 The cv-qualifier may be 'const',
      'volatile', or 'const volatile'.
    </p>
<p>
      The metafunction returns a single type called 'type', which is a boost::mpl::bool_.
      As a convenience the metafunction returns the value of this type directly as
      a compile time bool constant called 'value'. This 'value' is true or false
      depending on whether the inner member function, of the specified signature,
      exists or not.
    </p>
<h4>
<a name="the_type_traits_introspection_library.tti_deta