ceph/src/boost/libs/core/doc/addressof.qbk

   1 [/
   2   Copyright 2014 Peter Dimov
   3
   4   Distributed under the Boost Software License, Version 1.0.
   5
   6   See accompanying file LICENSE_1_0.txt
   7   or copy at http://boost.org/LICENSE_1_0.txt
   8 ]
   9
  10 [section:addressof addressof]
  11
  12 [simplesect Authors]
  13
  14 * Brad King
  15 * Douglas Gregor
  16 * Peter Dimov
  17
  18 [endsimplesect]
  19
  20 [section Header <boost/core/addressof.hpp>]
  21
  22 The header `<boost/core/addressof.hpp>` defines the function
  23 template `boost::addressof`. `boost::addressof(x)` returns the
  24 address of `x`. Ordinarily, this address can be obtained by
  25 `&x`, but the unary `&` operator can be overloaded. `boost::addressof`
  26 avoids calling used-defined `operator&()`.
  27
  28 `boost::addressof` was originally contributed by Brad King
  29 based on ideas from discussion with Doug Gregor.
  30
  31 [section Synopsis]
  32
  33 ``
  34 namespace boost
  35 {
  36     template<class T> T* addressof( T& x );
  37 }
  38 ``
  39
  40 [endsect]
  41
  42 [section Example]
  43
  44 ``
  45 #include <boost/core/addressof.hpp>
  46
  47 struct useless_type { };
  48
  49 class nonaddressable {
  50     useless_type operator&() const;
  51 };
  52
  53 void f() {
  54     nonaddressable x;
  55     nonaddressable* xp = boost::addressof(x);
  56     // nonaddressable* xpe = &x; /* error */
  57 }
  58 ``
  59
  60 [endsect]
  61
  62 [endsect]
  63
  64 [endsect]