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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/local/val_graph/tape.hpp>
/*
{xrst_begin val_fold_con_xam.cpp dev}
Value Tape Re-Numbering Example
###############################
{xrst_literal
// BEGIN_C++
// END_C++
}
{xrst_end val_fold_con_xam.cpp}
*/
// BEGIN_C++
bool fold_con_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;
//
// tape
tape_t<double> tape;
addr_t n_ind = 1;
addr_t index_of_nan = tape.set_ind(n_ind);
ok &= index_of_nan == n_ind;
//
// c_0, c_1
Vector<double> c(2);
c[0] = 1.0;
c[1] = 2.0;
addr_t c_0 = tape.record_con_op( c[0] );
addr_t c_1 = tape.record_con_op( c[1] );
//
// tape, c_2
Vector<addr_t> op_arg(2);
op_arg[0] = c_0;
op_arg[1] = c_1;
addr_t c_2 = tape.record_op(add_op_enum, op_arg); // c[2] = c[0] + c[1]
//
// dep_vec
Vector<addr_t> dep_vec(1);
//
// tape
op_arg[0] = 0;
op_arg[1] = c_2;
dep_vec[0] = tape.record_op(add_op_enum, op_arg); // y[0] = x[0] + c[2]
//
// set_dep
tape.set_dep( dep_vec );
//
// trace
bool trace = false;
//
// x
Vector<double> x(1);
x[0] = 5.0;
//
// val_vec
Vector<double> val_vec( tape.n_val() );
for(addr_t i = 0; i < n_ind; ++i)
val_vec[i] = x[i];
tape.eval(trace, val_vec);
//
// y, ok
Vector<double> y(1);
dep_vec = tape.dep_vec();
y[0] = val_vec[ dep_vec[0] ];
ok &= y[0] == x[0] + c[0] + c[1];
ok &= tape.con_vec().size() == 3;
ok &= tape.n_op() == 5;
//
// fold_con
tape.fold_con();
ok &= tape.con_vec().size() == 4;
//
// val_vec
val_vec.resize( tape.n_val() );
tape.eval(trace, val_vec);
//
// dead_code
tape.dead_code();
ok &= tape.con_vec().size() == 2;
//
// val_vec
val_vec.resize( tape.n_val() );
for(addr_t i = 0; i < n_ind; ++i)
val_vec[i] = x[i];
tape.eval(trace, val_vec);
//
// y, ok
dep_vec = tape.dep_vec();
y[0] = val_vec[ dep_vec[0] ];
ok &= y[0] == x[0] + c[0] + c[1];
//
return ok;
}
// END_C++
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