using namespace boost::histogram;

std::ostringstream os;

// width of histogram can be set like this; if it is not set, the library attempts to

// determine the terminal width and choses the histogram width accordingly

os.width(78);

auto h1 = make_histogram(axis::regular<>(5, -1.0, 1.0, "axis 1"));

h1.at(0) = 2;

h1.at(1) = 4;

h1.at(2) = 3;

h1.at(4) = 1;

// 1D histograms are rendered as an ASCII drawing

os << h1;

auto h2 = make_histogram(axis::regular<>(2, -1.0, 1.0, "axis 1"),

axis::category<std::string>({"red", "blue"}, "axis 2"));

// higher dimensional histograms just have their cell counts listed

os << h2;

std::cout << os.str() << std::endl;

assert(

os.str() ==

"histogram(regular(5, -1, 1, metadata=\"axis 1\", options=underflow | overflow))\n"

" ┌─────────────────────────────────────────────────────────────┐\n"

"[-inf, -1) 0 │ │\n"

"[ -1, -0.6) 2 │██████████████████████████████ │\n"

"[-0.6, -0.2) 4 │████████████████████████████████████████████████████████████ │\n"

"[-0.2, 0.2) 3 │█████████████████████████████████████████████ │\n"

"[ 0.2, 0.6) 0 │ │\n"

"[ 0.6, 1) 1 │███████████████ │\n"

"[ 1, inf) 0 │ │\n"

" └─────────────────────────────────────────────────────────────┘\n"

"histogram(\n"

" regular(2, -1, 1, metadata=\"axis 1\", options=underflow | overflow)\n"

" category(\"red\", \"blue\", metadata=\"axis 2\", options=overflow)\n"

" (-1 0): 0 ( 0 0): 0 ( 1 0): 0 ( 2 0): 0 (-1 1): 0 ( 0 1): 0\n"

" ( 1 1): 0 ( 2 1): 0 (-1 2): 0 ( 0 2): 0 ( 1 2): 0 ( 2 2): 0\n"

")");