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_make_dynamic_histogram
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#include <boost/histogram.hpp>
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#include <cassert>
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#include <sstream>
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#include <vector>
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const char* config = "4 1.0 2.0\n"
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"5 3.0 4.0\n";
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int main() {
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using namespace boost::histogram;
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// read axis config from a config file (mocked here with std::istringstream)
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// and create vector of regular axes, the number of axis is not known at compile-time
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std::istringstream is(config);
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auto v1 = std::vector<axis::regular<>>();
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while (is.good()) {
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unsigned bins;
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double start, stop;
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is >> bins >> start >> stop;
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v1.emplace_back(bins, start, stop);
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}
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// create histogram from iterator range
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// (copying or moving the vector also works, move is shown below)
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auto h1 = make_histogram(v1.begin(), v1.end());
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assert(h1.rank() == v1.size());
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// with a vector of axis::variant (polymorphic axis type that can hold any one of the
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// template arguments at a time) the types and number of axis can vary at run-time
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auto v2 = std::vector<axis::variant<axis::regular<>, axis::integer<>>>();
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v2.emplace_back(axis::regular<>(100, -1.0, 1.0));
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v2.emplace_back(axis::integer<>(1, 7));
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// create dynamic histogram by moving the vector
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auto h2 = make_histogram(std::move(v2));
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assert(h2.rank() == 2);
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}
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//]
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