Adobe Open Source: dynamic_io.hpp Source File

00001 /*
00002   Copyright 2005-2006 Adobe Systems Incorporated
00003   Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt
00004   or a copy at http://opensource.adobe.com/licenses.html)
00005 */
00006 
00007 /*************************************************************************************************/
00008 
00009 #ifndef GIL_DYNAMIC_IO_H
00010 #define GIL_DYNAMIC_IO_H
00011 
00014 //
00018 
00019 #include <boost/mpl/at.hpp>
00020 #include <boost/mpl/size.hpp>
00021 #include "../../core/gil_config.hpp"
00022 #include "../dynamic_image/any_image.hpp"
00023 
00024 ADOBE_GIL_NAMESPACE_BEGIN
00025 
00026 namespace detail {
00027 
00028 template <long N>
00029 struct construct_matched_t {
00030     template <typename IMAGES,typename PRED>
00031     static bool apply(any_image<IMAGES>& im,PRED pred) {
00032         if (pred.template apply<typename boost::mpl::at_c<IMAGES,N-1>::type>()) {
00033             im.move_in(typename boost::mpl::at_c<IMAGES,N-1>::type());
00034             return true;
00035         } else return construct_matched_t<N-1>::apply(im,pred);
00036     }
00037 };
00038 template <>
00039 struct construct_matched_t<0> {
00040     template <typename IMAGES,typename PRED>
00041     static bool apply(any_image<IMAGES>&,PRED) {return false;}
00042 };
00043 
00044 // A function object that can be passed to apply_operation.
00045 // Given a predicate IS_SUPPORTED taking a view type and returning an MPL boolean,
00046 // calls the apply method of OP_CLASS with the view if the given view IS_SUPPORTED, or throws an exception otherwise
00047 template <typename IS_SUPPORTED, typename OP_CLASS>
00048 class dynamic_io_fnobj {
00049     OP_CLASS* _op;
00050 
00051     template <typename VIEW>
00052     void apply(const VIEW& view,boost::mpl::true_ ) {_op->apply(view);}
00053     template <typename VIEW>
00054     void apply(const VIEW& view,boost::mpl::false_) {io_error("dynamic_io: unsupported view type for the given file format");}
00055 public:
00056     dynamic_io_fnobj(OP_CLASS* op) : _op(op) {}
00057 
00058     typedef void result_type;
00059 
00060     template <typename VIEW>
00061     void operator()(const VIEW& view) {apply(view,typename IS_SUPPORTED::template apply<VIEW>::type());}
00062 };
00063 
00064 } // namespace detail
00065 
00068 template <typename IMAGES,typename PRED>
00069 inline bool construct_matched(any_image<IMAGES>& im,PRED pred) {
00070     return detail::construct_matched_t<boost::mpl::size<IMAGES>::value>::apply(im,pred);
00071 }
00072 
00073 ADOBE_GIL_NAMESPACE_END
00074 
00075 #endif
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dynamic_io.hpp
