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POnon-virtual template based class - leak memory?
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copied!<p>Based on the <a href="http://rads.stackoverflow.com/amzn/click/0321133544" rel="nofollow">book</a>, pp338</p> <pre><code>#include <iostream> #include <vector> #include <string> #include <ostream> #include <algorithm> #include <boost/function.hpp> #include <boost/bind.hpp> #include <boost/cast.hpp> using namespace std; template <typename R, typename Arg> class invoker_base { public: virtual R operator()(Arg arg)=0; }; template <typename R, typename Arg> class function_ptr_invoker : public invoker_base<R,Arg> { R (*func_)(Arg); public: function_ptr_invoker(R (*func)(Arg)):func_(func) {} R operator()(Arg arg) { return (func_)(arg); } }; template <typename R, typename Arg> class function1 { invoker_base<R,Arg>* invoker_; public: function1(R (*func)(Arg)) : invoker_(new function_ptr_invoker<R,Arg>(func)) {} R operator()(Arg arg) { return (*invoker_)(arg); } ~function1() { delete invoker_; } }; bool some_function(const std::string& s) { std::cout << s << " This is really neat\n"; return true; } int main() { function1<bool,const std::string&> f1(&some_function); f1(std::string("Hello")); } </code></pre> <p><strong>Question</strong>> the default destructor of <code>invoker_base</code> is NOT virtual. Does there exist memory leak in the implementation of <code>function1</code>? As the code indicates, the <code>function1::~function1</code> deletes the allocated resource through a non-virtual base class pointer.</p>

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