R-value: Difference between revisions
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{{wiktionary|r-value|rvalue}} |
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'''R-value''' or '''rvalue''' may refer to: |
'''R-value''' or '''rvalue''' may refer to: |
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* In computer science, a data value of a variable stored at some location in memory |
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* [[R-value (insulation)]] in building engineering, the efficiency of insulation of a house |
* [[R-value (insulation)]] in building engineering, the efficiency of insulation of a house |
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* [[R-value (soils)]] in geotechnical engineering, the stability of soils and aggregates for pavement construction |
* [[R-value (soils)]] in geotechnical engineering, the stability of soils and aggregates for pavement construction |
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* [[R-factor (crystallography)]], a measure of the agreement between the crystallographic model and the diffraction data |
* [[R-factor (crystallography)]], a measure of the agreement between the crystallographic model and the diffraction data |
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* ''R''<sub>0</sub> or ''R'' number, the [[basic reproduction number]] in epidemiology |
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* In statistics, the [[Pearson product-moment correlation coefficient]], or simply ''correlation coefficient'' |
* In statistics, the [[Pearson product-moment correlation coefficient]], or simply ''correlation coefficient'' |
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* In ophthalmic optics, the distance between the segment optical center and the segment top |
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* In solid mechanics, the [[Lankford coefficient]] |
* In solid mechanics, the [[Lankford coefficient]] |
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== Programming == |
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=== [http://en.wikipedia.org/wiki/C++11 C++0x] Move Semantics === |
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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"> |
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//examble: |
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class Object {}; |
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Object a; |
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Object b; |
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Object c; |
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c = a + b; |
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</syntaxhighlight>in above sample "a" and "b" are stored automatically in invisible object called "rvalue". |
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below we try to show it:<syntaxhighlight lang="cpp"> |
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Object a; |
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Object b; |
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Object c; |
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{ //start brace |
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Object rvalue = a.operator+( b ); |
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c = rvalue; |
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} //end brace removes rvalue |
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</syntaxhighlight> |
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== See also == |
== See also == |
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* [[R rating (disambiguation)]] |
* [[R rating (disambiguation)]] |
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* [[R-factor]], a plasmid that codes for antibiotic resistance |
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* [[List of refrigerants#Numbering scheme|ASHRAE refrigerant designations]], commonly known as R-numbers |
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{{ |
{{disambiguation}} |
Latest revision as of 15:04, 21 March 2024
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