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48 lines
1.5 KiB
C++
48 lines
1.5 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_fill_histogram
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#include <boost/histogram.hpp>
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#include <cassert>
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#include <functional>
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#include <numeric>
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#include <utility>
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#include <vector>
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namespace bh = boost::histogram;
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int main() {
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auto h = bh::make_histogram(bh::axis::regular<>(8, 0.0, 4.0),
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bh::axis::regular<>(10, 0.0, 5.0));
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// fill histogram, number of arguments must be equal to number of axes,
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// types must be convertible to axis value type (here double)
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h(0, 1.1); // increases bin counter by one
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h(bh::weight(2), 3, 3.4); // increase bin counter by 2 instead of 1
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// fills from a tuple are also supported; passing a tuple of wrong size
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// causes an error at compile-time or an assertion at runtime in debug mode
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auto xy = std::make_tuple(4, 3.1);
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h(xy);
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// functional-style processing is also supported, generate some data...
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std::vector<std::tuple<int, double>> input_data;
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input_data.emplace_back(0, 1.2);
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input_data.emplace_back(2, 3.4);
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input_data.emplace_back(4, 5.6);
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// std::for_each takes the functor by value, we use a reference wrapper
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// here to avoid costly copies
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std::for_each(input_data.begin(), input_data.end(), std::ref(h));
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// h is filled
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const double sum = std::accumulate(h.begin(), h.end(), 0.0);
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assert(sum == 7);
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}
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//]
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