graphicviz-dot example

viz.cpp

#include <cstdio>
#include <fstream>

#define VISUAL(caller, callee, ofs)                 \
    ofs << caller << "->"; \
    callee(ofs);              \
    ofs << ';' << '\n'

void foo(std::ofstream &ofs)
{
    printf("%s\n", __func__);
    ofs << __func__;
}

void bar(std::ofstream &ofs)
{
    printf("%s\n", __func__);
    ofs << __func__;
}

int main()
{
    std::ofstream ofs("viz.dot");

    printf("%s\n", __func__);

    ofs << "digraph" << '{' << '\n';

    VISUAL(__func__, foo, ofs);
    VISUAL(__func__, bar, ofs);

    ofs << '}' << '\n';
    ofs.close();

    return 0;
}

/* to generate png, execute: */
/* dot -Tpng viz.dot -o viz.png */