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44 lines
994 B
C++
44 lines
994 B
C++
//[ guide_custom_modified_axis
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#include <boost/histogram.hpp>
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#include <sstream>
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#include <cassert>
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namespace bh = boost::histogram;
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// custom axis, which adapts builtin integer axis
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struct custom_axis : public bh::axis::integer<> {
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using value_type = const char*; // type that is fed to the axis
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using integer::integer; // inherit ctors of base
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// the customization point
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// - accept const char* and convert to int
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// - then call index method of base class
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int operator()(value_type s) const { return integer::operator()(std::atoi(s)); }
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};
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int main() {
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auto h = bh::make_histogram(custom_axis(3, 6));
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h("-10");
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h("3");
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h("4");
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h("9");
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std::ostringstream os;
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for (auto xi : h.axis()) {
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os << "bin " << xi.idx()
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<< " [" << xi.lower() << ", " << xi.upper() << ") "
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<< h.at(xi) << "\n";
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}
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std::cout << os.str() << std::endl;
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assert(os.str() ==
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"bin 0 [3, 4) 1\n"
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"bin 1 [4, 5) 1\n"
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"bin 2 [5, 6) 0\n");
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}
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//]
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