GioTest.cpp

// Result:
// signal does not depends on main loop
// GSimpleAction is a very useful tool for DocView model

#include <gio/gio.h>

namespace {
bool c1 = false;
bool c2 = false;
void callback1() {
  c1 = true;
}
void callback2() {
  c2 = true;
}
}

int main() {
  auto a = g_simple_action_new("a", nullptr);
  g_signal_connect(a, "activate", callback1, nullptr);
  g_signal_connect(a, "activate", callback2, nullptr);
  g_action_activate(G_ACTION(a), nullptr);
  g_assert(c1);
  g_assert(c2);
}

// compile command:
// g++ -std=c++11 `pkg-config --cflags --libs gio-2.0` GioTest.cpp