synopsis: OP s_v_l(OP vectorobject)


selects the length of an VECTOR object. There is first a check whether it is really an VECTOR object. There is also a check whether the length is a not negative number.


s_v_l gives the length part of the VECTOR object, this is an INTEGER object, it is not a copy of the length part. s_v_li gives the INTvalue of the length part. It is equivalent to s_i_i(s_v_l()). If an error occured s_v_l returns NULL and s_v_li() returns ERROR.


there are macro versions which do no checks, they are called S_V_L and S_V_LI

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