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30 lines
675 B
C++
30 lines
675 B
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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namespace bh = boost::histogram;
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// stateless axis which returns 1 if the input is even and 0 otherwise
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struct minimal_axis {
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int operator()(int x) const { return x % 2; }
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unsigned size() const { return 2; }
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};
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int main() {
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auto h = bh::make_histogram(minimal_axis());
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h(0); h(1); h(2);
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assert(h.at(0) == 2); // two even numbers
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assert(h.at(1) == 1); // one uneven number
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}
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//]
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