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< html >
< head >
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< meta http-equiv = "Content-Type" content = "text/html; charset=US-ASCII" >
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< title > equal</ title >
< link rel = "stylesheet" href = "../../../../../../../../doc/html/boostbook.css" type = "text/css" >
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<<<<<< < .working
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< meta name = "generator" content = "DocBook XSL Stylesheets V1.65.1" >
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=======
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< link rel = "home" href = "../../../../index.html" title = "Chapter >
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=======
< link rel = "home" href = "../../../../index.html" title = "Chapter 1. Fusion 2.0" >
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< link rel = "up" href = "../comparison.html" title = "Comparison" >
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< link rel = "previous" href = "../comparison.html" title = "Comparison" >
< link rel = "next" href = "not_equal.html" title = "not
equal" >
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</ head >
< body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" >
< table cellpadding = "2" width = "100%" >< tr >
< td valign = "top" >< img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../../../boost.png" ></ td >
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< td align = "center" >< a href = "../../../../../../../../index.html" > Home</ a ></ td >
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< td align = "center" >< a href = "../../../../../../../libraries.htm" > Libraries</ a ></ td >
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< td align = "center" >< a href = "../../../../../../../../more/index.htm" > More</ a ></ td >
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< a accesskey = "p" href = "../comparison.html" >< img src = "../../../../../../../../doc/html/images/prev.png" alt = "Prev" ></ a >< a accesskey = "u" href = "../comparison.html" >< img src = "../../../../../../../../doc/html/images/up.png" alt = "Up" ></ a >< a accesskey = "h" href = "../../../../index.html" >< img src = "../../../../../../../../doc/html/images/home.png" alt = "Home" ></ a >< a accesskey = "n" href = "not_equal.html" >< img src = "../../../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
</ div >
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< div class = "section" lang = "en" >
< div class = "titlepage" >
< div >< div >< h5 class = "title" >
< a name = "fusion.sequence.operator.comparison.equal" ></ a >< a href = "equal.html" title = "equal" > equal</ a >
</ h5 ></ div ></ div >
< div ></ div >
</ div >
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< a name = "fusion.sequence.operator.comparison.equal.description" ></ a >< h6 >
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< a name = "id472785" ></ a >
< a href = "equal.html#fusion.sequence.operator.comparison.equal.description" > Description</ a >
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< a class = "link" href = "equal.html#fusion.sequence.operator.comparison.equal.description" > Description</ a >
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</ h6 >
< p >
Compare two sequences for equality.
</ p >
< a name = "fusion.sequence.operator.comparison.equal.synopsis" ></ a >< h6 >
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< a name = "id472815" ></ a >
< a href = "equal.html#fusion.sequence.operator.comparison.equal.synopsis" > Synopsis</ a >
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< a class = "link" href = "equal.html#fusion.sequence.operator.comparison.equal.synopsis" > Synopsis</ a >
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</ h6 >
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< pre class = "programlisting" >< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > Seq1</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > Seq2</ span >< span class = "special" > > </ span >
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< span class = "keyword" > bool</ span >
< span class = "keyword" > operator</ span >< span class = "special" > ==(</ span >< span class = "identifier" > Seq1</ span > < span class = "keyword" > const</ span >< span class = "special" > & </ span > < span class = "identifier" > a</ span >< span class = "special" > ,</ span > < span class = "identifier" > Seq2</ span > < span class = "keyword" > const</ span >< span class = "special" > & </ span > < span class = "identifier" > b</ span >< span class = "special" > );</ span >
</ pre >
< a name = "fusion.sequence.operator.comparison.equal.parameters" ></ a >< h6 >
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< a name = "id472966" ></ a >
< a href = "equal.html#fusion.sequence.operator.comparison.equal.parameters" > Parameters</ a >
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< a class = "link" href = "equal.html#fusion.sequence.operator.comparison.equal.parameters" > Parameters</ a >
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</ h6 >
< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
< col >
</ colgroup >
< thead >< tr >
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< th >< p >
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Parameter
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</ p ></ th >
< th >< p >
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Requirement
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</ p ></ th >
< th >< p >
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Description
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</ p ></ th >
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</ tr ></ thead >
< tbody >< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > a</ span >< span class = "special" > ,</ span >
< span class = "identifier" > b</ span ></ tt >
</ p ></ td >
< td >< p >
Instances of < a href = "../../../sequence.html" title = "Sequence" > Sequence</ a >
</ p ></ td >
< td >< p >
< a href = "../../../sequence.html" title = "Sequence" > Sequence</ a > (s) to compare
</ p ></ td >
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</ tr ></ tbody >
</ table ></ div >
< a name = "fusion.sequence.operator.comparison.equal.expression_semantics" ></ a >< h6 >
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< a name = "id473097" ></ a >
< a href = "equal.html#fusion.sequence.operator.comparison.equal.expression_semantics" > Expression
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< a class = "link" href = "equal.html#fusion.sequence.operator.comparison.equal.expression_semantics" > Expression
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Semantics</ a >
</ h6 >
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< pre class = "programlisting" >< span class = "identifier" > a</ span > < span class = "special" > ==</ span > < span class = "identifier" > b</ span >
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</ pre >
< p >
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< span class = "bold" >< b > Return type</ b ></ span > : < tt class = "computeroutput" >< span class = "keyword" > bool</ span ></ tt >
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</ p >
< p >
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< span class = "bold" >< b > Requirements</ b ></ span > :
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</ p >
< p >
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For each element, < tt class = "computeroutput" >< span class = "identifier" > e1</ span ></ tt > ,
in sequence < tt class = "computeroutput" >< span class = "identifier" > a</ span ></ tt > , and for
each element, < tt class = "computeroutput" >< span class = "identifier" > e2</ span ></ tt > , in
sequence < tt class = "computeroutput" >< span class = "identifier" > b</ span ></ tt > , < tt class = "computeroutput" >< span class = "identifier" > a</ span > < span class = "special" > ==</ span > < span class = "identifier" > b</ span ></ tt > is a valid expression returning a
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type that is convertible to bool.
</ p >
< p >
An attempt to compare two Sequences of different lengths results in a
compile time error.
</ p >
< p >
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< span class = "bold" >< b > Semantics</ b ></ span > :
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</ p >
< p >
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For each element, < tt class = "computeroutput" >< span class = "identifier" > e1</ span ></ tt > ,
in sequence < tt class = "computeroutput" >< span class = "identifier" > a</ span ></ tt > , and for
each element, < tt class = "computeroutput" >< span class = "identifier" > e2</ span ></ tt > , in
sequence < tt class = "computeroutput" >< span class = "identifier" > b</ span ></ tt > , < tt class = "computeroutput" >< span class = "identifier" > e1</ span > < span class = "special" > ==</ span > < span class = "identifier" > e2</ span ></ tt > returns true. For any 2 zero length
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< span class = "underline" > _sequence</ span > _s, e and f, e == f returns
true.
</ p >
< a name = "fusion.sequence.operator.comparison.equal.header" ></ a >< h6 >
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< a name = "id473355" ></ a >
< a href = "equal.html#fusion.sequence.operator.comparison.equal.header" > Header</ a >
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< a class = "link" href = "equal.html#fusion.sequence.operator.comparison.equal.header" > Header</ a >
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</ h6 >
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< pre class = "programlisting" >< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > sequence</ span >< span class = "special" > /</ span >< span class = "identifier" > comparison</ span >< span class = "special" > /</ span >< span class = "identifier" > equal_to</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
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< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > include</ span >< span class = "special" > /</ span >< span class = "identifier" > equal_to</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
< a name = "fusion.sequence.operator.comparison.equal.example" ></ a >< h6 >
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< a href = "equal.html#fusion.sequence.operator.comparison.equal.example" > Example</ a >
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< a class = "link" href = "equal.html#fusion.sequence.operator.comparison.equal.example" > Example</ a >
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</ h6 >
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< pre class = "programlisting" >< a href = "../../../container/vector.html" title = "vector" >< tt class = "computeroutput" >< span class = "identifier" > vector</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "keyword" > char</ span >< span class = "special" > > </ span > < span class = "identifier" > v1</ span >< span class = "special" > (</ span >< span class = "number" > 5</ span >< span class = "special" > ,</ span > < span class = "char" > 'a'</ span >< span class = "special" > );</ span >
< a href = "../../../container/vector.html" title = "vector" >< tt class = "computeroutput" >< span class = "identifier" > vector</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "keyword" > char</ span >< span class = "special" > > </ span > < span class = "identifier" > v2</ span >< span class = "special" > (</ span >< span class = "number" > 5</ span >< span class = "special" > ,</ span > < span class = "char" > 'a'</ span >< span class = "special" > );</ span >
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< span class = "identifier" > assert</ span >< span class = "special" > (</ span >< span class = "identifier" > v1</ span > < span class = "special" > ==</ span > < span class = "identifier" > v2</ span >< span class = "special" > );</ span >
</ pre >
</ div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" >< tr >
< td align = "left" ></ td >
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< td align = "right" >< div class = "copyright-footer" > Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt</ a > )
</ p >
</ div ></ td >
</ tr ></ table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "../comparison.html" >< img src = "../../../../../../../../doc/html/images/prev.png" alt = "Prev" ></ a >< a accesskey = "u" href = "../comparison.html" >< img src = "../../../../../../../../doc/html/images/up.png" alt = "Up" ></ a >< a accesskey = "h" href = "../../../../index.html" >< img src = "../../../../../../../../doc/html/images/home.png" alt = "Home" ></ a >< a accesskey = "n" href = "not_equal.html" >< img src = "../../../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
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