c++ passing by const reference -

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in following program body cosists of vector of pointers. points struct of x,y,z coordinates , point_id. believe body passed const reference, following step should produce error. program running without problem. can please explain me why this. 

void readoutfile(const body& body, int n){      ....      body.bp[0]->points.push_back(point_id(p,i)); }

here's issue:

body.bp[0]->points.push_back(point_id(p,i));           ^^

indirecting through pointer removes constness; rather, constness of result dependent on type of pointer.

t *t;              // pointer t: can modify t , (*t) const t *t;        // pointer const-t: can modify t not (*t) t *const t;        // const-pointer t: can modify (*t) not t const t *const t;  // const-pointer const-t: can't modify either t or (*t)

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