Open
Description
Hello there! I found a strange behavior. Let's consider the following example:
struct CompA {};
struct CompB {};
struct CompC {};
struct System0
{
using View = entt::view<entt::get_t<const CompA>>;
void tick(View view) {}
};
struct System1
{
using View = entt::view<entt::get_t<const CompB>>;
void tick(View view) {}
};
struct System2
{
using View = entt::view<entt::get_t<const CompC>>;
void tick(View view) {}
};
int main(int argc, char* argv[])
{
System0 sys0;
System1 sys1;
System2 sys2;
entt::organizer organizer;
organizer.emplace<&System0::tick>(sys0, "sys0");
organizer.emplace<&System1::tick>(sys1, "sys1");
organizer.emplace<&System2::tick>(sys2, "sys2");
auto graph = organizer.graph();
for (auto&& node : graph)
{
auto tl = node.top_level(); //-- all nodes are top level and haven't got "in" edges.
}
return 0;
}Now, let's add const entt::registry& to the methods, like this:
struct CompA {};
struct CompB {};
struct CompC {};
struct System0
{
using View = entt::view<entt::get_t<const CompA>>;
void tick(const entt::registry& reg, View view) {}
};
struct System1
{
using View = entt::view<entt::get_t<const CompB>>;
void tick(const entt::registry& reg, View view) {}
};
struct System2
{
using View = entt::view<entt::get_t<const CompC>>;
void tick(const entt::registry& reg, View view) {}
};
int main(int argc, char* argv[])
{
System0 sys0;
System1 sys1;
System2 sys2;
entt::organizer organizer;
organizer.emplace<&System0::tick>(sys0, "sys0");
organizer.emplace<&System1::tick>(sys1, "sys1");
organizer.emplace<&System2::tick>(sys2, "sys2");
auto graph = organizer.graph();
for (auto&& node : graph)
{
auto tl = node.top_level(); //-- now, only the sys0 is top level, but sys1 and sys2 aren't + they have got an input edge.
}
return 0;
}