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Frank Birbacher
47b3f8b73c
add a readable functor map that calls a given functor or function upon lookup. Ideas from: http://comments.gmane.org/gmane.comp.lib.boost.user/54397 and: http://comments.gmane.org/gmane.comp.lib.boost.user/73358 [SVN r77438]
29 lines
1.0 KiB
ReStructuredText
29 lines
1.0 KiB
ReStructuredText
.. Copyright David Abrahams 2004. Use, modification and distribution is
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.. subject to the Boost Software License, Version 1.0. (See accompanying
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.. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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::
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template <class Dereferenceable>
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struct indirect_reference
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{
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typedef /* see below */ type;
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};
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:Requires: For an object ``x`` of type ``Dereferenceable``, ``*x``
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is well-formed. If ``++x`` is ill-formed it shall neither be
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ambiguous nor shall it violate access control, and
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``pointee<Dereferenceable>::type&`` shall be well-formed.
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Otherwise ``iterator_traits<Dereferenceable>::reference`` shall
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be well formed. [Note: These requirements need not apply to
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explicit or partial specializations of ``indirect_reference``]
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``type`` is determined according to the following algorithm, where
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``x`` is an object of type ``Dereferenceable``::
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if ( ++x is ill-formed )
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return ``pointee<Dereferenceable>::type&``
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else
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std::iterator_traits<Dereferenceable>::reference
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