44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
// Copyright 2019 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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//[ guide_axis_circular
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#include <boost/histogram/axis.hpp>
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#include <limits>
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int main() {
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using namespace boost::histogram;
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// make a circular regular axis ... [0, 180), [180, 360), [0, 180) ....
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using opts = decltype(axis::option::overflow | axis::option::circular);
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auto r = axis::regular<double, use_default, use_default, opts>{2, 0., 360.};
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assert(r.index(-180) == 1);
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assert(r.index(0) == 0);
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assert(r.index(180) == 1);
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assert(r.index(360) == 0);
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assert(r.index(540) == 1);
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assert(r.index(720) == 0);
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// special values are mapped to the overflow bin index
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assert(r.index(std::numeric_limits<double>::infinity()) == 2);
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assert(r.index(-std::numeric_limits<double>::infinity()) == 2);
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assert(r.index(std::numeric_limits<double>::quiet_NaN()) == 2);
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// since the regular axis is the most common circular axis, there exists an alias
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auto c = axis::circular<>{2, 0., 360.};
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assert(r == c);
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// make a circular integer axis
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auto i = axis::integer<int, use_default, axis::option::circular_t>{1, 4};
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assert(i.index(0) == 2);
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assert(i.index(1) == 0);
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assert(i.index(2) == 1);
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assert(i.index(3) == 2);
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assert(i.index(4) == 0);
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assert(i.index(5) == 1);
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}
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//]
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