version_slot.hpp File Reference

The conditional-base mechanism that gives a versioned chunked entity exactly the fields its client version defines. More...

#include <type_traits>
#include <wowlib/core/client_version.hpp>

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Classes
struct	wowlib::formats::Absent< Trait >
	A distinct empty base per Trait, so an entity inheriting several inactive version slots never inherits the same empty type twice (ill-formed). More...

Namespaces
namespace	wowlib
namespace	wowlib::formats

Typedefs
template<ClientVersion V, ClientVersion Since, class Trait, ClientVersion Until = VersionNeverRemoved>
using	wowlib::formats::Slot = std::conditional_t<(V.formatLineage() >= Since && V.formatLineage() < Until), Trait, Absent<Trait>>
	A version-gated base: the entity inherits Trait (flattening its chunk members in) iff Since <= V < Until, else the empty absent<Trait>.

Variables
constexpr ClientVersion	wowlib::formats::VersionNeverRemoved {255, 0, 0, 0}
	Above any supported client build — the default Until (never removed).

Detailed Description

The conditional-base mechanism that gives a versioned chunked entity exactly the fields its client version defines.

Version-gated chunks are grouped by availability range into small unwelded trait structs; the entity inherits each trait through Slot<V, Since, Trait[, Until]> — the trait when Since <= V < Until, else a distinct empty absent<Trait>. welder flattens an active trait's members onto the entity's binding (annotations survive, read off the declaring class); an inactive trait contributes nothing, so the field simply does not exist for that version (setting it is a compile error).

Definition in file version_slot.hpp.