

<p>Function objects are passed by reference to const; function
pointers are passed by value.</p>


<h3>Limitations</h3>

<p>This library uses these traits within all function object adapters,
theoretically rendering <tt><nobr>ptr_fun</nobr></tt> obsolete.
However, third party adapters probably won't take advantage of this
mechanism, and so <tt><nobr>ptr_fun</nobr></tt> may still be required.
Accordingly, this library also provides <a
href="ptr_fun.html">improved versions of the standard function pointer
a