42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
// Copyright 2015-2018 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_custom_minimal_axis
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#include <boost/histogram.hpp>
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#include <cassert>
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int main() {
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using namespace boost::histogram;
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// stateless axis which returns 1 if the input is even and 0 otherwise
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struct even_odd_axis {
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axis::index_type index(int x) const { return x % 2; }
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axis::index_type size() const { return 2; }
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};
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// threshold axis which returns 1 if the input is above threshold
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struct threshold_axis {
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threshold_axis(double x) : thr(x) {}
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axis::index_type index(double x) const { return x >= thr; }
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axis::index_type size() const { return 2; }
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double thr;
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};
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auto h = make_histogram(even_odd_axis(), threshold_axis(3.0));
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h(0, 2.0);
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h(1, 4.0);
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h(2, 4.0);
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assert(h.at(0, 0) == 1); // even, below threshold
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assert(h.at(0, 1) == 1); // even, above threshold
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assert(h.at(1, 0) == 0); // odd, below threshold
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assert(h.at(1, 1) == 1); // odd, above threshold
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}
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//]
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