[kadet.89]

Here is my solution:

PHP Code:

#define EXTRACT_VOID_FUNCTIONPTR(x)        (*(void **)(&(x)))

void *UTIL_FunctionFromName( datamap_t *pMap, const char *pName )
{
    while ( pMap )
    {
        for ( int i = 0; i < pMap->dataNumFields; i++ )
        {
            Assert( sizeof(pMap->dataDesc[i].inputFunc) == sizeof(void *) );

            if ( pMap->dataDesc[i].flags & FTYPEDESC_FUNCTIONTABLE )
            {
                if ( FStrEq( pName, pMap->dataDesc[i].fieldName ) )
                {
                    return EXTRACT_VOID_FUNCTIONPTR(pMap->dataDesc[i].inputFunc);
                }
            }
        }
        pMap = pMap->baseMap;
    }

    Msg( "Failed to find function %s\n", pName );

    return NULL;
}

typedef void (CBaseEntity::*VALVE_BASEPTR)(void);
typedef void (CBaseEntity::*VALVE_ENTITYFUNCPTR)(CBaseEntity *pOther);

VALVE_BASEPTR CBaseGrenade::func_Detonate = nullptr;
VALVE_ENTITYFUNCPTR CBaseGrenade::func_ExplodeTouch = nullptr;

void CBaseGrenade::detonate()
{
    if(func_Detonate != nullptr)
        return;

    void *ptr = UTIL_FunctionFromName( GetDataDescMap_Real(), "CBaseGrenadeDetonate");
    if(!ptr)
        return;

    memcpy(&func_Detonate, &ptr, sizeof(void *));
    (getBaseEntity()->*func_Detonate)(); //getBaseEntity() returns CBaseEntity*
} 


For GetDataDescMap_Real use standard offset from core.games "GetDataDescMap"
It seams to be the only way to detonate grenades without delays and dealing with signatures.