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Support const ecs::accessor and const-qualified component types in ecs::accessor::get

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This commit is contained in:
Nikita Lisitsa 2023-12-16 20:06:40 +03:00
parent 6833531edb
commit 6a13a06187
1 changed files with 23 additions and 3 deletions
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26
libs/ecs/include/psemek/ecs/accessor.hpp
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@ -62,6 +62,9 @@ namespace psemek::ecs
template <typename Component>
Component * get_if();
template <typename Component>
Component const * get_if() const;
/** Obtain the component of the specified type of the accessed entity.
*
* @tparam Component The type of component to obtain
@ -73,6 +76,9 @@ namespace psemek::ecs
template <typename Component>
Component & get();
template <typename Component>
Component const & get() const;
/** Check if the entity contains this component type.
*
* @tparam Component The type of component to obtain
@ -100,7 +106,13 @@ namespace psemek::ecs
template <typename Component>
Component * accessor::get_if()
{
util::uuid const uuid = Component::uuid();
return const_cast<Component *>(static_cast<accessor const *>(this)->get_if<Component>());
}
template <typename Component>
Component const * accessor::get_if() const
{
util::uuid const uuid = std::remove_const_t<Component>::uuid();
auto column = table_->column(uuid);
if (!column)
@ -114,13 +126,21 @@ namespace psemek::ecs
{
if (auto ptr = get_if<Component>())
return *ptr;
throw component_not_found_exception(typeid(Component), table_->entity_handles()[row_]);
throw component_not_found_exception(typeid(std::remove_const_t<Component>), table_->entity_handles()[row_]);
}
template <typename Component>
Component const & accessor::get() const
{
if (auto ptr = get_if<Component const>())
return *ptr;
throw component_not_found_exception(typeid(std::remove_const_t<Component>), table_->entity_handles()[row_]);
}
template <typename Component>
bool accessor::contains() const
{
return get_if<Component>() != nullptr;
return get_if<Component const>() != nullptr;
}
inline accessor::accessor(detail::table * table, std::uint32_t row)