How can I create entities more than 1048575?

[sawino]

I'm trying to create 100,000,000 entities but the creation failed when calls registry.create() for more than 1,048,575 times.
`
entt::registry r;

// 100,000,000 entities
for (size_t i = 0ul; i < 100000000ul; i++) {
    // failed when i is greater than 1048575
    auto entity = r.create();
}

`

The assertion failure happened at entt::basic_storage::entity_at().

`
auto entity_at(const std::size_t pos) const noexcept {
// exception happens here
ENTT_ASSERT(pos < underlying_type::traits_type::to_entity(null), "Invalid element");
return underlying_type::traits_type::combine(static_cast(pos), {});
}

`
I tried to debug and read the documents, but I cannot find a solution. How can I achieve my goal? Do I miss any configurations?
Any comments will be appreciated.

[Daedie-git]

By default, entt represents entities using 32 bit. 20 bit for the id (max value: 1048575) and 12 bit for the version/generation. This can be customized to suit your needs.

[sawino]

Thanks for your message which helped me to understand the magic number, and explained how does it work.

[skypjack]

https://github.com/skypjack/entt/wiki/Frequently-Asked-Questions#custom-entity-identifiers-yay-or-nay

[sawino]

Thanks for the reply. I have resolved my issue by changing the ENTT_ID_TYPE from uint32_t to uint64_t in the entt/config/config.h.

Code

`
#ifndef ENTT_ID_TYPE
# include <cstdint>
# define ENTT_ID_TYPE std::uint64_t
#endif

`