#include <vexcl/vexcl.hpp>

const vex::Context& ctx() {
    // This is a local static variable, so it will only be created and
    // initializaed once.
    // Moving it into a function makes sure it will only be created when needed
    // (at the first call to the function).
    static vex::Context ctx(vex::Filter::Env);
    return ctx;
}

int main() {
    vex::vector<int> x(ctx(), 16);
    x = 42;
    std::cout << x << std::endl;
}