#rvalues

[intercal]

anyway I finally understand C fanboys now, you can just ... read it. Unlike C++

[stellrrinsulation]

The truth about fixing your crawlspace insulation! https://t.co/5J5XA9y7Mi #insulation #sprayfoam #insulationremoval #crawlspaceinsulation #wallinsulation #stellrr #sprayfoaminsulation #Austin #rvalue #dehumidifier #insulationcontractor #remodeling

The truth about fixing your crawlspace insulation! https://t.co/5J5XA9y7Mi #insulation #sprayfoam #insulationremoval #crawlspaceinsulation #wallinsulation #stellrr #sprayfoaminsulation #Austin #rvalue #dehumidifier #insulationcontractor #remodeling

— Stellrr Insulation (@stellrrinsulate) Mar 1, 2023

from Twitter https://twitter.com/stellrrinsulate

[jtleepp]

lvalues and rvalues

The topic that inspired me to create this page, lvalues and rvalues. These rs and ls stand for left and right, referring to the side of in an assignment that value would be expected to occur.

A lvalue is a variable. You would expect this to live in the heap or stack, and it's address should be viewable with the reference of unary operator (&).

On the other hand (side of the expression), a rvalue is easiest to think of as a literal. They do not have a memory address that can be stored. Literals are the example of this I gave, but return values of functions also fit this category. So I guess that means they live in the stack or text? Seems odd to me.

Anyway, the real question is why are these useful. And it's because you can overload functions to handle these cases separately. probably other reasons as well. If you are writing a sorting function that doesn't want to modify the array passed to it, but you could increase efficiency if you did, you know with a rvalue you can modify the array in-place. Neat.

Now the function that sent me down this rabbit hole, std::move. Gotta go figure out what it does.

[bencplu]

読書メモ「c++初心者からの脱出」1

グローバル関数とメンバ関数

非公開メンバ変数にアクセスしなければメンバ関数にする必要はない

むやみやたらにオーバーロードしない

別名関数でよければそうする

const関数とは？

const関数は

void func() const｛処理｝

というように

メンバ関数名の後にconst関数を付加する。

const関数は、関数内でメンバ変数の値を変更できない

const lvalue参照とrvalue参照

まだよく理解できておらず…次回

[suegreene]

[Download PDF/Epub] Effective Modern C++: 42 Specific Ways to Improve Your Use of C++11 and C++14 - Scott Meyers

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 Coming to grips with C++11 and C++14 is more than a matter of familiarizing yourself with the features they introduce (e.g., auto type declarations, move semantics, lambda expressions, and concurrency support). The challenge is learning to use those features effectively--so that your software is correct, efficient, maintainable, and portable. That's where this practical book comes in. It describes how to write truly great software using C++11 and C++14--i.e. using modern C++.Topics include:The pros and cons of braced initialization, noexcept specifications, perfect forwarding, and smart pointer make functionsThe relationships among std:: move, std:: forward, rvalue references, and universal referencesTechniques for writing clear, correct, effective lambda expressionsHow std:: atomic differs from volatile, how each should be used, and how they relate to C++'s concurrency APIHow best practices in old C++ programming (i.e., C++98) require revision for software development in modern

[bananabarn]

Gnu octave interpreter

#GNU OCTAVE INTERPRETER SOFTWARE#

#GNU OCTAVE INTERPRETER CODE#

#GNU OCTAVE INTERPRETER PC#

#GNU OCTAVE INTERPRETER FREE#

I attach the results of exercising the testsuite with both compilers. I have recompiled Octave 7.0.90 on Debian sid armel, with ASAN, and with both GCC and Clang. libinterp/parse-tree/pt-select.h:279Īnd it is reproduciable 100% of few tries I had. #8 0xf61f357c in octave::tree_switch_command::accept(octave::tree_walker&). #7 0xf61629fc in octave::tree_evaluator::visit_switch_command(octave::tree_switch_command&). #6 0xf5a2628c in octave::tree_statement_list::accept(octave::tree_walker&). #5 0xf6161f14 in octave::tree_evaluator::visit_statement_list(octave::tree_statement_list&). #4 0xf61f7c80 in octave::tree_statement::accept(octave::tree_walker&). #3 0xf6161a28 in octave::tree_evaluator::visit_statement(octave::tree_statement&). /././src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:9986 #0 0xf770d6b8 in _interceptor_sigaltstack.

#GNU OCTAVE INTERPRETER PC#

=459233=ERROR: AddressSanitizer: stack-use-after-scope on address 0xffb9db3c at pc 0xf770d6bc bp 0xffb9db14 sp 0xffb9d6e8 Whats_she_telling_me = (isprime(num)) ? "prime & true" : "composite & false"Īnd I was sure, I must have been one of the few to run Octave on drugs.I got one almost right away at liboctave/array/-tst Printf("octave %s reached version 3.0 ", strncmp( version ,"3",1) ? "has" : "hasn't" ) % test cases for the new ternary operator The outcome of this experiment was pretty much fun, and I got a tour of the Octave sources, while running Octave-code like this,

#GNU OCTAVE INTERPRETER CODE#

As ususal the code is GPL'ed, and derives heavily on JWE's code. For the brave hearted, the code is posted here. The whole "operator" is implemented simply within the rvalue() member function.įinally, adding touches to the makefiles, and regenerating the whole scripts, we can run and compile the code. Tree_ternary_expression::accept (tree_walker& tw) = new tree_ternary_expression (op_cond? op_cond->dup(sym_tab) : 0 , Tree_ternary_expression::dup (symbol_table *sym_tab) Return octave_value::ternary_op_as_string (etype) Tree_ternary_expression::oper (void) const ::error ("evaluating ternary operator `%s' near line %d, column %d", Tree_ternary_expression::eval_error (void) is this where the "interpreter" executes the real thing.Įlse if (a.is_defined () & op_lhs & op_rhs ) is rvalue the value of the actual expression? Tree_ternary_expression::rvalue (int nargout)Įrror ("ternary operator `%s': invalid number of output arguments", You should have received a copy of the GNU General Public LicenseĪlong with Octave see the file COPYING. Octave is distributed in the hope that it will be useful, but WITHOUTĪNY WARRANTY without even the implied warranty of MERCHANTABILITY orįITNESS FOR A PARTICULAR PURPOSE.

#GNU OCTAVE INTERPRETER SOFTWARE#

Under the terms of the GNU General Public License as published by theįree Software Foundation either version 3 of the License, or (at your

#GNU OCTAVE INTERPRETER FREE#

Octave is free software you can redistribute it and/or modify it Tree_ternary_expression (const tree_ternary_expression&) Tree_expression *dup (symbol_table *sym_tab) Next the real token returning rule section of the lexer has the matching code Then we have a macro defined on lines of BIN_OP_RETURN(), as TERN_OP_RETURN(). I added the '?' token, as QUESTION_TERNOP, to the lex.l lexer file. This was serious, until I noticed an empty statement rule in the parser that fixed the ternary operator worked well! The details are minor functions in the spirit of the rest of the evaluator.Īfter compiling the whole thing, it worked but my parser rules were a little off, and the parse errors were not reported. Finally, I had to put in place the parse-tree class for ternary oeprator, and fill in Octave specific details. I had to add a few lines to the lexer tokens, and a single rule for the parser. This was quite experimental, but not very difficult to do. The '?' operator, has a grammar that evaluates to an expression The well known C-language '?' operator, is what I wanted to build into Octave. Like in the earlier blog post, I tried building a ternary operator into Octave.

[arahovsepyan]

View this post on Instagram

A post shared by Ara Hovsepyan, Architect (@arahovsepyan)

spit some bars about R-Values and U-Values... hit the link for the full vid! _________________________________ #rvalues #uvalues #architecture #architect #mnemonicdevice #architectrapper #architecturerap #thearchitectsmixtape #superarchitects #archinect #architectregistrationexam #ncarb #notly #ppd #pdd #buildingscience #buildingsciencefightclub #buildingscience101 #buildingsystems #energycalcs #title24 https://www.instagram.com/p/CCYsR1tpX79/?igshid=194ytoh2fjfvq

[jimsjoo]

error: lvalue required as increment

error: lvalue required as increment

What will be the value of x in the following C++ program? #include<iostream> using namespace std; int main(){ int aaa=1; int xxx=(aaa++)++; cout<< xxx <<endl; return 0; } The variable 'aaa' has 1 at first. When declared as an integer variable, xxx seems to have 3 because we are likely to assume that (aaa++) increases 'aaa' by 1 to make it 2 and '++' after (aaa++) makes the result of (aaa++)…

[intercal]

I'm gonna teach my kids what an rvalue reference is so they won't have the same struggles as me

[stellrrinsulation]

The 6 most popular attic insulation options around Austin TX. https://t.co/sQKebemVaR #atticinsulation #sprayfoam #insulationremoval #cellulose #fiberglass #stellrr #sprayfoaminsulation #Austin #rvalue #insulationcontractor #blowninsulation

The 6 most popular attic insulation options around Austin TX. https://t.co/sQKebemVaR #atticinsulation #sprayfoam #insulationremoval #cellulose #fiberglass #stellrr #sprayfoaminsulation #Austin #rvalue #insulationcontractor #blowninsulation

— Stellrr Insulation (@stellrrinsulate) Apr 14, 2023

from Twitter https://twitter.com/stellrrinsulate

[sidnazpro2020]

Latest News Today - India Coronavirus Cases: India's 'R-Value' Inching Up,

Latest News Today – India Coronavirus Cases: India’s ‘R-Value’ Inching Up,

India has logged over 3.16 crore cases since the start of the pandemic. New Delhi: India’s ‘R-Value’ is inching up, and it’s a cause of concern, AIIMS Chief Dr Randeep Guleria told NDTV on Saturday, stressing on the need of aggressive containment strategies in the parts of the country that are witnessing a surge in fresh Covid infections. His remarks come amid concern over a third…

[stuccoeverest]

Rooftop Stairwell Project Completed. ✅Flashing, Caulking and EIFS was done by us. Pleasure to work with QuadReal on this project.🏗🏢 #eifs #stucco #quadreal #propertymanagement #flashing #caulking #retrofit #renovation #exteriordesign #exterior #construction #architecture #generalcontractor #airbarrier #insulation #capflashing #rvalue (at Mississauga, Ontario) https://www.instagram.com/p/CMAM7bZDBSZ/?igshid=4aytns9dkxeo

[zebrablinds-ca]

New Post has been published on https://www.zebrablinds.ca/blog/how-to-get-the-best-r-value-for-your-windows-10-2020-44/

How to Get the Best R-Value for Your Windows

[jr3hp-blog]

Some in progress and completion shots of an attic air sealing and insulation repair job. What was thought to be R30 was performing at about an R5. This is in a young subdivision behind the #airnationalguard base near #schenectady Probably by a reputable developer..This home is only 17 years old but had several problems in the attic. I bet every other house in the subdivision could use the same repairs. Image 1: See the stink bug. We saw many of them near the air leakage points that are now sealed up. Guess how these pests can get into your home? Well not those buggers are not getting in this home anymore. Image 2: Insulation not in contact with the ceiling surface below it. Basically zero #rvalue if it’s not actually in contact with the air barrier(drywall ceiling). We placed it back down in contact and filled in the gaps with loose fill #blowninsulation Image 3: Attic knee-wall showing netting being placed up that will actually keep the vertical insulation in contact with the sheetrock. We packed some cellulose under the netting for a little extra r value and pack/push the insulation in contact with the sheetrock. Image 4 and 5: The finished product with just a dusting if cellulose. In this case it was 225 lbs of insulation. Mostly to just fill in gaps and get the R30 to actually perform as it should. Image 6: Cross sectional view of the attic hatch. There’s a layer of 1” and 2” foamboard for a total of R18. The trick to actually getting the R18 is the caulk seen in-between the layers. Small details critical for real results. #homeperformance #empowerny (at Glenville, New York) https://www.instagram.com/p/BwI9SL5Dvi0/?utm_source=ig_tumblr_share&igshid=11r9j7brgyks3

[intercal]

I think I am going to abandon C++ for writing this language. it was a nice idea, and maybe I bit off more than I could chew, but I don't think it's what I want to be using. often I will find myself getting annoyed-the-hell-out-of while I'm writing it, and this is supposed to be a fun project. it was not a big, specific thing that caused me to drop the language, but a combination of a lot of small things:

no lifetime tracking, which I can't really complain about because that's the language. but it's still very annoying having to worry about getting a reference to something, releasing that reference, and then taking it again in case its position in memory had changed.

implicit integer narrowing was probably what caused me to stop. say you have a 16 bit integer, and you accidentally try to shove it into an 8 bit argument (which I was starting to run into). it will happily chop off the top 8 bits and compile your program without telling you.

incomplete implementations of the current standard. C++23 was finalized last year, but gcc and ESPECIALLY clang (holy fuck they are so behind) have huge chunks missing.

the standard library feels really incomplete and not integrated with the rest of the language with its newest features. I was originally going to use std::u8string everywhere just to show that I plan on using utf-8 strings everywhere, but passing a u8string into anything doesn't seem to have much support in the standard library functions, probably because it's so new. so why would anyone want to use it if it has zero support within the library it's defined in?

no native utf-8 support. I can live with this, but man it would be nice not having to pull a new library in for it.

having to think about lvalues, rvalues, glvalues, and so forth. I finally get why it's important in a language like this, but I would prefer to just ... not. lol

so yeah. I think I am going to shoot for using Rust. I hope I do not rue the day. it has its own annoying shit with pointers and memory but I hope that I can just ignore that for a while, considering I was going to ignore it for a while in C++. I'm a lot more familiar with Rust too and its pitfalls. my main worry is that I have had multiple projects completely stopped in their tracks because I made an incorrect assumption and it completely ruined my design. hopefully this won't happen since I'm just porting stuff over, but we will see.

[stellrrinsulation]

Adding attic insulation is a waste of money! Here is how to fix it right! https://t.co/XRhN1fQUGD #atticinsulation #sprayfoam #insulationremoval #cellulose #fiberglass #stellrr #sprayfoaminsulation #Austin #rvalue #insulationcontractor #insulationvacuum #atticinsulationaustin

Adding attic insulation is a waste of money! Here is how to fix it right! https://t.co/XRhN1fQUGD #atticinsulation #sprayfoam #insulationremoval #cellulose #fiberglass #stellrr #sprayfoaminsulation #Austin #rvalue #insulationcontractor #insulationvacuum #atticinsulationaustin

— Stellrr Insulation (@stellrrinsulate) Apr 5, 2023

from Twitter https://twitter.com/stellrrinsulate