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<!DOCTYPE html><html lang='en'><head><title>[qty.unit.concepts]</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 and units library <a class='abbr_ref' href='index.html#quantities'>[quantities]</a></h1><h2 ><a class='secnum' style='min-width:65pt'>5.4</a> Reference <a class='abbr_ref' href='qty.ref.html#qty.unit.concepts'>[qty.ref]</a></h2><h3 ><a class='secnum' style='min-width:80pt'>5.4.4</a> Unit <a class='abbr_ref' href='qty.unit.html#concepts'>[qty.unit]</a></h3><h4 ><a class='secnum' style='min-width:95pt'>5.4.4.4</a> Concepts <a class='abbr_ref'>[qty.unit.concepts]</a></h4><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> T<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <a class='hidden_link' href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='concept:Unit'><span id='lib:Unit'><span class='texttt'>Unit</span></span></span></a> <span class='operator'>=</span> <a class='index' id='conceptref:SymbolicConstant'></a><span class='texttt'><i >SymbolicConstant</i></span><span class='anglebracket'><</span>T<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> std<span class='operator'>::</span>derived_from<span class='anglebracket'><</span>T, <span class='texttt'><i >unit-interface</i></span><span class='anglebracket'>></span>;
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>typename</span> T<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <a class='hidden_link' href='#concept:PrefixableUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='concept:PrefixableUnit'><span id='lib:PrefixableUnit'><span class='texttt'>PrefixableUnit</span></span></span></a> <span class='operator'>=</span> <a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span>T<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <span class='texttt'><i >is-derived-from-specialization-of</i></span><span class='anglebracket'><</span>T, named_unit<span class='anglebracket'>></span><span class='parenthesis'>(</span><span class='parenthesis'>)</span>;
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>typename</span> T<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <a class='hidden_link' href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='concept:AssociatedUnit'><span id='lib:AssociatedUnit'><span class='texttt'>AssociatedUnit</span></span></span></a> <span class='operator'>=</span> <a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit_'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span>U<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <span class='texttt'><i >has-associated-quantity</i></span><span class='parenthesis'>(</span>U<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='parenthesis'>)</span>;
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>typename</span> U, <span class='keyword'>auto</span> QS<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <a class='hidden_link' href='#concept:UnitOf' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='concept:UnitOf'><span id='lib:UnitOf'><span class='texttt'>UnitOf</span></span></span></a> <span class='operator'>=</span> <a href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:AssociatedUnit'><span class='texttt'>AssociatedUnit</span></span></a><span class='anglebracket'><</span>U<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <a href='qty.spec.concepts.html#concept:QuantitySpec' title='5.4.3.2 Concepts [qty.spec.concepts]'><span id='conceptref:QuantitySpec'><span class='texttt'>QuantitySpec</span></span></a><span class='anglebracket'><</span><span class='keyword'>decltype</span><span class='parenthesis'>(</span>QS<span class='parenthesis'>)</span><span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span>
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<a class='index' id='conceptref:QuantitySpecConvertibleTo'></a><span class='texttt'><i >QuantitySpecConvertibleTo</i></span><span class='anglebracket'><</span>get_quantity_spec<span class='parenthesis'>(</span>U<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='parenthesis'>)</span>, QS<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span>
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<span class='parenthesis'>(</span>get_kind<span class='parenthesis'>(</span>QS<span class='parenthesis'>)</span> <span class='operator'>=</span><span class='operator'>=</span> get_kind<span class='parenthesis'>(</span>get_quantity_spec<span class='parenthesis'>(</span>U<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='parenthesis'>)</span><span class='parenthesis'>)</span> <span class='operator'>|</span><span class='operator'>|</span>
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<span class='operator'>!</span><a class='index' id='conceptref:NestedQuantityKindSpecOf'></a><span class='texttt'><i >NestedQuantityKindSpecOf</i></span><span class='anglebracket'><</span>get_quantity_spec<span class='parenthesis'>(</span>U<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='parenthesis'>)</span>, QS<span class='anglebracket'>></span><span class='parenthesis'>)</span>;
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>auto</span> From, <span class='keyword'>auto</span> To<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <span class='texttt'><i >UnitConvertibleTo</i></span><a class='index' id='concept:UnitConvertibleTo'></a> <span class='operator'>=</span> <span class='comment'>// <i >exposition only</i></span>
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<a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit__'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span><span class='keyword'>decltype</span><span class='parenthesis'>(</span>From<span class='parenthesis'>)</span><span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit___'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span><span class='keyword'>decltype</span><span class='parenthesis'>(</span>To<span class='parenthesis'>)</span><span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <span class='parenthesis'>(</span>convertible<span class='parenthesis'>(</span>From, To<span class='parenthesis'>)</span><span class='parenthesis'>)</span>;
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>typename</span> U, <span class='keyword'>auto</span> FromU, <span class='keyword'>auto</span> QS<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <span class='texttt'><i >UnitCompatibleWith</i></span><a class='index' id='concept:UnitCompatibleWith'></a> <span class='operator'>=</span> <span class='comment'>// <i >exposition only</i></span>
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<a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit____'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span>U<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit_____'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span><span class='keyword'>decltype</span><span class='parenthesis'>(</span>FromU<span class='parenthesis'>)</span><span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <a href='qty.spec.concepts.html#concept:QuantitySpec' title='5.4.3.2 Concepts [qty.spec.concepts]'><span id='conceptref:QuantitySpec_'><span class='texttt'>QuantitySpec</span></span></a><span class='anglebracket'><</span><span class='keyword'>decltype</span><span class='parenthesis'>(</span>QS<span class='parenthesis'>)</span><span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span>
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<span class='parenthesis'>(</span><span class='operator'>!</span><a href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:AssociatedUnit_'><span class='texttt'>AssociatedUnit</span></span></a><span class='anglebracket'><</span>U<span class='anglebracket'>></span> <span class='operator'>|</span><span class='operator'>|</span> <a href='#concept:UnitOf' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:UnitOf'><span class='texttt'>UnitOf</span></span></a><span class='anglebracket'><</span>U, QS<span class='anglebracket'>></span><span class='parenthesis'>)</span> <span class='operator'>&</span><span class='operator'>&</span> <a class='index' id='conceptref:UnitConvertibleTo'></a><span class='texttt'><i >UnitConvertibleTo</i></span><span class='anglebracket'><</span>FromU, U<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='anglebracket'>></span>;
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>typename</span> T<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <span class='texttt'><i >OffsetUnit</i></span><a class='index' id='concept:OffsetUnit'></a> <span class='operator'>=</span> <a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit______'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span>T<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <span class='keyword'>requires</span> <span class='curlybracket'>{</span> T<span class='operator'>::</span><span class='texttt'><i >point-origin</i></span>; <span class='curlybracket'>}</span>; <span class='comment'>// <i >exposition only</i></span>
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<span class='keyword'>template</span><span class='anglebracket'><</span><span class='keyword'>typename</span> From, <span class='keyword'>typename</span> To<span class='anglebracket'>></span>
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<span class='keyword'>concept</span> <span class='texttt'><i >PotentiallyConvertibleTo</i></span><a class='index' id='concept:PotentiallyConvertibleTo'></a> <span class='operator'>=</span> <span class='comment'>// <i >exposition only</i></span>
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<a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit_______'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span>From<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <a href='#concept:Unit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:Unit________'><span class='texttt'>Unit</span></span></a><span class='anglebracket'><</span>To<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span>
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<span class='parenthesis'>(</span><span class='parenthesis'>(</span><a href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:AssociatedUnit__'><span class='texttt'>AssociatedUnit</span></span></a><span class='anglebracket'><</span>From<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <a href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:AssociatedUnit___'><span class='texttt'>AssociatedUnit</span></span></a><span class='anglebracket'><</span>To<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span>
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implicitly_convertible<span class='parenthesis'>(</span>get_quantity_spec<span class='parenthesis'>(</span>From<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='parenthesis'>)</span>, get_quantity_spec<span class='parenthesis'>(</span>To<span class='curlybracket'>{</span><span class='curlybracket'>}</span><span class='parenthesis'>)</span><span class='parenthesis'>)</span><span class='parenthesis'>)</span> <span class='operator'>|</span><span class='operator'>|</span>
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<span class='parenthesis'>(</span><span class='operator'>!</span><a href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:AssociatedUnit____'><span class='texttt'>AssociatedUnit</span></span></a><span class='anglebracket'><</span>From<span class='anglebracket'>></span> <span class='operator'>&</span><span class='operator'>&</span> <span class='operator'>!</span><a href='#concept:AssociatedUnit' title='5.4.4.4 Concepts [qty.unit.concepts]'><span id='conceptref:AssociatedUnit_____'><span class='texttt'>AssociatedUnit</span></span></a><span class='anglebracket'><</span>To<span class='anglebracket'>></span><span class='parenthesis'>)</span><span class='parenthesis'>)</span>;
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</code></div></div></div></body></html> |