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<!DOCTYPE html>
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<title>dip::GenericImageIterator class | DIPlib | a library for quantitative image analysis</title>
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<a href="https://diplib.org"><img src="DIPlib_logo.svg" alt="" />DIPlib</a><span class="m-breadcrumb">┃</span><a href="index.html" class="m-thin">a library for quantitative image analysis</a><span class="m-breadcrumb">┃</span><a href="https://github.com/DIPlib/diplib/releases/tag/3.5.2" class="m-thin">version 3.5.2</a> </span>
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<h1>
<div class="m-doc-include m-thin m-right-m m-text-right">
<a href="iterators.html" class="m-doc">Iterators</a> module<br/><span class="m-code m-thin">#include <a href="file--diplib--generic_iterators-h.html">"diplib/generic_iterators.h"</a></span> </div>
<div class="m-doc-template"><span class="m-doc-wrap-bumper">template<</span><span class="m-doc-wrap">typename T = <a href="pixeltypes.html#dip-dfloat" class="m-doc">dip::dfloat</a>></span></div>
<span class="m-breadcrumb"><a href="dip.html">dip</a>::<wbr/></span>GenericImageIterator <span class="m-thin">class</span> </h1>
<p>A data-type–agnostic version of <a href="dip-ImageIterator-T.html"><code>dip::ImageIterator</code></a>. Use this iterator only to write code that
does not know at compile-time what the data type of the image is.</p>
<div class="m-block m-default">
<h3>Contents</h3>
<ul>
<li>
Reference
<ul>
<li><a href="#typeless-methods">Constructors, destructors, assignment and conversion operators</a></li>
<li><a href="#alias-members">Aliases</a></li>
<li><a href="#function-members">Functions</a></li>
<li><a href="#operator-members">Operators</a></li>
</ul>
</li>
</ul>
</div>
<p>This iterator works similarly to <a href="dip-ImageIterator-T.html"><code>dip::ImageIterator</code></a>. The <code>Pointer</code> method returns a <code>void</code> pointer to
the first sample in the pixel. This is the more efficient way of using the iterator.</p>
<p>Dereferencing the iterator returns a <a href="dip-Image-Pixel.html"><code>dip::Image::Pixel</code></a> object (actually a <a href="dip-Image-CastPixel-T.html"><code>dip::Image::CastPixel</code></a>),
and the <code>[]</code> operator return a <a href="dip-Image-Sample.html"><code>dip::Image::Sample</code></a> object (actually a <a href="dip-Image-CastSample-T.html"><code>dip::Image::CastSample</code></a>).
These objects reference the pixel or sample, assigning to them changes the
pixel’s values in the image. They are convenient in use, but not very efficient. The optional template
argument to <code>GenericImageIterator</code> sets the template argument to the <code>dip::Image::CastPixel</code> object
that is actually returned by dereferencing the iterator. Choose a type in which you wish to work, but
know that this choice will not affect the results of reading from and assigning to the dereferenced
iterator. The only difference is the type to which the dereferenced iterator can implicitly be cast to.</p>
<p>Example usage from <a href="dip-Image.html#dip-CopyTo-Image-CL-Image-L-Image-CL"><code>dip::CopyTo</code></a>:</p>
<div class="m-code"><pre><span></span><span class="k">auto</span><span class="w"> </span><span class="n">arrIt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">offsets</span><span class="p">.</span><span class="n">begin</span><span class="p">();</span>
<span class="n">GenericImageIterator</span><span class="o"><></span><span class="w"> </span><span class="n">srcIt</span><span class="p">(</span><span class="w"> </span><span class="n">src</span><span class="w"> </span><span class="p">);</span>
<span class="k">do</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">Image</span><span class="o">::</span><span class="n">Pixel</span><span class="w"> </span><span class="nf">d</span><span class="p">(</span><span class="w"> </span><span class="n">dest</span><span class="p">.</span><span class="n">Pointer</span><span class="p">(</span><span class="w"> </span><span class="o">*</span><span class="n">arrIt</span><span class="w"> </span><span class="p">),</span><span class="w"> </span><span class="n">dest</span><span class="p">.</span><span class="n">DataType</span><span class="p">(),</span><span class="w"> </span><span class="n">dest</span><span class="p">.</span><span class="n">Tensor</span><span class="p">(),</span><span class="w"> </span><span class="n">dest</span><span class="p">.</span><span class="n">TensorStride</span><span class="p">()</span><span class="w"> </span><span class="p">);</span>
<span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">*</span><span class="n">srcIt</span><span class="p">;</span>
<span class="p">}</span><span class="w"> </span><span class="k">while</span><span class="p">(</span><span class="w"> </span><span class="o">++</span><span class="n">arrIt</span><span class="p">,</span><span class="w"> </span><span class="o">++</span><span class="n">srcIt</span><span class="w"> </span><span class="p">);</span><span class="w"> </span><span class="c1">// these two must end at the same time, we test the image iterator,</span>
<span class="w"> </span><span class="c1">// as arrIt should be compared with the end iterator.</span>
</pre></div>
<p>Note that when an image is stripped or reforged, all its iterators are invalidated.</p>
<aside class="m-note m-default">
<h4>See also</h4>
<p><a href="using_iterators.html">Using iterators to implement filters</a>, <a href="dip-ImageIterator-T.html"><code>dip::ImageIterator</code></a>, <a href="dip-GenericJointImageIterator-T.html"><code>dip::GenericJointImageIterator</code></a></p>
</aside>
<section id="typeless-methods">
<h2>Constructors, destructors, assignment and conversion operators</h2>
<dl class="m-doc">
<dt id="dip-GenericImageIterator-T-GenericImageIterator">
<span class="m-doc-wrap-bumper"><a href="#dip-GenericImageIterator-T-GenericImageIterator" class="m-doc-self">GenericImageIterator</a>(</span><span class="m-doc-wrap">)</span>
</dt>
<dd>Default constructor yields an invalid iterator that cannot be dereferenced, and is equivalent to an end iterator</dd>
<dt id="dip-GenericImageIterator-T-GenericImageIterator-Image-CL-dip-uint-">
<span class="m-doc-wrap-bumper"><a href="#dip-GenericImageIterator-T-GenericImageIterator-Image-CL-dip-uint-" class="m-doc-self">GenericImageIterator</a>(</span><span class="m-doc-wrap"><a href="dip-Image.html" class="m-doc">dip::Image</a> const& image,
<a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a> procDim = std::numeric_limits<dip::uint>::max()) <span class="m-label m-flat m-info">explicit</span> </span>
</dt>
<dd>To construct a useful iterator, provide an image and optionally a processing dimension</dd>
</dl>
</section>
<section id="alias-members">
<h2>Aliases</h2>
<dl class="m-doc">
<dt id="dip-GenericImageIterator-T-iterator_category">
using <a href="#dip-GenericImageIterator-T-iterator_category" class="m-doc-self">iterator_category</a> = std::forward_iterator_tag
</dt>
<dd>Iterator category</dd>
<dt id="dip-GenericImageIterator-T-value_type">
using <a href="#dip-GenericImageIterator-T-value_type" class="m-doc-self">value_type</a> = <a href="dip-Image-CastPixel-T.html" class="m-doc">dip::Image::CastPixel</a>
</dt>
<dd>The type of the pixel, obtained when dereferencing the iterator</dd>
<dt id="dip-GenericImageIterator-T-reference">
using <a href="#dip-GenericImageIterator-T-reference" class="m-doc-self">reference</a> = <a href="dip-GenericImageIterator-T.html#dip-GenericImageIterator-T-value_type" class="m-doc">dip::GenericImageIterator::value_type</a>
</dt>
<dd>The type of a reference to a pixel (note dip::Image::CastPixel references a value in the image)</dd>
<dt id="dip-GenericImageIterator-T-pointer">
using <a href="#dip-GenericImageIterator-T-pointer" class="m-doc-self">pointer</a> = <a href="dip-GenericImageIterator-T.html#dip-GenericImageIterator-T-value_type" class="m-doc">dip::GenericImageIterator::value_type</a>*
</dt>
<dd>The type of a pointer to a pixel</dd>
</dl>
</section>
<section id="function-members">
<h2>Functions</h2>
<dl class="m-doc">
<dt id="dip-GenericImageIterator-T-swap-T-GenericImageIterator<S>-L">
<div class="m-doc-template">template<typename S></div>
<span class="m-doc-wrap-bumper">void <a href="#dip-GenericImageIterator-T-swap-T-GenericImageIterator<S>-L" class="m-doc-self">swap</a>(</span><span class="m-doc-wrap"><a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>& other)</span>
</dt>
<dd>Swap</dd>
<dt id="dip-GenericImageIterator-T-begin-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-begin-C" class="m-doc-self">begin</a>(</span><span class="m-doc-wrap">) const -> typename value_type::Iterator</span>
</dt>
<dd>Get an iterator over the tensor for the current pixel, <code>it.begin()</code> is equal to <code>(*it).begin()</code>.</dd>
<dt id="dip-GenericImageIterator-T-end-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-end-C" class="m-doc-self">end</a>(</span><span class="m-doc-wrap">) const -> typename value_type::Iterator</span>
</dt>
<dd>Get an end iterator over the tensor for the current pixel</dd>
<dt id="dip-GenericImageIterator-T-GetLineIterator-T-C">
<div class="m-doc-template">template<typename S = T></div>
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-GetLineIterator-T-C" class="m-doc-self">GetLineIterator</a>(</span><span class="m-doc-wrap">) const -> <a href="dip-LineIterator-T.html" class="m-doc">dip::LineIterator</a></span>
</dt>
<dd>Get an iterator over the current line</dd>
<dt id="dip-GenericImageIterator-T-GetConstLineIterator-T-C">
<div class="m-doc-template">template<typename S = T></div>
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-GetConstLineIterator-T-C" class="m-doc-self">GetConstLineIterator</a>(</span><span class="m-doc-wrap">) const -> <a href="dip-LineIterator-T.html#dip-ConstLineIterator-T" class="m-doc">dip::ConstLineIterator</a></span>
</dt>
<dd>Get a const iterator over the current line</dd>
<dt id="dip-GenericImageIterator-T-IsAtEnd-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-IsAtEnd-C" class="m-doc-self">IsAtEnd</a>(</span><span class="m-doc-wrap">) const -> bool</span>
</dt>
<dd>Test to see if the iterator reached past the last pixel</dd>
<dt id="dip-GenericImageIterator-T-Coordinates-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Coordinates-C" class="m-doc-self">Coordinates</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-UnsignedArray" class="m-doc">dip::UnsignedArray</a> const&</span>
</dt>
<dd>Return the current coordinates</dd>
<dt id="dip-GenericImageIterator-T-SetCoordinates-UnsignedArray-">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-SetCoordinates-UnsignedArray-" class="m-doc-self">SetCoordinates</a>(</span><span class="m-doc-wrap"><a href="supporttypes.html#dip-UnsignedArray" class="m-doc">dip::UnsignedArray</a> coords) -> <a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>&</span>
</dt>
<dd>Set the iterator to point at a different location in the image</dd>
<dt id="dip-GenericImageIterator-T-Sizes-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Sizes-C" class="m-doc-self">Sizes</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-UnsignedArray" class="m-doc">dip::UnsignedArray</a> const&</span>
</dt>
<dd>Return the sizes of the image we’re iterating over.</dd>
<dt id="dip-GenericImageIterator-T-ProcessingDimensionSize-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-ProcessingDimensionSize-C" class="m-doc-self">ProcessingDimensionSize</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a></span>
</dt>
<dd>Return the size along the processing dimension</dd>
<dt id="dip-GenericImageIterator-T-Strides-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Strides-C" class="m-doc-self">Strides</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-IntegerArray" class="m-doc">dip::IntegerArray</a> const&</span>
</dt>
<dd>Return the strides used to iterate over the image.</dd>
<dt id="dip-GenericImageIterator-T-ProcessingDimensionStride-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-ProcessingDimensionStride-C" class="m-doc-self">ProcessingDimensionStride</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-sint" class="m-doc">dip::sint</a></span>
</dt>
<dd>Return the stride along the processing dimension</dd>
<dt>
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-IsOnEdge-C" class="m-doc">IsOnEdge</a>(</span><span class="m-doc-wrap">) const -> bool</span>
</dt>
<dd>Return true if the iterator points at a pixel on the edge of the image. <a href="#dip-GenericImageIterator-T-IsOnEdge-C">more...</a></dd>
<dt id="dip-GenericImageIterator-T-Pointer-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Pointer-C" class="m-doc-self">Pointer</a>(</span><span class="m-doc-wrap">) const -> void*</span>
</dt>
<dd>Return the current pointer</dd>
<dt id="dip-GenericImageIterator-T-Pointer-dip-uint--C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Pointer-dip-uint--C" class="m-doc-self">Pointer</a>(</span><span class="m-doc-wrap"><a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a> index) const -> void*</span>
</dt>
<dd>Return a pointer to the tensor element <code>index</code></dd>
<dt id="dip-GenericImageIterator-T-Offset-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Offset-C" class="m-doc-self">Offset</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-sint" class="m-doc">dip::sint</a></span>
</dt>
<dd>Return the current offset</dd>
<dt id="dip-GenericImageIterator-T-Index-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Index-C" class="m-doc-self">Index</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a></span>
</dt>
<dd>Return the current index, which is computed: this function is not trivial</dd>
<dt id="dip-GenericImageIterator-T-HasProcessingDimension-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-HasProcessingDimension-C" class="m-doc-self">HasProcessingDimension</a>(</span><span class="m-doc-wrap">) const -> bool</span>
</dt>
<dd>True if the processing dimension is set</dd>
<dt id="dip-GenericImageIterator-T-ProcessingDimension-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-ProcessingDimension-C" class="m-doc-self">ProcessingDimension</a>(</span><span class="m-doc-wrap">) const -> <a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a></span>
</dt>
<dd>Return the processing dimension, the direction of the lines over which the iterator iterates</dd>
<dt id="dip-GenericImageIterator-T-Reset">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Reset" class="m-doc-self">Reset</a>(</span><span class="m-doc-wrap">) -> <a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>&</span>
</dt>
<dd>Reset the iterator to the first pixel in the image (as it was when first created)</dd>
<dt>
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-Optimize" class="m-doc">Optimize</a>(</span><span class="m-doc-wrap">) -> <a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>&</span>
</dt>
<dd>Optimizes the order in which the iterator visits the image pixels. <a href="#dip-GenericImageIterator-T-Optimize">more...</a></dd>
<dt id="dip-GenericImageIterator-T-OptimizeAndFlatten">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-OptimizeAndFlatten" class="m-doc-self">OptimizeAndFlatten</a>(</span><span class="m-doc-wrap">) -> <a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>&</span>
</dt>
<dd>Like <code>Optimize</code>, but additionally folds dimensions together where possible (flattens the image,
so that the iterator has fewer dimensions to work with). The processing dimension is not affected.</dd>
</dl>
</section>
<section id="operator-members">
<h2>Operators</h2>
<dl class="m-doc">
<dt id="dip-GenericImageIterator-T-operator%2A-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%2A-C" class="m-doc-self">operator*</a>(</span><span class="m-doc-wrap">) const -> <a href="dip-GenericImageIterator-T.html#dip-GenericImageIterator-T-value_type" class="m-doc">dip::GenericImageIterator::value_type</a></span>
</dt>
<dd>Dereference</dd>
<dt id="dip-GenericImageIterator-T-operator%5B%5D-dip-uint--C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%5B%5D-dip-uint--C" class="m-doc-self">operator[]</a>(</span><span class="m-doc-wrap"><a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a> index) const -> <a href="dip-Image-CastSample-T.html" class="m-doc">dip::Image::CastSample</a></span>
</dt>
<dd>Index into tensor, <code>it[index]</code> is equal to <code>(*it)[index]</code>.</dd>
<dt id="dip-GenericImageIterator-T-operator%2B%2B">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%2B%2B" class="m-doc-self">operator++</a>(</span><span class="m-doc-wrap">) -> <a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>&</span>
</dt>
<dd>Pre-increment</dd>
<dt id="dip-GenericImageIterator-T-operator%2B%2B-int-">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%2B%2B-int-" class="m-doc-self">operator++</a>(</span><span class="m-doc-wrap">int ) -> <a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a></span>
</dt>
<dd>Post-increment</dd>
<dt id="dip-GenericImageIterator-T-operator%3D%3D-T-GenericImageIterator<S>-CL-C">
<div class="m-doc-template">template<typename S></div>
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%3D%3D-T-GenericImageIterator<S>-CL-C" class="m-doc-self">operator==</a>(</span><span class="m-doc-wrap"><a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a> const& other) const -> bool</span>
</dt>
<dd>Equality comparison, is equal if the two iterators have the same coordinates. It is possible to compare
GenericImageIterator with different images.</dd>
<dt id="dip-GenericImageIterator-T-operator%21%3D-T-GenericImageIterator<S>-CL-C">
<div class="m-doc-template">template<typename S></div>
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%21%3D-T-GenericImageIterator<S>-CL-C" class="m-doc-self">operator!=</a>(</span><span class="m-doc-wrap"><a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a> const& other) const -> bool</span>
</dt>
<dd>Inequality comparison</dd>
<dt id="dip-GenericImageIterator-T-operator%20bool-C">
<span class="m-doc-wrap-bumper">auto <a href="#dip-GenericImageIterator-T-operator%20bool-C" class="m-doc-self">operator bool</a>(</span><span class="m-doc-wrap">) const -> bool <span class="m-label m-flat m-info">explicit</span> </span>
</dt>
<dd>Test to see if the iterator is still pointing at a pixel</dd>
</dl>
</section>
<section>
<h2>Function documentation</h2>
<section class="m-doc-details" id="dip-GenericImageIterator-T-IsOnEdge-C"><div>
<h3>
<div class="m-doc-template">
template<typename T>
</div>
<span class="m-doc-wrap-bumper">bool
</span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#dip-GenericImageIterator-T-IsOnEdge-C" class="m-doc-self">IsOnEdge</a>(</span><span class="m-doc-wrap">) const</span></span>
</h3>
<p>Return true if the iterator points at a pixel on the edge of the image.</p>
<p>If there is a processing dimension, then the iterator always points at an edge pixel; in this case
only returns true if all pixels on the line are edge pixels (i.e. the first and last pixel of the
line are not counted).</p>
</div></section>
<section class="m-doc-details" id="dip-GenericImageIterator-T-Optimize"><div>
<h3>
<div class="m-doc-template">
template<typename T>
</div>
<span class="m-doc-wrap-bumper"><a href="dip-GenericImageIterator-T.html" class="m-doc">dip::GenericImageIterator</a>&
</span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#dip-GenericImageIterator-T-Optimize" class="m-doc-self">Optimize</a>(</span><span class="m-doc-wrap">)</span></span>
</h3>
<p>Optimizes the order in which the iterator visits the image pixels.</p>
<p>The iterator internally reorders and flips image dimensions to change the linear index to match
the storage order (see <a href="dip-Image.html#dip-Image-StandardizeStrides"><code>dip::Image::StandardizeStrides</code></a>).
If the image’s strides were not normal, this will significantly increase the speed of reading or
writing to the image. Expanded singleton dimensions are eliminated, meaning that each pixel is
always only accessed once. Additionally, singleton dimensions are ignored.</p>
<p>After calling this function, <code>Coordinates</code> and <code>Index</code> no longer match the input image. Do not
use this method if the order of accessing pixels is relevant, or if <code>Coordinates</code> are needed.</p>
<p>Note that the processing dimension stride could change sign. Use <code>ProcessingDimensionStride</code>.
If the processing dimension was a singleton dimension, or singleton-expanded, the iterator will
no longer have a singleton dimension. In this case, <code>HasProcessingDimension</code> will return false.</p>
<p>The iterator is reset to the first pixel.</p>
</div></section>
</section>
</div>
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