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POcopy constructor not called
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  1. POcopy constructor not called
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    copied!<pre><code>#include &lt;iostream&gt; int main(void) { class date { private: int day; int month; int year; public: date( ) { std::cout &lt;&lt; "default constructor called" &lt;&lt; std::endl; } date&amp; operator=(const date&amp; a) { std::cout &lt;&lt; "copy constructor called" &lt;&lt; std::endl; day=a.day; month=a.month; year=a.year; } date(int d ,int m ,int y ) : day(d),month(m),year(y){ std::cout &lt;&lt; "constructor called" &lt;&lt; std::endl; } void p_date(){ std::cout &lt;&lt; "day=" &lt;&lt; day &lt;&lt; ",month=" &lt;&lt; month &lt;&lt; ",year=" &lt;&lt; year &lt;&lt; std::endl; } date&amp; add_day(int d) { day += d; return *this;} date&amp; add_month(int d) { month += d;return *this; } date&amp; add_year(int d) { year += d;return *this; } }; class cdate { date n; public: cdate(date b) : n(b) { std::cout &lt;&lt; "cdate constructor called" &lt;&lt; std::endl;} void p_cdate() { n.p_date(); } }; cdate ncdate(date(30,1,2012)); ncdate.p_cdate(); } </code></pre> <p>When we instantiate <code>ncdate</code> in this code:</p> <ol> <li>temporary date object created when we call <code>cdate ncdate(date(30,1,2012));</code></li> <li>then i expect the call <code>n = b</code> and expect <code>n</code>'s copy constructor to be called. </li> </ol> <p><code>n</code>'s copy constructor is not getting called and i cant figure out why. I know there is something wrong in the 2nd assumption. <strong>Note:</strong> this is test code only so don't go over its performance, usability etc.</p>
 

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