= (Value(x[1]) == 4.);
// 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[1];
// cannot call Value(x[j]) or Value(y[0]) here (currently variables)
AD<double> p = 5.; // p is a parameter (does not depend on x)
ok &= (Value(p) == 5.);
// create f: x -> y and stop tape recording
CppAD::ADFun<double> f(x, y);
// can call Value(x[j]) or Value(y[0]) here (currently parameters)
ok &= (Value(x[0]) == 3.);
ok &= (Value(x[1]) == 4.);
ok &= (Value(y[0]) == -4.);
return ok;
}
// END C++
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