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<!DOCTYPE html> < html lang = 'en' >< head >< title > [qty.traits]</ 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' > 5</ a > Quantities library < a class = 'abbr_ref' href = 'index.html#qties' > [qties]</ a ></ h1 >< h2 >< a class = 'secnum' style = 'min-width:65pt' > 5.6</ a > Traits < a class = 'abbr_ref' > [qty.traits]</ a ></ h2 >< div class = 'texpara' >< div class = 'itemdecl' id = 'itemdecl:1' >< div class = 'marginalizedparent' >< a class = 'itemDeclLink' href = '#itemdecl:1' > 🔗</ a ></ div >< code class = 'itemdeclcode' >< span class = 'keyword' > template</ span >< span class = 'anglebracket' > < </ span >< span class = 'keyword' > typename</ span > Rep< span class = 'anglebracket' > > </ span >
< span class = 'keyword' > constexpr</ span > < span class = 'keyword' > bool</ span > < span id = 'lib:is_scalar' >< a class = 'hidden_link' href = '#lib:is_scalar' title = '5.6 Traits [qty.traits]' > is_scalar</ a ></ span > < span class = 'operator' > =</ span >
std< span class = 'operator' > ::</ span > is_floating_point_v< span class = 'anglebracket' > < </ span > Rep< span class = 'anglebracket' > > </ span > < span class = 'operator' > |</ span >< span class = 'operator' > |</ span > < span class = 'parenthesis' > (</ span > std< span class = 'operator' > ::</ span > is_integral_v< span class = 'anglebracket' > < </ span > Rep< span class = 'anglebracket' > > </ span > < span class = 'operator' > & </ span >< span class = 'operator' > & </ span > < span class = 'operator' > !</ span > is_same_v< span class = 'anglebracket' > < </ span > Rep, < span class = 'keyword' > bool</ span >< span class = 'anglebracket' > > </ span >< span class = 'parenthesis' > )</ span > ;
< span class = 'keyword' > template</ span >< span class = 'anglebracket' > < </ span >< span class = 'keyword' > typename</ span > Rep< span class = 'anglebracket' > > </ span >
< span class = 'keyword' > constexpr</ span > < span class = 'keyword' > bool</ span > < span id = 'lib:is_vector' >< a class = 'hidden_link' href = '#lib:is_vector' title = '5.6 Traits [qty.traits]' > is_vector</ a ></ span > < span class = 'operator' > =</ span > < span class = 'literal' > false</ span > ;
< span class = 'keyword' > template</ span >< span class = 'anglebracket' > < </ span >< span class = 'keyword' > typename</ span > Rep< span class = 'anglebracket' > > </ span >
< span class = 'keyword' > constexpr</ span > < span class = 'keyword' > bool</ span > < span id = 'lib:is_tensor' >< a class = 'hidden_link' href = '#lib:is_tensor' title = '5.6 Traits [qty.traits]' > is_tensor</ a ></ span > < span class = 'operator' > =</ span > < span class = 'literal' > false</ span > ;
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</ code ></ 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/mpusz/mp-units315e47c2573226a4fea735c0514806595d94ed6d/source/quantities.tex#L149' > #</ a ></ div >< div class = 'texpara' >< div id = '1.sentence-1' class = 'sentence' >< i > Remarks</ i > : Pursuant to < a href = "https://wg21.link/namespace.std" > N4971, [namespace.std]</ a > (< a href = 'spec.ext.html' title = '4.1 External' > [spec.< span class = 'shy' ></ span > ext]</ a > ),
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users may specialize < span class = 'texttt' > is_< span class = 'shy' ></ span > scalar</ span > , < span class = 'texttt' > is_< span class = 'shy' ></ span > vector</ span > , and < span class = 'texttt' > is_< span class = 'shy' ></ span > tensor</ span > to < span class = 'texttt' >< span class = 'literal' > true</ span ></ span >
for cv-unqualified program-defined types
which respectively represent
a scalar (< a href = "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=102-02-18" > IEC 60050, 102-02-18</ a > ),
a vector (< a href = "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=102-03-04" > IEC 60050, 102-03-04</ a > ), and
a tensor,
and < span class = 'texttt' >< span class = 'literal' > false</ span ></ span > for types which respectively do not< a class = 'hidden_link' href = '#1.sentence-1' > .</ a ></ div ></ div ></ div ></ div ></ div ></ body ></ html >
