stack_direction2

#include <iostream>
#include <boost/context/all.hpp>

bool is_upward()
{
    struct C
    {
        boost::context::fcontext_t master;
        char stack1[512], stack2[512];
    } c;
    auto slave = boost::context::make_fcontext(c.stack2, 512, [](boost::intptr_t p)
    {
        auto c = reinterpret_cast<C*>(p);
        char s[32];
        boost::context::jump_fcontext(&c->master, c->master, c->stack2 < s);
    });
    return boost::context::jump_fcontext(&c.master, slave, reinterpret_cast<boost::intptr_t>(&c));
}

int main(int argc, char** argv) {
    std::cout << is_upward();
	return 0;
}