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40 lines
1.4 KiB
C++
40 lines
1.4 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_storage
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#include <array>
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#include <boost/histogram.hpp>
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#include <unordered_map>
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#include <vector>
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namespace bh = boost::histogram;
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int main() {
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// create static histogram with vector<int> as counter storage,
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// you can use other arithmetic types as counters, e.g. double
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auto h1 =
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bh::make_histogram_with(std::vector<int>(), bh::axis::regular<>(10, 0.0, 1.0));
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// create static histogram with array<int, N> as counter storage
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// which is allocated completely on the stack (this is very fast)
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auto h2 =
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bh::make_histogram_with(std::array<int, 12>(), bh::axis::regular<>(10, 0.0, 1.0));
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// N may be larger than the actual number of bins used; an exception
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// is raised if N is too small to hold all bins
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// create static histogram with unordered_map as counter storage;
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// this generates a sparse histogram where only memory is allocated
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// for bins that are non-zero
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auto h3 = bh::make_histogram_with(std::unordered_map<std::size_t, int>(),
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bh::axis::regular<>(10, 0.0, 1.0));
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// this sounds like a good idea for high-dimensional histograms,
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// but maps come with a signficant memory and run-time overhead; the
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// default_storage usually performs better in high dimensions
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}
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//]
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