conda install -c conda-forge ipyleaflet
A Jupyter kernel for C++ based on the cling C++ interpreter and the xeus native implementation of the Jupyter protocol, xeus.
In [ ]:
#include <iostream>
std::cout << "some output" << std::endl;
In [ ]:
std::cerr << "some error" << std::endl;
In [ ]:
#include <stdexcept>
In [ ]:
throw std::runtime_error("Unknown exception");
In [ ]:
?xt::xtensor
For a user-defined type T, the rich rendering in the notebook and JupyterLab can be enabled by by implementing the function xeus::xjson mime_bundle_repr(const T& im), which returns the JSON mime bundle for that type.
More documentation on the rich display system of Jupyter and Xeus-cling is available at https://xeus-cling.readthedocs.io/en/latest/rich_display.html
In [ ]:
#include <string>
#include <fstream>
#include "xtl/xbase64.hpp"
#include "xeus/xjson.hpp"
namespace im
{
struct image
{
inline image(const std::string& filename)
{
std::ifstream fin(filename, std::ios::binary);
m_buffer << fin.rdbuf();
}
std::stringstream m_buffer;
};
xeus::xjson mime_bundle_repr(const image& i)
{
auto bundle = xeus::xjson::object();
bundle["image/png"] = xtl::base64encode(i.m_buffer.str());
return bundle;
}
}
In [ ]:
im::image marie("src/marie.png");
marie
Magics are special commands for the kernel that are not part of the C++ language.
They are defined with the symbol % for a line magic and %% for a cell magic.
More documentation for magics is available at https://xeus-cling.readthedocs.io/en/latest/magics.html.
In [ ]:
#include <algorithm>
#include <vector>
In [ ]:
std::vector<double> to_shuffle = {1, 2, 3, 4};
In [ ]:
%timeit std::random_shuffle(to_shuffle.begin(), to_shuffle.end());
In [ ]:
#include <iostream>
#include "xtensor/xarray.hpp"
#include "xtensor/xio.hpp"
#include "xtensor/xview.hpp"
In [ ]:
xt::xarray<int> arr
{1, 2, 3, 4, 5, 6, 7, 8, 9};
arr.reshape({3, 3});
arr
In [ ]:
#include <symengine/expression.h>
using SymEngine::Expression;
Rich rendering of mathematical expressions.
In [ ]:
Expression x("x");
auto ex = pow(x + sqrt(Expression(2)), 10);
ex
In [ ]:
expand(ex)
In [ ]:
#include <xtensor/xarray.hpp>
#include <xtensor/xbuilder.hpp>
#include <xtensor/xio.hpp>
#include <xtensor/xview.hpp>
In [ ]:
Expression y("z");
In [ ]:
xt::xarray<int> e = xt::linspace(0.0, 100.0, 6);
In [ ]:
e + y
In [ ]:
#include <xtensor/xreducer.hpp>
In [ ]:
auto s = (e + y) * xt::view(e + y, xt::all(), xt::newaxis());
s
In [ ]:
xt::sum(s)()
In [ ]:
#include <xwidgets/xslider.hpp>
#include <xwidgets/xbutton.hpp>
In [ ]:
xw::slider<double> slider;
slider
In [ ]:
auto button = xw::button_generator()
.description("Click me!")
.finalize();
button