mrdocs::describe::undefined_enumerator

The enumerator of E that stands for the undefined (empty) state.

Synopsis

Declared in <mrdocs/Support/Reflection/Describe.hpp>

template<class E>
requires has_undefined_enumerator<E>
inline constexpr E undefined_enumerator = mrdocs_undefined_descriptor_fn(static_cast<E**>(nullptr));

Description

Valid only when has_undefined_enumerator<E>. toString renders this value as the empty string, and generators treat a field holding it as absent (an empty optional). Declared with MRDOCS_DESCRIBE_ENUM_UNDEFINED.

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