FGMPExtra

FGMPExtra

The per-dispatch context handed to a raw callback alongside the arguments.

Declared in Plugins/GMP/Source/GMP/GMP/GMPStruct.h:490

struct FGMPExtra
{
    int32        Size = 0;
    float        DebugSeconds = 0.f;
    const FName* TypeNames = nullptr;
    FSigSource   Source = FSigSource(nullptr);
    FName        Key;
    FGMPKey      Seq = {};
};

Fields

Field	Meaning
Size	number of entries in the FGMPTypedAddr array — the only reliable way to know the argument count
DebugSeconds	timing information for debug tooling
TypeNames	pointer to a static table of type names, one per argument, built once per signature
Source	the FSigSource the message was sent from
Key	the message key
Seq	the request sequence when this dispatch is part of a request/response exchange, otherwise zero

Why TypeNames matters

It is the type-name channel that survives Shipping. The per-argument FGMPTypedAddr::TypeName exists only under GMP_WITH_TYPENAME, so any code that needs types in a packaged build reads TypeNames together with Size instead.

The table is static and shared per signature (built by FMessageBody::MakeStaticNames), so it is cheap to carry — the struct holds a pointer, not a copy.

Lifetime

Valid for the duration of the dispatch only, like the argument array. Do not store the pointer.

See also

FGMPTypedAddr · FMessageBody · FGMPRawSig · Build switches