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ROBLOX2016
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Library/boost/libs/histogram/examples/guide_custom_accumulators_simple.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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// Copyright 2018 Hans Dembinski // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt // or copy at http://www.boost.org/LICENSE_1_0.txt) //[ guide_custom_accumulators_simple #include <boost/format.hpp> #include <boost/histogram.hpp> #include <cassert> #include <iostream> #include <sstream> int main() { using namespace boost::histogram; // A custom accumulator which tracks the maximum of the samples. // It must have a call operator that accepts the argument of the `sample` function. struct maximum { // return value is ignored, so we use void void operator()(double x) { if (x > value) value = x; } double value = 0; // value is public and initialized to zero }; // Create 1D histogram that uses the custom accumulator. auto h = make_histogram_with(dense_storage<maximum>(), axis::integer<>(0, 2)); h(0, sample(1.0)); // sample goes to first cell h(0, sample(2.0)); // sample goes to first cell h(1, sample(3.0)); // sample goes to second cell h(1, sample(4.0)); // sample goes to second cell std::ostringstream os; for (auto&& x : indexed(h)) { os << boost::format("index %i maximum %.1f\n") % x.index() % x->value; } std::cout << os.str() << std::flush; assert(os.str() == "index 0 maximum 2.0\n" "index 1 maximum 4.0\n"); } //]