UGMPMeta

UGMPMeta

The collected signature table: for each tag, the parameter types it has been used with.

Declared in Plugins/GMP/Source/GMP/Private/GMPMeta.h:80

UCLASS(defaultconfig, config = GMPMeta)
class UGMPMeta : public UObject
{
public:
    GMP_API static const TArray<FName>* GetTagMeta(const UObject* WorldCtx, FName MsgTag);
    GMP_API static const TArray<FName>* GetSvrMeta(const UObject* WorldCtx, FName MsgTag);

    UPROPERTY()        TMap<FName, FGMPTagTypes> GMPTypes;
    UPROPERTY(Config)  TArray<FGMPTagMetaBase>   MessageTagsList;
};

What it holds

GetTagMeta returns the recorded parameter type names for a tag, in order — the array that Parameter compatibility compares against. GetSvrMeta is the server-side counterpart.

Two storages, deliberately:

Property	Config-backed	Role
GMPTypes	no	the live table used during a session
MessageTagsList	yes	what serialises to DefaultGMPMeta.ini

It is a config object

config = GMPMeta with defaultconfig means the collected table writes out to DefaultGMPMeta.ini.

Staging that ini with a build carries the signatures into the packaged game. That is what lets a script backend validate types at runtime without the editor present. If script-side type validation is expected in a shipped build and is not happening, an unstaged ini is the first thing to check.

How it gets filled

Editor-time collection from C++ call sites, Blueprint nodes and script usage, plus Signature inference for tags never declared in C++. Filling and comparison are gated on GMP_WITH_DYNAMIC_CALL_CHECK — on in Editor and Development.

What reads it

• listener registration and dispatch validation
• Blueprint node pin generation — see UK2Neuron
• per-language codegen — see Transparent rewrite

Caveat

The table records what has been observed, not what is declared. A tag exercised only in a code path no editor run ever took has nothing recorded for it, and nothing to validate against.

See also

Signature inference · Parameter compatibility · Class2Name · MSGKEY