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# Topic: Rvalue

###### In the News (Wed 20 Jun 18)

 move proposal Treating "a" as an rvalue within f would lead to error prone code: First the "move version" of g() would be called, which would likely pilfer "a", and then the pilfered "a" would be sent to the move overload of h(). Introduction of the "rvalue reference" allows for the exception relating to temporaries and the implicit object parameter to be removed from the language (section 13.3.3.1.4 / 3). The rvalue reference must be overloadable with the lvalue reference (the current reference). www.open-std.org /jtc1/sc22/wg21/docs/papers/2002/n1377.htm   (6349 words)

 The Forwarding Problem: Arguments Another downside is that rvalues are forwarded as lvalues (a common trait of all presented solutions except #7). Many still consider forwarding an rvalue where it otherwise would be rejected unacceptable (C2), but this is still better than the options we have under the current language semantics. A perfect forwarding function would forward rvalue arguments as rvalues; none of the methods described so far achieve this, since it is not possible to determine from within a function whether an argument was an l- or an rvalue. www.open-std.org /jtc1/sc22/wg21/docs/papers/2002/n1385.htm   (2372 words)

 Embedded.com - Lvalues and Rvalues The C++ Standard does use the term rvalue, defining it indirectly with this sentence: "Every expression is either an lvalue or an rvalue." So an rvalue is any expression that is not an lvalue. Although lvalues and rvalues got their names from their roles in assignment expressions, the concepts apply in all expressions, even those involving other built-in operators. The assumption that rvalues do not refer to objects gives C and C++ compilers considerable freedom in generating code for rvalue expressions. www.embedded.com /showArticle.jhtml?articleID=9900167   (1536 words)

 RFC 107 (v1) lvalue subs should receive the rvalue as an argument Free discussion   (Site not responding. Last check: 2007-11-04) the rvalue being assigned to it as an argument. > > the rvalue being assigned to it as an argument. > > > the rvalue being assigned to it as an argument. www.qaix.com /perl-web-programming/166-863-rfc-107-v1-lvalue-subs-should-receive-the-rvalue-as-an-argument-read.shtml   (2602 words)

 [No title] The effect of the implicit conversion is the same as performing the declaration and initialization and then using the temporary variable as the result of the conversion. An rvalue of an integer type or of an enumeration type can be converted to an rvalue of a floating point type. A null pointer constant is an integral constant expression (5.19) rvalue of integer type that evaluates to zero. www.lcdf.org /c++/clause4.html   (1924 words)

 Thompson's B Manual The rvalue of the string is the lvalue of the object containing the first character. The operand of the negate prefix unary operator - is interpreted as an integer rvalue. The result is the rvalue either before or after the operation depending on postfix or prefix notation respectively. cm.bell-labs.com /cm/cs/who/dmr/kbman.html   (3811 words)

 lvalue subs should receive the rvalue as an argument - This RFC proposes that lvalue subs, when invoked as such, should receive the rvalue being assigned to it as an argument. It is proposed that lvalue subs should be called with the rvalue passed as a regular argument. We might want to consider a general rule stating that the rvalue is added to the end of any existing argument list. dev.perl.org /rfc/107.html   (461 words)

 Re: What exactly is lvalue & rvalue (old c.l.c. posts are all over the map)? Luke Wu wrote: > > When an lvalue is used in an "general object context," then the lvalue > is directly acted upon (no conversion to an rvalue takes place). Previous by thread: Re: What exactly is lvalue & rvalue (old c.l.c. Next by thread: Re: What exactly is lvalue & rvalue (old c.l.c. www.theone.ru /lists/comp.lang.c/msg10082.html   (158 words)

 Expressions You create an rvalue subcontext wherever you need to specify a test or value to the translator, determine an initial value prior to program startup or compute a value when the program executes. If you write an array lvalue expression in an rvalue subcontext, the translator converts the type array of T to pointer to T. The value of the expression is the address of the first element of the array. If you write a function-designator expression in an rvalue subcontext, the translator converts the type function returning T to pointer to function returning T. The value of the expression is the address of the function. www.siue.edu /~jweinbe/STD_C/express.html   (6374 words)

 rvalue reference Overload resolution rules prefer binding rvalues to rvalue references and lvalues to lvalue references. The result of casting an lvalue to an rvalue reference is treated as an rvalue. Declaring the third argument with an rvalue reference would allow clients to decide for themselves if the state of the random number generator after the shuffle is important to their program logic. www.open-std.org /jtc1/sc22/wg21/docs/papers/2004/n1690.html   (2461 words)

 C++ Programming: How to determind lvalue vs rvalue I want to be able to tell the difference between when an item in the vector is being assigned, and when it's being retrieved. The first is called for lvalue and the second for rvalue, not sure tho... So far, your code is the only one that compiles and works for rvalue vs lvalue. www.experts-exchange.com /Programming/Programming_Languages/Cplusplus/Q_20631238.html   (918 words)

 Re: RFC 107 (v1) lvalue subs should receive the rvalue as an argument Re: Make lvalue subs the default (was Re: RFC 107 (v1) lvalue subs should receive the rvalue as an argument) Nathan Torkington Re: Make lvalue subs the default (was Re: RFC 107 (v1) lvalue subs should receive the rvalue as an argument) Nathan Wiger Re: Make lvalue subs the default (was Re: RFC 107 (v1) lvalue subs should receive the rvalue as an argument) James Mastros www.mail-archive.com /perl6-language@perl.org/msg02298.html   (569 words)

 Make lvalue subs the default (was Re: RFC 107 (v1) lvalue subs should receive the rvalue as an arg Free discussion   (Site not responding. Last check: 2007-11-04) I think they should be both rvalue and lvalue at the same time. take the variable name the rvalue should be passed in. RFC, with the twist that the elements of @b are passed with a :rvalue qaix.com /perl-web-programming/166-877-make-lvalue-subs-the-default-was-re-rfc-107-v1-lvalue-subs-should-receive-the-rvalue-as-an-arg-read.shtml   (2631 words)

 Conditional Love: FOREACH Redux rvalues are more elusive; they are the unnamed temporary objects that flit into and out of existence as a result of operations, conversions and function calls. As a side-effect, it writes into the flag whether the expression is an rvalue or not. that displays "rvalue" for rvalue expressions, and "lvalue" for lvalue expressions. www.artima.com /cppsource/foreach3.html   (1350 words)

 C++ Programming: non const operator[] called by VC6 in rvalue context The fix: Return a proxy object that overloads the assignment operator to perform the copy-on-write operation and cast to char when used in an rvalue context (Chapter 11 of Stroustrup's _C++ Programming Language_ or RCBase template at bearcave: http://www.bearcave.com/software/string/doc/html/classRCBase.html). Obviously s2 in this example is the lvalue, while in your example s is the rvalue, but the compiler doesn't care if you are the r or l value, but rather if the object being manipulated is a constant object or not. Now of course if the object is const then the compiler won't let you call any non-const methods but if your object is non-const AND there exists a suitable non-const method then the non-const method will always be called. www.experts-exchange.com /Programming/Programming_Languages/Cplusplus/Q_20846131.html   (622 words)

 Re: rvalue or lvalue? Rvalues and lvalues are kinds of expression, not attributes of variables. Furthermore, you seem to have their meanings the wrong way round. An rvalue yields a value whereas an lvalue yields a reference to (at the machine level, an address of) an object or function. www.talkaboutprogramming.com /group/comp.lang.c++.moderated/messages/151790.html   (141 words)

 SDF Syntax   (Site not responding. Last check: 2007-11-04) Apart from allowing negative numbers (RNUMBER instead of NUMBER), an rtriple is essentially the same as a triple. The number of rvalues you can specify is limited to one, two, three, six or twelve. A complete discussion of the use of rvalue_list is included in "Specifying Delay Values" on page 3-17. www.vhdl.org /fmf/wwwpages/sdfbnf.html   (756 words)

 Re: RFC 107 (v1) lvalue subs should receive the rvalue as an argument Most of the time the current lvalue behaviour does pretty much the Right Thing, and simple lvalue subs are simple to write. If you end up with the rvalue as an extra argument you end up having to dance around whether or not the sub is called in an lvalue context to possibly decide what to do with the argument. Re: RFC 107 (v1) lvalue subs should receive the rvalue as an argument skud www.mail-archive.com /perl6-all@perl.org/msg00300.html   (520 words)

 chadr's skewed perspective : Are you an lvalue or an rvalue? Gretchen and Zoe, rvalue'd by Heather, recently assessed their visibility by googling some of the idioms in their world. One of these was, essentially, “what to wear to a Microsoft interview.“ They even suggested deferring to me to answer the question of what to wear with khakis. You're an rvalue, it means you have the real meaning and someone else copies it. blogs.msdn.com /chadroyal/archive/2004/05/12/130561.aspx   (1429 words)

 Bundled Detectors Description of the rValue that is the resources rValue concatenated with the rValue of its children from which it inherits. The Ip detector is used to monitor the status of an IP alias. If the child is a physical disk, the effective rValue does not contain the volume name. docsrv.sco.com /HAUserG/chap6.htm   (722 words)

 Re: Defining lvalue, rvalue, pointer and reference Re: Defining lvalue, rvalue, pointer and reference, "Adam H. Peterson" Re: Defining lvalue, rvalue, pointer and reference, James Dennett Re: Defining lvalue, rvalue, pointer and reference, David Abrahams www.usenet.com /newsgroups/comp.std.c++/msg00598.html   (508 words)

 NUI: nuiProperty.h Source File   (Site not responding. Last check: 2007-11-04) CFormat("%d",mValue); 00341 return str; 00342 } 00343 00344 bool nuiInt8::SetValue(const nglStringand rValue) 00345 { 00346 mValue = rValue. CFormat("%d",mValue); 00355 return str; 00356 } 00357 00358 bool nuiInt16::SetValue(const nglStringand rValue) 00359 { 00360 mValue = rValue. CFormat("%d",mValue); 00369 return str; 00370 } 00371 00372 bool nuiInt32::SetValue(const nglStringand rValue) 00373 { 00374 mValue = rValue. www.nongnu.org /ngl/doc/nui/nui_property_8h-source.html   (497 words)

 CC: Require assistance for evaluating the ?   (Site not responding. Last check: 2007-11-04) Reply: Andrew L Wendelborn: "Re: Require assistance for evaluating the ?" I am having problems evaluating the node for TypeChecks even after much thoughts. We need to verify if the is of equivalent to ? naaec.cs.adelaide.edu.au /hypermail/archives/CC/0057.html   (275 words)

 [No title] Then, we look at the variables % referenced on the RHS of the statement and see, for each one, if we can % replace it with a propogated value. If this can be done, it returns % this simpler rvalue and signals changed update_rvalue = proc (r: rvalue, whereDef: bitvec, defs: definitions) signals (changed (rvalue)) % First, make sure that the rvalue refers to a variable. If so, % look the variable up in whereDefTab and see if any definitions of % that variable reach this point. www.mit.edu /afs/sipb.mit.edu/user/ghudson/6.035/constprop.clu   (230 words)

 What exactly is lvalue & rvalue (old c.l.c. posts are all ov Groupsrv.com Topic Name : What exactly is lvalue & rvalue (old c.l.c. is directly acted upon (no conversion to an rvalue takes place). expression, the fact that rvalues can be operands too should forbit us www.groupsrv.com /computers/post-567708.html   (1050 words)

 ETreeVisitor (ELib API) Does a setValue on the slot named by varName to the value of rValue Eval left to right, then synchronously call the verb method of the value of recip with the values of the args. Neither patt nor rValue may use any variables defined by the other. www.erights.org /javadoc/org/erights/e/elang/visitors/ETreeVisitor.html   (766 words)

 Simkin for Java: Class RValue This function updates the current RValue with the type and value given This function returns the Java object whose value corresponds to that of the RValue but with the given type This function returns the Java class which corresponds to the type of the RValue www.simkin.co.uk /java/api/simkin/RValue.html   (713 words)

 [C++ dayly bug report] const_cast to rvalue of class type   (Site not responding. Last check: 2007-11-04) Subject: [C++ dayly bug report] const_cast to rvalue of class type EGCS/g++ happily accepts to const_cast to rvalues of class type. Re: [C++ dayly bug report] const_cast to rvalue of class type gcc.gnu.org /ml/gcc/1999-04n/msg01071.html   (146 words)

 LValue Example   (Site not responding. Last check: 2007-11-04) So depending on which side of an assignment, we use the variable We will have return types that are rvalue types, and return types that are lvalue types. uses the rvalue which is copied back as the value of this function. www.cs.ucsc.edu /~pohl/code/lvalue.htm   (275 words)

 Re: What exactly is lvalue & rvalue (old c.l.c. posts are all over the map)? Romeo Colacitti wrote: > > Hi, > > Does anyone here have a strong understanding for the meanings of the > terms "lvalue" and "rvalue" as it pertains to C, objects, and different > contexts? [...] The simplest way to think of them would probably be: An lvalue can go on the left of an assignment statement, and an rvalue can go on the right. Prev by Date: Re: What exactly is lvalue & rvalue (old c.l.c. www.theone.ru /lists/comp.lang.c/msg10130.html   (155 words)

 Boost mailing page: [boost] Re: runtime rvalue detection for Visual C++ 6.0 Previous message: Gennadiy Rozental: "[boost] Re: runtime rvalue detection for Visual C++ 6.0" In reply to: Peder Holt: "[boost] runtime rvalue detection for Visual C++ 6.0" You are assuming that an rvalue's address will always have the lists.boost.org /MailArchives/boost/msg79509.php   (253 words)

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