R-value: Difference between revisions

Content deleted Content added

Inline

Revision as of 05:27, 7 February 2018

R-value or rvalue may refer to:

In computer science, a 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
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

@@ Line 8: / Line 8: @@
 * 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 ==