epoc32/include/stdapis/boost/ptr_container/detail/default_deleter.hpp
author William Roberts <williamr@symbian.org>
Tue, 16 Mar 2010 16:12:26 +0000
branchSymbian2
changeset 2 2fe1408b6811
permissions -rw-r--r--
Final list of Symbian^2 public API header files
     1 // (C) Copyright Jonathan Turkanis 2004-2005.
     2 // Distributed under the Boost Software License, Version 1.0. (See accompanying
     3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
     4 
     5 // Contains the definition of move_ptrs::default_deleter, the default
     6 // Deleter template argument to move_ptr. Uses a technique of Daniel
     7 // Wallin to capture the type of a pointer at the time the deleter 
     8 // is constructed, so that move_ptrs can delete objects of incomplete 
     9 // type by default.
    10 
    11 #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
    12 #define BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED 
    13 
    14 #include <boost/checked_delete.hpp>
    15 #include <boost/mpl/if.hpp>
    16 #include <boost/type_traits/is_array.hpp>
    17 #include <boost/type_traits/remove_bounds.hpp>
    18 
    19 namespace boost { namespace ptr_container_detail { namespace move_ptrs {
    20 
    21 namespace ptr_container_detail {
    22 
    23 template<typename T>
    24 struct deleter_base {
    25     typedef void (*deleter)(T*);
    26     deleter_base(deleter d) { delete_ = d; }
    27     void operator() (T* t) const { delete_(t); }
    28     static deleter delete_;
    29 };
    30 
    31 template<class T>
    32 typename deleter_base<T>::deleter 
    33 deleter_base<T>::delete_;
    34 
    35 template<typename T>
    36 struct scalar_deleter : deleter_base<T> {
    37     typedef deleter_base<T> base;
    38     scalar_deleter() : base(do_delete) { }
    39     static void do_delete(T* t) { checked_delete(t); }
    40 };
    41 
    42 template<typename T>
    43 struct array_deleter 
    44     : deleter_base<typename remove_bounds<T>::type>
    45 {
    46     typedef typename remove_bounds<T>::type element_type;
    47     typedef deleter_base<element_type> base;
    48     array_deleter() : base(do_delete) { }
    49     static void do_delete(element_type* t) { checked_array_delete(t); }
    50 };
    51 
    52 } // End namespace ptr_container_detail.
    53 
    54 template<typename T>
    55 struct default_deleter
    56     : mpl::if_<
    57           is_array<T>,
    58           ptr_container_detail::array_deleter<T>,
    59           ptr_container_detail::scalar_deleter<T>
    60       >::type
    61 { 
    62     default_deleter() { }
    63     template<typename TT>
    64     default_deleter(default_deleter<TT> tt) { }
    65 };
    66 
    67 } } } // End namespaces ptr_container_detail, move_ptrs, boost.
    68 
    69 #endif // #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED