(types 3)
PostgreSQL
Object Relational DataBase Management System

型の拡張(3)
出力関数
complex_out
char *complex_out(Complex *complex)
{
    char *result;
    if (complex == NULL)
        return(NULL);
    result = (char *) palloc(60);
    sprintf(result, "(%g,%g)", complex->x, complex->y);
    return(result);
}