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‎14882.css‎

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‎accumulate.html‎

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<!DOCTYPE html><html lang='en'><head><title>[accumulate]</title><meta charset='UTF-8'/><link rel='stylesheet' type='text/css' href='14882.css'/><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Noto+Serif'/><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Noto+Sans'/><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Noto+Sans+Mono'/><link rel='icon' href='icon.png'/><link rel='stylesheet' type='text/css' href='expanded.css' title='Normal'/><link rel='alternate stylesheet' type='text/css' href='colored.css' title='Notes and examples colored'/><link rel='alternate stylesheet' type='text/css' href='normative-only.css' title='Notes and examples hidden'/></head><body><div class='wrapper'><h1 ><a class='secnum' style='min-width:50pt'>27</a> Algorithms library <a class='abbr_ref' href='./#algorithms'>[algorithms]</a></h1><h2 ><a class='secnum' style='min-width:65pt'>27.10</a> Generalized numeric operations <a class='abbr_ref' href='numeric.ops#accumulate'>[numeric.ops]</a></h2><h3 ><a class='secnum' style='min-width:80pt'>27.10.3</a> Accumulate <a class='abbr_ref'>[accumulate]</a></h3><div class='texpara'><div id='lib:accumulate'><div class='itemdecl'><div class='marginalizedparent'><a class='itemDeclLink' href='#lib:accumulate'>🔗</a></div><code class='itemdeclcode'><span class='keyword'>template</span><span class='anglebracket'>&lt;</span><span class='keyword'>class</span> InputIterator, <span class='keyword'>class</span> T<span class='anglebracket'>&gt;</span>
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<!DOCTYPE html><html lang='en'><head><title>[accumulate]</title><meta charset='UTF-8'/><link rel='stylesheet' type='text/css' href='14882.css'/><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Noto+Serif'/><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Noto+Sans'/><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Noto+Sans+Mono'/><link rel='icon' href='icon.png'/><link rel='stylesheet' type='text/css' href='expanded.css' title='Normal'/><link rel='alternate stylesheet' type='text/css' href='colored.css' title='Notes and examples colored'/><link rel='alternate stylesheet' type='text/css' href='normative-only.css' title='Notes and examples hidden'/></head><body><div class='wrapper'><h1 ><a class='secnum' style='min-width:50pt'>26</a> Algorithms library <a class='abbr_ref' href='./#algorithms'>[algorithms]</a></h1><h2 ><a class='secnum' style='min-width:65pt'>26.10</a> Generalized numeric operations <a class='abbr_ref' href='numeric.ops#accumulate'>[numeric.ops]</a></h2><h3 ><a class='secnum' style='min-width:80pt'>26.10.3</a> Accumulate <a class='abbr_ref'>[accumulate]</a></h3><div class='texpara'><div id='lib:accumulate'><div class='itemdecl'><div class='marginalizedparent'><a class='itemDeclLink' href='#lib:accumulate'>🔗</a></div><code class='itemdeclcode'><span class='keyword'>template</span><span class='anglebracket'>&lt;</span><span class='keyword'>class</span> InputIterator, <span class='keyword'>class</span> T<span class='anglebracket'>&gt;</span>
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<span class='keyword'>constexpr</span> T accumulate<span class='parenthesis'>(</span>InputIterator first, InputIterator last, T init<span class='parenthesis'>)</span>;
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<span class='keyword'>template</span><span class='anglebracket'>&lt;</span><span class='keyword'>class</span> InputIterator, <span class='keyword'>class</span> T, <span class='keyword'>class</span> BinaryOperation<span class='anglebracket'>&gt;</span>
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<span class='keyword'>constexpr</span> T accumulate<span class='parenthesis'>(</span>InputIterator first, InputIterator last, T init,
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BinaryOperation binary_op<span class='parenthesis'>)</span>;
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</code></div></div></div><div class='para' id='1'><div class='marginalizedparent'><a class='marginalized' href='#1'>1</a></div><div class='itemdescr'><div class='sourceLinkParent'><a class='sourceLink' href='https://github.com/cplusplus/draft/tree/9243ba5befaea8fd3e878e6114942db8d556a6e0/source/algorithms.tex#L9777'>#</a></div><div class='texpara'><div id='1.sentence-1' class='sentence'><i >Preconditions</i>: <span class='texttt'>T</span> meets
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the <i >Cpp17CopyConstructible</i> (Table <a href='utility.arg.requirements#tab:cpp17.copyconstructible' title='Table 32: Cpp17CopyConstructible requirements (in addition to Cpp17MoveConstructible)'>32</a>)
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and <i >Cpp17CopyAssignable</i> (Table <a href='utility.arg.requirements#tab:cpp17.copyassignable' title='Table 34: Cpp17CopyAssignable requirements (in addition to Cpp17MoveAssignable)'>34</a>) requirements<a class='hidden_link' href='#1.sentence-1'>.</a></div> <div id='1.sentence-2' class='sentence'>In the range [<span class='texttt'>first, last</span>],
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</code></div></div></div><div class='para' id='1'><div class='marginalizedparent'><a class='marginalized' href='#1'>1</a></div><div class='itemdescr'><div class='sourceLinkParent'><a class='sourceLink' href='https://github.com/cplusplus/draft/tree/bf43925ff0d9e80997918e98989892b4c7bf15f7/source/algorithms.tex#L9944'>#</a></div><div class='texpara'><div id='1.sentence-1' class='sentence'><i >Preconditions</i>: <span class='texttt'>T</span> meets
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the <a href='utility.arg.requirements#:Cpp17CopyConstructible' title='16.4.4.2&emsp;Template argument requirements&emsp;[utility.arg.requirements]'><i >Cpp17CopyConstructible</i></a> (Table <a href='utility.arg.requirements#tab:cpp17.copyconstructible' title='Table 32: Cpp17CopyConstructible requirements (in addition to Cpp17MoveConstructible)'>32</a>)
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and <a href='utility.arg.requirements#:Cpp17CopyAssignable' title='16.4.4.2&emsp;Template argument requirements&emsp;[utility.arg.requirements]'><i >Cpp17CopyAssignable</i></a> (Table <a href='utility.arg.requirements#tab:cpp17.copyassignable' title='Table 34: Cpp17CopyAssignable requirements (in addition to Cpp17MoveAssignable)'>34</a>) requirements<a class='hidden_link' href='#1.sentence-1'>.</a></div> <div id='1.sentence-2' class='sentence'>In the range [<span class='texttt'>first, last</span>],
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<span class='texttt'>binary_<span class='shy'></span>op</span> neither modifies elements
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nor invalidates iterators or subranges<a class='hidden_link' href='#1.sentence-2'>.</a><a class='footnoteref' href='#footnote-214' id='footnoteref-214' title='The use of fully closed ranges is intentional.'>214</a></div></div></div></div><div class='para' id='2'><div class='marginalizedparent'><a class='marginalized' href='#2'>2</a></div><div class='itemdescr'><div class='sourceLinkParent'><a class='sourceLink' href='https://github.com/cplusplus/draft/tree/9243ba5befaea8fd3e878e6114942db8d556a6e0/source/algorithms.tex#L9789'>#</a></div><div class='texpara'><div id='2.sentence-1' class='sentence'><i >Effects</i>: Computes its result by
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nor invalidates iterators or subranges<a class='hidden_link' href='#1.sentence-2'>.</a><a class='footnoteref' href='#footnote-210' id='footnoteref-210' title='The use of fully closed ranges is intentional.'>210</a></div></div></div></div><div class='para' id='2'><div class='marginalizedparent'><a class='marginalized' href='#2'>2</a></div><div class='itemdescr'><div class='sourceLinkParent'><a class='sourceLink' href='https://github.com/cplusplus/draft/tree/bf43925ff0d9e80997918e98989892b4c7bf15f7/source/algorithms.tex#L9956'>#</a></div><div class='texpara'><div id='2.sentence-1' class='sentence'><i >Effects</i>: Computes its result by
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initializing the accumulator <span class='texttt'>acc</span> with the initial value <span class='texttt'>init</span>
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and then modifies it with
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<span class='texttt'>acc <span class='operator'>=</span> std<span class='operator'>&#x200b;::&#x200b;</span>move<span class='parenthesis'>(</span>acc<span class='parenthesis'>)</span> <span class='operator'>+</span> <span class='operator'>*</span>i</span> or
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<span class='texttt'>acc <span class='operator'>=</span> binary_<span class='shy'></span>op<span class='parenthesis'>(</span>std<span class='operator'>&#x200b;::&#x200b;</span>move<span class='parenthesis'>(</span>acc<span class='parenthesis'>)</span>, <span class='operator'>*</span>i<span class='parenthesis'>)</span></span>
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for every iterator <span class='texttt'>i</span> in the range [<span class='texttt'>first, last</span>) in order<a class='hidden_link' href='#2.sentence-1'>.</a><a class='footnoteref' href='#footnote-215' id='footnoteref-215' title='accumulate is similar to the APL reduction operator and Common Lisp reduce function, but it avoids the difficulty of defining the result of reduction on an empty sequence by always requiring an initial value.'>215</a></div></div></div></div><div class='footnoteSeparator'></div><div class='footnote' id='footnote-214'><div class='texpara'><a class='footnotenum' href='#footnote-214'>214)</a><a class='footnoteBacklink' href='#footnoteref-214'>214)</a> <div id='footnote-214.sentence-1' class='sentence'>The use of fully closed ranges is intentional<a class='hidden_link' href='#footnote-214.sentence-1'>.</a></div></div></div><div class='footnote' id='footnote-215'><div class='texpara'><a class='footnotenum' href='#footnote-215'>215)</a><a class='footnoteBacklink' href='#footnoteref-215'>215)</a> <div id='footnote-215.sentence-1' class='sentence'><span class='texttt'>accumulate</span> is similar
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for every iterator <span class='texttt'>i</span> in the range [<span class='texttt'>first, last</span>) in order<a class='hidden_link' href='#2.sentence-1'>.</a><a class='footnoteref' href='#footnote-211' id='footnoteref-211' title='accumulate is similar to the APL reduction operator and Common Lisp reduce function, but it avoids the difficulty of defining the result of reduction on an empty sequence by always requiring an initial value.'>211</a></div></div></div></div><div class='footnoteSeparator'></div><div class='footnote' id='footnote-210'><div class='texpara'><a class='footnotenum' href='#footnote-210'>210)</a><a class='footnoteBacklink' href='#footnoteref-210'>210)</a> <div id='footnote-210.sentence-1' class='sentence'>The use of fully closed ranges is intentional<a class='hidden_link' href='#footnote-210.sentence-1'>.</a></div></div></div><div class='footnote' id='footnote-211'><div class='texpara'><a class='footnotenum' href='#footnote-211'>211)</a><a class='footnoteBacklink' href='#footnoteref-211'>211)</a> <div id='footnote-211.sentence-1' class='sentence'><span class='texttt'>accumulate</span> is similar
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to the APL reduction operator and Common Lisp reduce function,
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but it avoids the difficulty of defining the result of reduction
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on an empty sequence by always requiring an initial value<a class='hidden_link' href='#footnote-215.sentence-1'>.</a></div></div></div></div></body></html>
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on an empty sequence by always requiring an initial value<a class='hidden_link' href='#footnote-211.sentence-1'>.</a></div></div></div></div></body></html>

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