C++ - Reddit

Is there any static analyzer which warns on binding to a destructed reference? Is there any static analyzer which emit's a warning when a reference to a member of temporary (Base) is accessed as in the following code block? struct Member { int value{}; }; struct Base { auto getmember() const -> const Member& { return member; } Member member{}; }; auto makebase() { return Base{}; } auto testfunc() { const auto& member = makebase().getmember(); } I'm aware that there are cases where get_member() returns a reference to a valid objekt, so a address sanitizer is required to avoid false positives. But false positives aside, is there any static analyzer who at least issues a warning by looking at the signatures of the function chain? As a side note, Visual Studio Intellisense ironically suggests to add a broken reference: https://www.dropbox.com/s/3x0ukgoc05kpt12/intellisense.png?dl=0 https://redd.it/n4ljj5 @r_cpp

10 Best practices to design and implement a C++ class https://issamvb.medium.com/10-best-practices-to-design-and-implement-a-c-class-4326611827e1 https://redd.it/n4wkmj @r_cpp

C++ Project Question Hey so I am having a hard time figuring out how to start a program like this: "Develop a program which will read numbers from the keyboard into an array of type ‘int’. You may assume that there will be no more than 50 distinct (unique) entries in the array. Your program allows any number of numbers to be entered, but only 50 may be unique. The output is to be a two-column list. The first column is a list of the distinct number elements, the second column is the count of the number of occurrences of each distinct number. The list will be sorted on entries in the first column, largest to smallest." The entry list can be terminated with some arbitrary number (suggested -999). It should make use of: Loops Pointers Arrays Searching techniques User input Prompts Formatted output Sorting of Arrays Let me know if there is any more information needed to help. I can send the code that I have already started on if need be as well. https://redd.it/n4qn42 @r_cpp

C++ Coroutines - full Old New Thing series https://devblogs.microsoft.com/oldnewthing/?p=105178 https://redd.it/n4quav @r_cpp

C/C++ build system, I use xmake https://github.com/xmake-io/xmake/wiki/C-and-Cplusplus-build-system,-I-use-xmake https://redd.it/n4phh1 @r_cpp

Optimizing the Clang compiler’s line-to-offset mapping https://developers.redhat.com/blog/2021/05/04/optimizing-the-clang-compilers-line-to-offset-mapping/ https://redd.it/n4n4pt @r_cpp

"Should we break the ABI" is the wrong question https://nibblestew.blogspot.com/2021/05/should-we-break-abi-is-wrong-question.html https://redd.it/n4hjvf @r_cpp

Can you make variables equate to full sentences? So let's say I have a menu of items that look something like this at the start: ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| echo What would you like to test? Type the appropriate number to select an option. echo. echo 1. Economy echo 2. Combat echo 3. Action commands echo 4. How does code work? echo 5. EXIT set /p input=Select a number: if %input% == 1 goto Economy ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Can I make it so that I can use spaces for the equation to the variable? Like instead of "1" can I have it respond to "open economy" or even "Please open the economy section"? if I use underscores like "open_economy" it responds but once spaces are involved it makes the batch file crash. https://redd.it/n4ebp6 @r_cpp

Instant replay: Debugging C and C++ programs with rr https://developers.redhat.com/blog/2021/05/03/instant-replay-debugging-c-and-c-programs-with-rr/ https://redd.it/n49fhl @r_cpp

What's the coolest thing you've created with c++? I just got into c++ a month or so ago and I'm wondering what's possible. For me, it has been a game of twenty one. https://redd.it/n49pvw @r_cpp

Learning issues. Hi there, Since the beginning of this year I have dedicated my time to learning programming because CS is my target major at college next fall. I’ve been through some tutorials and courses on the internet. I’ve been through some python codes, but my problem is just I find my self coping and pasting the code :( Typing the code is just the same and copying and pasting. I don’t find myself learning that much really. But I am a lot into the concepts of computers🤷‍♂️ Is there someone who find themselves or have gone through a similar experience 🤔 Is there any advice, or is it jus a lack of my motivation🤔 https://redd.it/n481f2 @r_cpp

Break ABI to save c++ https://youtu.be/By7b19YIv8Q https://redd.it/n425bb @r_cpp

C++ Weekly - Ep 270 - Break ABI to Save C++ https://youtu.be/By7b19YIv8Q https://redd.it/n425r6 @r_cpp

C++ coroutines: Converting among tasks that use the same promise https://devblogs.microsoft.com/oldnewthing/20210503-00/?p=105173 https://redd.it/n3z0ab @r_cpp

Another paper: Modulated jump-counting skipfield patterns This's an extension of my earlier work on jump-counting skipfields - it adds the ability to selectively skip one or more types of objects based on preset criteria. In other words, skipping runs of red objects OR green objects in O(1) time becomes possible, with the same skipfield. There are tradeoffs as always. Unsure what it's useful for, but probably some kind of multiset. We'll see: https://plflib.org/matt\_bentley\_-\_modulated\_jump-counting\_patterns.pdf https://redd.it/n3fel9 @r_cpp

C++20 Concepts - a Quick Introduction https://www.cppstories.com/2021/concepts-intro/ https://redd.it/n3vfgm @r_cpp

C++ dependency management and nested dependencies I'm working on a C++ project which requires tight control of our dependencies (including a controlled copy of the dependency source, or at least a binary). Based on these requirements, I intend to keep a copy of our dependencies in version control, build them, and statically link them into the project. However, I am stumped by the problem of nested dependencies (i.e. the dependencies of my dependencies). For example, qt5. How can I control these nested dependencies without spiralling into an endless chain of building things from source? I understand that dependencies are a tough topic in C++ so I'm not expecting easy answers, but any wisdom you can share would be a great help. https://redd.it/n3sbyg @r_cpp

std::stringview/std::string implementation with two pointers? Hi all, I was looking around in standard libraries and other libraries (like llvm, folly etc) for the implementation of strings and stringview and basically all of them are in the form of:

class string_view
{
public:
  using const_iterator const char*;

  const_iterator begin() const { return m_begin; }
  const_iterator end() const { return m_begin + m_size; }

private:
  const char* m_begin;
  size_t m_size;
};

while none are in the form of

class string_view
{
public:
  using const_iterator const char*;

  const_iterator begin() const { return m_begin; }
  const_iterator end() const { return m_end; }

private:
  const char* m_begin;
  const char* m_end;
};

Is there a real technical reason? Some performance gain? I've tried looking for answers but nothing came up so if you have any link to some insights please share. https://redd.it/n3iiyv @r_cpp

[Belay the C++] Passing an enum by parameter https://belaycpp.com/2021/05/03/passing-an-enum-by-parameter/ https://redd.it/n3s2vl @r_cpp

[[silence_warning]] attribute has anyone been thinking of proposing a `[[silence_warning]]` attribute? it could be paired with `[[deprecated]]` to indicate that the user is aware of doing something being potentially dangerous, but has a legitimate reason to do it anyways. [[deprecated("use of force_release() breaks RAII for blah blah and therefore you should not call this function unless you know exactly what you are doing")]] auto force_release() {} auto f() { force_release(); // deprecation warning } auto g() { [[silence_warning("I am confident that force_release() here will not break things")]] force_release(); // OK } https://redd.it/n3qw6h @r_cpp