BlackMATov/ecs.hpp
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hash_combine for entity and const_entity std::hash specializations

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This commit is contained in:
Matvey Cherevko
2018-12-30 12:04:53 +07:00
parent 779604b7e0
commit 7624eceff0
1 changed files with 14 additions and 2 deletions
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16
ecs.hpp
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@@ -74,6 +74,14 @@ namespace ecs_hpp
return t;
}
//
// hash_combine
//
constexpr std::size_t hash_combine(std::size_t l, std::size_t r) noexcept {
return l ^ (r + 0x9e3779b9 + (l << 6) + (l >> 2));
}
//
// tuple_tail
//
@@ -695,7 +703,9 @@ namespace std
: std::unary_function<const ecs_hpp::entity&, std::size_t>
{
std::size_t operator()(const ecs_hpp::entity& ent) const noexcept {
return std::hash<ecs_hpp::entity_id>()(ent.id());
return ecs_hpp::detail::hash_combine(
std::hash<const ecs_hpp::registry*>()(&ent.owner()),
std::hash<ecs_hpp::entity_id>()(ent.id()));
}
};
}
@@ -750,7 +760,9 @@ namespace std
: std::unary_function<const ecs_hpp::const_entity&, std::size_t>
{
std::size_t operator()(const ecs_hpp::const_entity& ent) const noexcept {
return std::hash<ecs_hpp::entity_id>()(ent.id());
return ecs_hpp::detail::hash_combine(
std::hash<const ecs_hpp::registry*>()(&ent.owner()),
std::hash<ecs_hpp::entity_id>()(ent.id()));
}
};
}