CppCoreGuidelines | true guidelines , rules , and best practices | Application Framework library

 by   isocpp Python Version: v0.8 License: Non-SPDX

kandi X-RAY | CppCoreGuidelines Summary

kandi X-RAY | CppCoreGuidelines Summary

CppCoreGuidelines is a Python library typically used in Server, Application Framework, Ruby On Rails applications. CppCoreGuidelines has no bugs, it has no vulnerabilities and it has medium support. However CppCoreGuidelines build file is not available and it has a Non-SPDX License. You can download it from GitHub.

"Within C++ is a smaller, simpler, safer language struggling to get out." -- Bjarne Stroustrup. The C++ Core Guidelines are a collaborative effort led by Bjarne Stroustrup, much like the C++ language itself. They are the result of many person-years of discussion and design across a number of organizations. Their design encourages general applicability and broad adoption but they can be freely copied and modified to meet your organization's needs.

            kandi-support Support

              CppCoreGuidelines has a medium active ecosystem.
              It has 38056 star(s) with 5106 fork(s). There are 1974 watchers for this library.
              It had no major release in the last 12 months.
              There are 212 open issues and 875 have been closed. On average issues are closed in 70 days. There are 6 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of CppCoreGuidelines is v0.8

            kandi-Quality Quality

              CppCoreGuidelines has 0 bugs and 0 code smells.

            kandi-Security Security

              CppCoreGuidelines has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              CppCoreGuidelines code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              CppCoreGuidelines has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              CppCoreGuidelines releases are available to install and integrate.
              CppCoreGuidelines has no build file. You will be need to create the build yourself to build the component from source.
              Installation instructions are available. Examples and code snippets are not available.
              CppCoreGuidelines saves you 1556 person hours of effort in developing the same functionality from scratch.
              It has 3462 lines of code, 179 functions and 3 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed CppCoreGuidelines and discovered the below as its top functions. This is intended to give you an instant insight into CppCoreGuidelines implemented functionality, and help decide if they suit your requirements.
            • Parse md file
            • Print the total error counts
            • Formats the test suite
            • Sets filters
            • Return the marker from a line
            • Check if the line is a code block
            • Write code lines
            • Parse command line arguments
            • Expand directories
            • Print the error categories
            • Print the usage message
            • Return a set of all supported header extensions
            • Processes a file
            • Increments the error count
            • Determines if the given category should be printed
            • Prints the error message
            • Determines if a declaration is a declaration
            • Checks if the start of the beginning of the file
            • Check if a line is a code block
            • Print the error counts
            • Writes code lines to a file
            • Extract the marker from a line
            • Collapse strings
            • Flag C ++ features
            • Check for end of the class definition
            • Format the test tests
            • Check end of namespace comments
            • Removes whitespace from a string
            • Returns a set of supported extensions
            Get all kandi verified functions for this library.

            CppCoreGuidelines Key Features

            No Key Features are available at this moment for CppCoreGuidelines.

            CppCoreGuidelines Examples and Code Snippets

            Coding Style (C++)
            C++dot img1Lines of Code : 0dot img1License : Permissive (MIT)
            copy iconCopy
            namespace fs {
            class path : public std::filesystem::path
            // The intention is to disallow this function.
            bool exists(const fs::path& p) = delete;
            } // namespace fs
            int main()
                //fs::path p; // error

            Community Discussions


            How do I replace this raw loop with an STL algorithm or iterators? (avoiding unchecked subscript operator)
            Asked 2022-Jan-04 at 16:36

            I'm implementing a generic clone of the Snake game in C++ as an exercise in following the C++ Recommended Guidelines. I'm currently working on the Snake's update() method, which is tiggering a Guideline-violation for using the unchecked subscript operator in a for loop:

            Prefer to use gsl::at() instead of unchecked subscript operator (bounds.4).

            I want to avoid the redundant range change check of gsl::at() / container::at(), and don't want to suppress the warning either. With that in mind, how can I replace this raw loop with something more Guideline-friendly? (eg. an STL algorithm, iterators, what have you)



            Answered 2022-Jan-04 at 16:36

            You can std::rotate the snake so that the old tail is the front element, and then overwrite that with the new segment.

            Source https://stackoverflow.com/questions/70581832


            C++ - Implicit conversion of unsigned long long to signed long long?
            Asked 2021-Dec-08 at 14:37

            I'm having a rather strange warning being reported by clang-tidy 12.0.1. In the following code:



            Answered 2021-Dec-08 at 13:34

            To show the actual types involved :

            Source https://stackoverflow.com/questions/70275235


            Why copy/move assignment operator should be declared non-virtual?
            Asked 2021-Dec-07 at 22:11

            According to CppCoreGuidelines C.60 and C.63, copy assignment operator (e.g Foo& operator=(const Foo& x)) and move assignement operator (e.g Foo& operator=(const Foo&& x)) should be declared non-virtual.

            Can you explain me the reason of this recommandation ? As suggested by this answer, I imagine that this is to avoid leaks of memory but I don't see exactly how the use of virtual will induce it.



            Answered 2021-Dec-07 at 22:11

            There is no reason why a copy or move assignment operator should be virtual. Making it virtual possibly incurs costs associated with having virtual functions (e.g. the requirement to allocate a vptr within each object of the class) for no benefit.

            Let's say you have a class Base, which has a virtual copy assignment operator:

            Source https://stackoverflow.com/questions/70267454


            How to get clang to warn about very simple narrowing
            Asked 2021-Oct-13 at 00:10

            If I am using clang tools, what is the recommended way to get clang or some part of the clang toolchain to tell me that e.g. passing an int to a function that takes a short might be a bad idea?
            Given this very simple program



            Answered 2021-Oct-13 at 00:10

            The -Weverything option is useful in situations like this. It enables every warning option that clang has, including many that -Wall -Wextra doesn't include. Many of them are useless or counterproductive, but if there is one that warns on the code you consider problematic, this will let you find it, and tell you which option would enable it specifically. Try it on godbolt.

            In this case, using -Weverything shows us:

            Source https://stackoverflow.com/questions/69547984


            CppCoreGuidlines R.33 Why pass `unique_ptr` by reference?
            Asked 2021-Sep-24 at 08:39

            The CppCoreGuidlines rule R.33 suggests to

            Take a unique_ptr& parameter to express that a function reseats the widget.

            Reason Using unique_ptr in this way both documents and enforces the function call’s reseating semantics.

            Note “reseat” means “making a pointer or a smart pointer refer to a different object.”

            I don't understand why we should pass by reference when reseat means "making a pointer or a smart pointer refer to a different object.”

            When the function's purpose is to reseat/change the underlying object the pointer is pointing to, aren't we stealing the ownership from the caller this way and therefore should pass the unique_ptr by value, hence moving it and transferring ownership?

            Is there an example that explains why passing a unique_ptr by reference is recommended?



            Answered 2021-Sep-24 at 08:39

            When the function's purpose is to reseat/change the underlying object the pointer is pointing to, aren't we stealing the ownership from the caller this way

            No. Neither when we "reseat" a pointer, nor when we change the pointed object, do we take ownership of the pointer i.e. we aren't transferring the ownership.

            Is there an example that explains why passing a unique_ptr by reference is recommended?

            Here is an example of a function that "reseats" a unique pointer:

            Source https://stackoverflow.com/questions/69311574


            How to convert string to const unsigned char* without using reinterpret_cast (modern approach)
            Asked 2021-Sep-08 at 14:41

            I have variable input type const std::string&:



            Answered 2021-Sep-08 at 14:34

            Apparently type punning with an union is UB so definitely don't do this.
            (Keeping the answer for posterity though!)

            To strictly answer your question, there's this way:

            Source https://stackoverflow.com/questions/69104539


            Fix for C++ Compiler Error - multiple definition
            Asked 2021-Sep-06 at 08:02

            i am trying to make a program that gave you sum of array elements absolute value .

            this is the header file :



            Answered 2021-Sep-05 at 16:16

            Headers are substituted textually into every compilation unit where they are #include'd; as a result you have definitions of getAbsSum in both getAbsSum.cpp and main.cpp. This violates the one-definition rule.

            The correct way to use a header is to include the declaration in the header and the definition in the cpp file; you have this backwards.

            Alternatively, for small functions that don't have a lot of dependencies, you may choose to get rid of getAbsSum.cpp, mark the definition in the header as inline, and then anyone including your header will get a definition of the function.

            Source https://stackoverflow.com/questions/69065093


            How to avoid clang-tidy warnings about uninitialized variables
            Asked 2021-Jul-26 at 08:25

            I am looking for the best way to avoid cppcoreguidelines-init-variables warnings with clang-tidy.



            Answered 2021-Jul-26 at 08:25

            In general you should initialize variables always because reading from an uninitialized variable is undefined behavior.

            When extraction from the stream fails then since C++11 a 0 is assigned. However, this is only the case as long as the stream is not in a fail state. Hence, when reading x fails then x will have a value of 0 but the others will have an indetermindate value.

            You should always check if extraction succeded:

            Source https://stackoverflow.com/questions/68526284


            Where do standard library or compilers leverage noexcept move semantics (other than vector growth)?
            Asked 2021-Apr-19 at 02:27

            Move operations should be noexcept; in the first place for intuitive and reasonable semantics. The second argument is runtime performance. From the Core Guidelines, C.66, "Make move operations noexcept":

            A throwing move violates most people’s reasonably assumptions. A non-throwing move will be used more efficiently by standard-library and language facilities.

            The canonical example for the performance-part of this guideline is the case when std::vector::push_back or friends need to grow the buffer. The standard requires a strong exception guarantee here, and this can only move-construct the elements into the new buffer if this is noexcept - otherwise, it must be copied. I get that, and the difference is visible in benchmarks.

            However, apart from this, I have a hard time finding real-world evidence of the positive performance impact of noexcept move semantics. Skimming through the standard library (libcxx + grep), we see that std::move_if_noexcept exists, but it's almost not used within the library itself. Similarly, std::is_noexcept_swappable is merely used for fleshing out conditional noexcept qualifiers. This doesn't match existing claims, for example this one from "C++ High Performance" by Andrist and Sehr (2nd ed., p. 153):

            All algorithms use std::swap() and std::move() when moving elements around, but only if the move constructor and move assignment are marked noexcept. Therefore, it is important to have these implemented for heavy objects when using algorithms. If they are not available and exception free, the elements will be copied instead.

            To break my question into pieces:

            1. Are there code paths in the standard library similar to the std::vector::push_back, that run faster when fed with std::is_nothrow_move_constructible types?
            2. Am I correct to conclude that the cited paragraph from the book is not correct?
            3. Is there an obvious example for when the compiler will reliably generate more runtime-efficient code when a type adheres to the noexcept guideline?

            I know the third one might be a bit blurry. But if someone could come up with a simple example, this would be great.



            Answered 2021-Mar-03 at 15:44

            vector push_back, resize, reserve, etc is very important case, as it is expected to be the most used container.

            Anyway, take look at std::fuction as well, I'd expect it to take advantage of noexcept move for small object optimization version.

            That is, when functor object is small, and it has noexcept move constructor, it can be stored in a small buffer in std::function itself, not on heap. But if the functor doesn't have noexcept move constructor, it has to be on heap (and don't move when std::function is moved)

            Overall, there ain't too many cases indeed.

            Source https://stackoverflow.com/questions/66459162


            Why is this dangling-gsl warning invoked?
            Asked 2021-Feb-20 at 11:27

            I am analyzing a codebase with clang-tidy and see a warning I do not understand. The warning is invoked by the following lines of code:



            Answered 2021-Feb-20 at 11:27

            Consider the statement...

            Source https://stackoverflow.com/questions/66290661

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install CppCoreGuidelines

            The guidelines themselves are found at CppCoreGuidelines. The document is in GH-flavored MarkDown. It is intentionally kept simple, mostly in ASCII, to allow automatic post-processing such as language translation and reformatting. The editors maintain one version formatted for browsing. Note that it is manually integrated and can be slightly older than the version in the master branch. The Guidelines are a constantly evolving document without a strict "release" cadence. Bjarne Stroustrup periodically reviews the document and increments the version number in the introduction. Checkins that increment the version number are tagged in git. Many of the guidelines make use of the header-only Guidelines Support Library. One implementation is available at GSL: Guidelines Support Library.


            Comments and suggestions for improvements are most welcome. We plan to modify and extend this document as our understanding improves and the language and the set of available libraries improve. More details are found at CONTRIBUTING and LICENSE. Thanks to DigitalOcean for hosting the Standard C++ Foundation website.
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