// Create one function for each expression as a closure, capturing the serial and type for that function
// Create an open or predicate function
public bool CreateFunction(string name, FuncTypes functype, int serial, SqlCommonType[] args, SqlCommonType retn)
{
UserFunctionCallback func = (c, nv, v) => EvalFunctionOpen(c, nv, v, functype, serial, args, retn);
_userfuncs.Add(func);
return(CreateFunction(name, func));
}
private static extern int sqlite3_create_function(IntPtr dbHandle, byte[] functionName, int numArgs, int textEncoding,
IntPtr pApp, UserFunctionCallback xFunc, IntPtr xStep, IntPtr xFinal);
public static extern int sqlite3_create_function_scalar(IntPtr db, string zFunctionName, int nArg, int eTextRep, IntPtr pApp,
UserFunctionCallback xFunc, IntPtr xStep, IntPtr xFinal);
// Wrapper
public bool CreateFunction(string name, UserFunctionCallback callback)
{
_lastresult = (Result)sqlite3_create_function_scalar(_dbhandle, name, -1,
(int)Encoding.UTF8, IntPtr.Zero, callback, IntPtr.Zero, IntPtr.Zero);
return(CheckOk());
}
