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    <p>You cannot pass a member function pointer as a function pointer, because the latter lacks the context pointer (the <code>this</code>) to properly invoke the member function pointer.</p> <p>The general way to solve this (as in the standard C++ library) is to use a template:</p> <pre><code>template &lt;typename F&gt; double OneDimBisector(F fun, float a, float b, float tol){ double val; val = fun(0.5*(b-a)); return val; } </code></pre> <p>and pass a function object to it</p> <pre><code>struct Evaluator { EOS* this_; Evaluator(EOS* this_) : this_(this_) {} // constructor double operator()(double value) const // call the function { return this_-&gt;functForT_PS(value); } }; T1 = OneDimBisector(Evaluator(this), Tmin, Tmax, tol); </code></pre> <p>You could also use <code>std::bind1st(std::mem_fun(&amp;EOS::functForT_PS), this)</code>, but what it does is just the same as the structure above. <sub><sup>(BTW, both std::bind1st and std::mem_fun have been deprecated.)</sup></sub></p> <p>If you don't like templates, you could accept a polymorphic function instead (e.g. using <a href="http://www.boost.org/doc/libs/1_48_0/doc/html/function.html" rel="nofollow">Boost.Function</a> or std::function in C++11), but it will be slower:</p> <pre><code>double OneDimBisector(const boost::function&lt;double(double)&gt;&amp; fun, float a, float b, float tol) { return fun(0.5 * (b-a)); } </code></pre> <p>and finally, if you can use C++11, you could use a lambda function on calling OneDimBisector:</p> <pre><code>T1 = OneDimBisector([=](double value){ return functForT_PS(value); }, Tmin, Tmax, tol); </code></pre>
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    1. COCouldn't you `boost::bind` `this` to the member function as an additional alternative that doesn't require writing a functor or C++11?
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      1. USMark B
    2. CO@MarkB: Yes, and others have answered that already.
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    3. CO@KennyTM Thanks for your detailed and helpful answer! I like the template solution and it works well for me.
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