
    template &lt;function_pointer Fptr&gt;
    struct dummy_struct { };
  public:
    typedef dummy_struct&lt; BOOST_FPTR Concept::constraints &gt; check;
  };
</pre>

<tt>class_requires</tt> was not used in the implementation of the
Boost Concept Checking Library concept checks because several
compilers do not implement template parameters of function pointer
type.

-->

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