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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 nan.cpp}
nan: Example and Test
#####################
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end nan.cpp}
*/
// BEGIN C++
# include <cppad/utility/nan.hpp>
# include <vector>
# include <limits>
bool nan(void)
{ bool ok = true;
// get a nan
double double_zero = 0.;
double double_nan = std::numeric_limits<double>::quiet_NaN();
// create a simple vector with no nans
std::vector<double> v(2);
v[0] = double_zero;
v[1] = double_zero;
// check that zero is not nan
ok &= ! CppAD::isnan(double_zero);
ok &= ! CppAD::hasnan(v);
// check that nan is a nan
v[1] = double_nan;
ok &= CppAD::isnan(double_nan);
ok &= CppAD::hasnan(v);
// check that nan is not equal to itself
ok &= (double_nan != double_nan);
return ok;
}
// END C++
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