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<h1>dynamic_io.hpp</h1><a href="g_i_l_0085.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright 2005-2007 Adobe Systems Incorporated</span>
<a name="l00003"></a>00003 <span class="comment"> </span>
<a name="l00004"></a>00004 <span class="comment"> Use, modification and distribution are subject to the Boost Software License,</span>
<a name="l00005"></a>00005 <span class="comment"> Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
<a name="l00006"></a>00006 <span class="comment"> http://www.boost.org/LICENSE_1_0.txt).</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> See http://opensource.adobe.com/gil for most recent version including documentation.</span>
<a name="l00009"></a>00009 <span class="comment">*/</span>
<a name="l00010"></a>00010 <span class="comment">/*************************************************************************************************/</span>
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="preprocessor">#ifndef GIL_DYNAMIC_IO_H</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#define GIL_DYNAMIC_IO_H</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <boost/mpl/at.hpp></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <boost/mpl/size.hpp></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include "../../gil_config.hpp"</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="io__error_8hpp.html" title="Handle input-output errors.">io_error.hpp</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "../dynamic_image/any_image.hpp"</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keyword">namespace </span>detail {
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keyword">template</span> <<span class="keywordtype">long</span> N>
<a name="l00033"></a>00033 <span class="keyword">struct </span>construct_matched_t {
<a name="l00034"></a>00034 <span class="keyword">template</span> <<span class="keyword">typename</span> Images,<span class="keyword">typename</span> Pred>
<a name="l00035"></a>00035 <span class="keyword">static</span> <span class="keywordtype">bool</span> apply(any_image<Images>& im,Pred pred) {
<a name="l00036"></a>00036 <span class="keywordflow">if</span> (pred.template apply<<span class="keyword">typename</span> mpl::at_c<Images,N-1>::type>()) {
<a name="l00037"></a>00037 <span class="keyword">typename</span> mpl::at_c<Images,N-1>::type x;
<a name="l00038"></a>00038 im.move_in(x);
<a name="l00039"></a>00039 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00040"></a>00040 } <span class="keywordflow">else</span> <span class="keywordflow">return</span> construct_matched_t<N-1>::apply(im,pred);
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042 };
<a name="l00043"></a>00043 <span class="keyword">template</span> <>
<a name="l00044"></a>00044 <span class="keyword">struct </span>construct_matched_t<0> {
<a name="l00045"></a>00045 <span class="keyword">template</span> <<span class="keyword">typename</span> Images,<span class="keyword">typename</span> Pred>
<a name="l00046"></a>00046 <span class="keyword">static</span> <span class="keywordtype">bool</span> apply(any_image<Images>&,Pred) {<span class="keywordflow">return</span> <span class="keyword">false</span>;}
<a name="l00047"></a>00047 };
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="comment">// A function object that can be passed to apply_operation.</span>
<a name="l00050"></a>00050 <span class="comment">// Given a predicate IsSupported taking a view type and returning an MPL boolean,</span>
<a name="l00051"></a>00051 <span class="comment">// calls the apply method of OpClass with the view if the given view IsSupported, or throws an exception otherwise</span>
<a name="l00052"></a>00052 <span class="keyword">template</span> <<span class="keyword">typename</span> IsSupported, <span class="keyword">typename</span> OpClass>
<a name="l00053"></a>00053 <span class="keyword">class </span>dynamic_io_fnobj {
<a name="l00054"></a>00054 OpClass* _op;
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keyword">template</span> <<span class="keyword">typename</span> View>
<a name="l00057"></a>00057 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& <a class="code" href="g_i_l_0135.html#g55e45a15dddfc0d870c2f7fb9739cb2e" title="Returns the non-constant-pixel view of any image. The returned view is any view.">view</a>,mpl::true_ ) {_op->apply(view);}
<a name="l00058"></a>00058 <span class="keyword">template</span> <<span class="keyword">typename</span> View>
<a name="l00059"></a>00059 <span class="keywordtype">void</span> apply(<span class="keyword">const</span> View& view,mpl::false_) {io_error(<span class="stringliteral">"dynamic_io: unsupported view type for the given file format"</span>);}
<a name="l00060"></a>00060 <span class="keyword">public</span>:
<a name="l00061"></a>00061 dynamic_io_fnobj(OpClass* op) : _op(op) {}
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keyword">typedef</span> <span class="keywordtype">void</span> result_type;
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keyword">template</span> <<span class="keyword">typename</span> View>
<a name="l00066"></a>00066 <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> View& view) {apply(view,<span class="keyword">typename</span> IsSupported::template apply<View>::type());}
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068
<a name="l00069"></a>00069 } <span class="comment">// namespace detail</span>
<a name="l00070"></a>00070
<a name="l00073"></a>00073 <span class="keyword">template</span> <<span class="keyword">typename</span> Images,<span class="keyword">typename</span> Pred>
<a name="l00074"></a>00074 <span class="keyword">inline</span> <span class="keywordtype">bool</span> construct_matched(any_image<Images>& im,Pred pred) {
<a name="l00075"></a>00075 <span class="keywordflow">return</span> detail::construct_matched_t<mpl::size<Images>::value>::apply(im,pred);
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077
<a name="l00078"></a>00078 } } <span class="comment">// namespace boost::gil</span>
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="preprocessor">#endif</span>
</pre></div></div>
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