R-value: Difference between revisions

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R-value or rvalue may refer to:

R-value (insulation) in building engineering, the efficiency of insulation of a house
R-value (soils) in geotechnical engineering, the stability of soils and aggregates for pavement construction
R-factor (crystallography), a measure of the agreement between the crystallographic model and the diffraction data
R₀ or R number, the basic reproduction number in epidemiology
In computer science, a pure value which cannot be assigned to
In statistics, the Pearson product-moment correlation coefficient, or simply correlation coefficient
In solid mechanics, the Lankford coefficient

See also[edit]

L-value (disambiguation)
R rating (disambiguation)
R-factor, a plasmid that codes for antibiotic resistance
ASHRAE refrigerant designations, commonly known as R-numbers

This disambiguation page lists articles associated with the title R-value.
If an internal link led you here, you may wish to change the link to point directly to the intended article.

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+{{wiktionary|r-value|rvalue}}
 '''R-value''' or '''rvalue''' may refer to:
-* In computer science, a [[value (computer science)#lrvalue|value]] considered independently of its storage location
-* In computer science, a data value of a variable stored at some location in memory
 * [[R-value (insulation)]] in building engineering, the efficiency of insulation of a house
 * [[R-value (soils)]] in geotechnical engineering, the stability of soils and aggregates for pavement construction
 * [[R-factor (crystallography)]], a measure of the agreement between the crystallographic model and the diffraction data
+* ''R''<sub>0</sub> or ''R'' number, the [[basic reproduction number]] in epidemiology
+* In computer science, a [[value (computer science)#lrvalue|pure value which cannot be assigned to]]
 * In statistics, the [[Pearson product-moment correlation coefficient]], or simply ''correlation coefficient''
-* In ophthalmic optics, the distance between the segment optical center and the segment top
 * In solid mechanics, the [[Lankford coefficient]]
-==  Programming ==
-=== [[C++11|C++0x]] Move Semantics ===
-rvalues denote temporary objects which are destroyed at the next semicolon (to be more precise: at the end of the full-expression that lexically contains the rvalue)<syntaxhighlight lang="cpp">
-//examble:
-class Object {};
-Object a;
-Object b;
-Object c;
-c = a + b;
-</syntaxhighlight>in above sample "a" and "b" are stored automatically in invisible object called "rvalue".
-below we try to show it:<syntaxhighlight lang="cpp">
-Object a;
-Object b;
-Object c;
-{ //start brace
-    Object rvalue = a.operator+( b );
-    c = rvalue;
-} //end brace removes rvalue
-</syntaxhighlight>
 == See also ==
+* [[L-value (disambiguation)]]
 * [[R rating (disambiguation)]]
+* [[R-factor]], a plasmid that codes for antibiotic resistance
-* [[L-value (disambiguation)]]
+* [[List of refrigerants#Numbering scheme|ASHRAE refrigerant designations]], commonly known as R-numbers
-{{Disambig}}
+{{disambiguation}}