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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: 2023-23 Bradley M. Bell
# include <cppad/cppad.hpp>
# include <cppad/local/val_graph/tape.hpp>
# include <cppad/local/val_graph/val2fun.hpp>
/*
{xrst_begin val_val2fun_xam.cpp dev}
Example ADFun From Value Graph
##############################
{xrst_literal
// BEGIN_C++
// END_C++
}
{xrst_end val_val2fun_xam.cpp}
*/
// BEGIN_C++
bool val2fun_xam(void)
{ bool ok = true;
//
// tape_t, Vector, addr_t, add_op_enum;
using CppAD::local::val_graph::tape_t;
using CppAD::local::val_graph::Vector;
using CppAD::local::val_graph::addr_t;
using CppAD::local::val_graph::op_enum_t;
op_enum_t add_op_enum = CppAD::local::val_graph::add_op_enum;
op_enum_t sub_op_enum = CppAD::local::val_graph::sub_op_enum;
//
// tape, ok
tape_t<double> tape;
addr_t n_ind = 4;
addr_t index_of_nan = tape.set_ind(n_ind);
ok &= index_of_nan == n_ind;
//
// op_arg
Vector<addr_t> op_arg(2);
//
// dep_vec
Vector<addr_t> dep_vec(2);
//
// addr_tmp
addr_t addr_tmp;
//
// tape
//
// addr_tmp = p[0] - p[1]
op_arg[0] = 0; // p[0]
op_arg[1] = 1; // p[1]
addr_tmp = tape.record_op(sub_op_enum, op_arg);
//
// dep_vec[0] = x[0] + p[0] - p[1]
op_arg[0] = 2; // x[0]
op_arg[1] = addr_tmp; // p[0] - p[1]
dep_vec[0] = tape.record_op(add_op_enum, op_arg);
//
// addr_tmp = p[1] - p[0]
op_arg[0] = 1; // p[1]
op_arg[1] = 0; // p[0]
addr_tmp = tape.record_op(sub_op_enum, op_arg);
//
// dep_vec[1] = x[1] + p[1] - p[0]
op_arg[0] = 3; // x[1]
op_arg[1] = addr_tmp; // p[1] - p[0]
dep_vec[1] = tape.record_op(add_op_enum, op_arg);
//
// set_dep
tape.set_dep( dep_vec );
/*
// trace
bool trace = true;
Vector<double> val_vec( tape.n_val() );
for(addr_t i = 0; i < n_ind; ++i)
val_vec[i] = double(5 + i);
tape.eval(trace, val_vec);
*/
// ADFun
Vector<size_t> dyn_ind(2), var_ind(2);
dyn_ind[0] = 0;
dyn_ind[1] = 1;
var_ind[0] = 2;
var_ind[1] = 3;
CppAD::ADFun<double> f;
f.val2fun( tape, dyn_ind, var_ind );
//
// p, x
Vector<double> p(2), x(2), y(2);
p[0] = 5.0;
p[1] = 6.0;
x[0] = 7.0;
x[1] = 8.0;
//
// f, y
f.new_dynamic(p);
y = f.Forward(0, x);
//
ok &= y[0] == x[0] + p[0] - p[1];
ok &= y[1] == x[1] + p[1] - p[0];
//
return ok;
}
// END_C++
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