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POC++ Tracking primitive type value change
 

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    <p>i have a complex program with weird bug that some int value is down to zero unexpectedly.</p> <p>so i want tracking this built-in type value, then i could debug easily.</p> <p>to do that, i made following ValueWatcher template class so i could track almost changes of value except when ValueWatcher is dereferencing. (i made these dereferencing operators because the program needs int *, &amp;)</p> <pre><code>template &lt;typename T&gt; class ValueWatcher { public: ValueWatcher(const T &amp;val) { cout &lt;&lt; "constructor with raw value " &lt;&lt; val &lt;&lt; endl; _cur = _old = val; } ValueWatcher(const ValueWatcher&amp; vw) { cout &lt;&lt; "constructor with ValueWatcher " &lt;&lt; vw._cur &lt;&lt; endl; _cur = vw._cur; } ValueWatcher&amp; operator=(const ValueWatcher &amp;rhs) { cout &lt;&lt; "operator= with ValueWatcher " &lt;&lt; rhs._cur &lt;&lt; endl; _cur = rhs._cur; onChanged(); return *this; } ValueWatcher&amp; operator=(const T &amp;val) { cout &lt;&lt; "operator= with " &lt;&lt; val &lt;&lt; endl; _cur = val; onChanged(); return *this; } int *operator&amp;() { cout &lt;&lt; "addressing operator" &lt;&lt; endl; // can't track anymore!!!!!!!!!!!!!!!!!!!!!!!!! return &amp;_cur; } operator int&amp;() { cout &lt;&lt; "operator int&amp;" &lt;&lt; endl; // can't track anymore!!!!!!!!!!!!!!!!!!!!!!!!! return _cur; } operator int&amp;() const { cout &lt;&lt; "const operator int&amp;" &lt;&lt; endl; return _cur; } operator int() const { cout &lt;&lt; "operator int" &lt;&lt; endl; return _cur; } private: void onChanged() { // update old and do proper action } T _cur; T _old; }; </code></pre> <p>the problem is, when client code wants int &amp; or int * of ValueWatcher, - it can gives int &amp; or int * anyway but - int * or &amp; cannot hold ValueWatcher instance, so can't tracking anymore.</p> <p>is there anyway to solve this? i think it can be solved by returning reference or pointer class instance instead of just returning &amp; or * of built-int type. but i don't know how to do that.</p> <p>in addition- i can't run this program with debugger. the problem occurs only in REAL environment and very hard to reproduce.</p>
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    1. COMaybe a debugger with conditional breakpoint will be a better solution?
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