Boost | The Boost C++ Libraries | SDK library

 by   blackberry C++ Version: Current License: BSL-1.0

kandi X-RAY | Boost Summary

kandi X-RAY | Boost Summary

Boost is a C++ library typically used in Utilities, SDK applications. Boost has no bugs, it has a Permissive License and it has low support. However Boost has 1 vulnerabilities. You can download it from GitHub.

Current Boost Version: 1.52.0. For the most part, Boost requires almost no changes to work in BlackBerry 10 ("BB10"). All required code changes are pushed upstream whenever possible.
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            kandi-support Support

              Boost has a low active ecosystem.
              It has 193 star(s) with 125 fork(s). There are 33 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 11 open issues and 1 have been closed. On average issues are closed in 1 days. There are 3 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of Boost is current.

            kandi-Quality Quality

              Boost has 0 bugs and 0 code smells.

            kandi-Security Security

              Boost has 1 vulnerability issues reported (0 critical, 0 high, 1 medium, 0 low).
              Boost code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              Boost is licensed under the BSL-1.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              Boost releases are not available. You will need to build from source code and install.
              Installation instructions are available. Examples and code snippets are not available.
              It has 1819325 lines of code, 1929 functions and 13347 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

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            Boost Key Features

            No Key Features are available at this moment for Boost.

            Boost Examples and Code Snippets

            No Code Snippets are available at this moment for Boost.

            Community Discussions

            QUESTION

            Expo eas-cli iOS build failing
            Asked 2022-Mar-24 at 03:11

            I have created an app using React Native and am trying to create an iOS app store build through Expo's eas-cli.

            When running eas build --platform ios the Fastlane build failed with unknown error

            After checking the "Run Fastlane" section in the Expo build log, multiple errors are shown:

            Error 1:

            ...

            ANSWER

            Answered 2021-Oct-06 at 06:11

            There are a number of things to look into.
            If you are running Expo in the SDK then no need for cocoa pods just the most up-to-date version of the CLI tool.

            Run expo --version to determine what version you are currently working with. Update if needed.

            Adding a profile might be useful too. Along with checking your config. Configuring EAS Build with eas.json

            eas build --platform ios --profile distribution

            Also, be sure that all the apple certificates are active and connected to your Expo account for that project.

            Source https://stackoverflow.com/questions/69155305

            QUESTION

            Standard compliant host to network endianess conversion
            Asked 2022-Mar-03 at 15:19

            I am amazed at how many topics on StackOverflow deal with finding out the endianess of the system and converting endianess. I am even more amazed that there are hundreds of different answers to these two questions. All proposed solutions that I have seen so far are based on undefined behaviour, non-standard compiler extensions or OS-specific header files. In my opinion, this question is only a duplicate if an existing answer gives a standard-compliant, efficient (e.g., use x86-bswap), compile time-enabled solution.

            Surely there must be a standard-compliant solution available that I am unable to find in the huge mess of old "hacky" ones. It is also somewhat strange that the standard library does not include such a function. Perhaps the attitude towards such issues is changing, since C++20 introduced a way to detect endianess into the standard (via std::endian), and C++23 will probably include std::byteswap, which flips endianess.

            In any case, my questions are these:

            1. Starting at what C++ standard is there a portable standard-compliant way of performing host to network byte order conversion?

            2. I argue below that it's possible in C++20. Is my code correct and can it be improved?

            3. Should such a pure-c++ solution be preferred to OS specific functions such as, e.g., POSIX-htonl? (I think yes)

            I think I can give a C++23 solution that is OS-independent, efficient (no system call, uses x86-bswap) and portable to little-endian and big-endian systems (but not portable to mixed-endian systems):

            ...

            ANSWER

            Answered 2022-Feb-06 at 05:48

            compile time-enabled solution.

            Consider whether this is useful requirement in the first place. The program isn't going to be communicating with another system at compile time. What is the case where you would need to use the serialised integer in a compile time constant context?

            1. Starting at what C++ standard is there a portable standard-compliant way of performing host to network byte order conversion?

            It's possible to write such function in standard C++ since C++98. That said, later standards bring tasty template goodies that make this nicer.

            There isn't such function in the standard library as of the latest standard.

            1. Should such a pure-c++ solution be preferred to OS specific functions such as, e.g., POSIX-htonl? (I think yes)

            Advantage of POSIX is that it's less important to write tests to make sure that it works correctly.

            Advantage of pure C++ function is that you don't need platform specific alternatives to those that don't conform to POSIX.

            Also, the POSIX htonX are only for 16 bit and 32 bit integers. You could instead use htobeXX functions instead that are in some *BSD and in Linux (glibc).

            Here is what I have been using since C+17. Some notes beforehand:

            • Since endianness conversion is always1 for purposes of serialisation, I write the result directly into a buffer. When converting to host endianness, I read from a buffer.

            • I don't use CHAR_BIT because network doesn't know my byte size anyway. Network byte is an octet, and if your CPU is different, then these functions won't work. Correct handling of non-octet byte is possible but unnecessary work unless you need to support network communication on such system. Adding an assert might be a good idea.

            • I prefer to call it big endian rather than "network" endian. There's a chance that a reader isn't aware of the convention that de-facto endianness of network is big.

            • Instead of checking "if native endianness is X, do Y else do Z", I prefer to write a function that works with all native endianness. This can be done with bit shifts.

            • Yeah, it's constexpr. Not because it needs to be, but just because it can be. I haven't been able to produce an example where dropping constexpr would produce worse code.

            Source https://stackoverflow.com/questions/71003780

            QUESTION

            Asio difference between prefer, require and make_work_guard
            Asked 2022-Feb-21 at 17:14

            In the following example I start a worker thread for my application. Later I post some work to it. To prevent it from returning prematurely I have to ensure "work" is outstanding. I do this with a work_guard object. However I have found two other ways to "ensure" work. Which one should I use throughout my application? Is there any difference?

            ...

            ANSWER

            Answered 2022-Feb-21 at 17:14

            My knowledge comes from e.g. WG22 P0443R12 "A Unified Executors Proposal for C++".

            Some differences up front: a work-guard

            • does not alter the executor, instead just calling on_work_started() and on_work_finished() on it. [It is possible to have an executor on which both of these have no effect.]
            • can be reset() independent of its lifetime, or that of any executor instance. Decoupled lifetime is a feature.

            On the other hand, using prefer/require to apply outstanding_work sub-properties:

            • modifies existing executors
            • notably when copied, all copies will have the same properties. This could be dangerous for something as invasive as keeping an execution context/resources around.
            Scanning The Field

            However, not all properties are requirable in the first place. Doing some reconaissance using Ex defined as:

            Source https://stackoverflow.com/questions/71194070

            QUESTION

            Missing bounds checking elimination in String constructor?
            Asked 2022-Jan-30 at 21:18

            Looking into UTF8 decoding performance, I noticed the performance of protobuf's UnsafeProcessor::decodeUtf8 is better than String(byte[] bytes, int offset, int length, Charset charset) for the following non ascii string: "Quizdeltagerne spiste jordbær med flØde, mens cirkusklovnen".

            I tried to figure out why, so I copied the relevant code in String and replaced the array accesses with unsafe array accesses, same as UnsafeProcessor::decodeUtf8. Here are the JMH benchmark results:

            ...

            ANSWER

            Answered 2022-Jan-12 at 09:52

            To measure the branch you are interested in and particularly the scenario when while loop becomes hot, I've used the following benchmark:

            Source https://stackoverflow.com/questions/70272651

            QUESTION

            Why second spin in Spinlock gives performance boost?
            Asked 2022-Jan-28 at 15:23

            Here is a basic Spinlock implemented with std::atomic_flag.
            The author of the book claims that second while in the lock() boosts performance.

            ...

            ANSWER

            Answered 2022-Jan-28 at 05:13

            Reading a memory address does not clear the cache line.

            Writing does.

            So in a modern computer, there is RAM, and there are multiple layers of cache "around" the CPU (they are called L1, L2 and L3 cache, but the important part is that they are layers, and the CPU is at the middle). In a multi-core system, often the outer layers are shared; the innermost layer is usually not, and is specific to a given CPU.

            Clearing the cache line means informing every other cache holding this memory "the data you own may be stale, throw it out".

            Test and set writes true and atomically returns the old value. It clears the cache line, because it writes.

            Test does not write. If you have another thread unsynchronized with this one, it reading the cache of this memory doesn't have to be poked.

            The outer loop writes true, and exits if it replaced false. The inner loop waits until there is a false visible, then falls to outer loop. The inner loop need not clear every other cpu's cache status of the value of the atomic flag, but the outer has to (as it could change the false to true). As spinning could go on for a while, avoiding continuous cache clearing seems like a good idea.

            Source https://stackoverflow.com/questions/70887350

            QUESTION

            Updated React Native, can't find 'boost' dependency in Podfile
            Asked 2022-Jan-24 at 12:33

            As mentioned in my question title, I'm trying to run pod install following an update to React Native 0.66, and I keep getting the following error:

            ...

            ANSWER

            Answered 2021-Oct-20 at 14:40

            I recently encountered a similar issue with boost after updating react native. After the panic wore off, and some good coffee, I was able to resolve by doing the following:

            1. Open the /ios/.xcworkspace file in Xcode.
            2. Raise the iOS Deployment Target (in my case I only bumped to 10).
            3. Product > Clean Build Folder, then Product > Run.
            4. Locate the boost error in the issue navigator and identify which pod the error is listed under (in my case it was RNReanimated).
            5. Update the node package related to the pod (in my case, npm update react-native-reanimated
            6. Finally, run pod install

            After performing those steps, I was able to get my project up and running again.

            Source https://stackoverflow.com/questions/69424677

            QUESTION

            Cannot fix the lack of memory problem in running "pvargmm"
            Asked 2021-Dec-26 at 05:44

            My computer uses a CPT of Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz 2.59 GHz. Also my RAM memory size is 16 GB. When I run the following panel VAR model "pvargmm" in R,

            ...

            ANSWER

            Answered 2021-Dec-14 at 00:24

            Not an answer, but this might help someone else answer this. I coded this to re-create a data.frame of the size @Eric is working with.

            Source https://stackoverflow.com/questions/70232921

            QUESTION

            Most insanely fastest way to convert 9 char digits into an int or unsigned int
            Asked 2021-Dec-21 at 21:48
            #include 
            #include 
            #include 
            #include 
            using namespace std;
            
            const int p[9] =   {1, 10, 100, 
                                1000, 10000, 100000, 
                                1000000, 10000000, 100000000};
                                
            class MyTimer {
             private:
              std::chrono::time_point starter;
              std::chrono::time_point ender;
            
             public:
              void startCounter() {
                starter = std::chrono::steady_clock::now();
              }
            
              double getCounter() {
                ender = std::chrono::steady_clock::now();
                return double(std::chrono::duration_cast(ender - starter).count()) /
                       1000000;  // millisecond output
              }
            };
                                
            int convert1(char *a) {
                int res = 0;
                for (int i=0; i<9; i++) res = res * 10 + a[i] - 48;
                return res;
            }
            
            int convert2(char *a) {
                return (a[0] - 48) * p[8] + (a[1] - 48) * p[7] + (a[2] - 48) * p[6]
                        + (a[3] - 48) * p[5] + (a[4] - 48) * p[4] + (a[5] - 48) * p[3]
                        + (a[6] - 48) * p[2] + (a[7] - 48) * p[1] + (a[8] - 48) * p[0];
            }
            
            int convert3(char *a) {
                return (a[0] - 48) * p[8] + a[1] * p[7] + a[2] * p[6] + a[3] * p[5]
                        + a[4] * p[4] + a[5] * p[3] + a[6] * p[2] + a[7] * p[1] + a[8]
                        - 533333328;
            }
            
            const unsigned pu[9] = {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
                100000000};
            
            int convert4u(char *aa) {
              const unsigned char *a = (const unsigned char*) aa;
              return a[0] * pu[8] + a[1] * pu[7] + a[2] * pu[6] + a[3] * pu[5] + a[4] * pu[4]
                  + a[5] * pu[3] + a[6] * pu[2] + a[7] * pu[1] + a[8] - (unsigned) 5333333328u;
            }
            
            int convert5(char* a) {
                int val = 0;
                for(size_t k =0;k <9;++k) {
                    val = (val << 3) + (val << 1) + (a[k]-'0');
                }
                return val;
            }
            
            const unsigned pu2[9] = {100000000, 10000000, 1000000, 100000, 10000, 1000, 100, 10, 1};
            
            int convert6u(char *a) {
              return a[0]*pu2[0] + a[1]*pu2[1] + a[2]*pu2[2] + a[3] * pu2[3] + a[4] * pu2[4] + a[5] * pu2[5] + a[6] * pu2[6] + a[7] * pu2[7] + a[8] - (unsigned) 5333333328u;
            }
            
            using ConvertFunc = int(char*);    
            
            volatile int result = 0; // do something with the result of function to prevent unexpected optimization
            void benchmark(ConvertFunc converter, string name, int numTest=10000) {
                MyTimer timer;
                const int N = 100000;
                char *a = new char[9*N + 1];
                double runtime = 0;
                
                for (int t=1; t<=numTest; t++) {        
                    // change something to prevent unexpected optimization
                    for (int i=0; i<9*N; i++) a[i] = rand() % 10 + '0'; 
            
                    timer.startCounter();
                    for (int i=0; i<9*N; i+= 9) result = converter(a+i);
                    runtime += timer.getCounter();
                }
                cout << name << ": " << runtime << "ms\n";
            }   
            
            int main() {        
                benchmark(convert1, "slow");
                benchmark(convert2, "normal");    
                benchmark(convert3, "fast");
                benchmark(convert4u, "unsigned");
                benchmark(convert5, "shifting");
                benchmark(convert6u, "reverse");
                return 0;
            }
            
            ...

            ANSWER

            Answered 2021-Dec-20 at 12:59

            An alternative candidate

            Use unsigned math to avoid UB of int overflow and allow for taking all the - 48 out and then into a constant.

            Source https://stackoverflow.com/questions/70420948

            QUESTION

            Fuzzy Matching in Elasticsearch gives different results in two different versions
            Asked 2021-Dec-17 at 18:25

            I have a mapping in elasticsearch with a field analyzer having tokenizer:

            ...

            ANSWER

            Answered 2021-Dec-09 at 11:28

            It's not related to ES version.

            Update max_expansions to more than 50.

            max_expansions : Maximum number of variations created.

            With 3 grams letter & digits as token_chars, ideal max_expansion will be (26 alphabets + 10 digits) * 3

            Source https://stackoverflow.com/questions/70255795

            QUESTION

            xcrun: error: SDK "iphoneos" cannot be located
            Asked 2021-Dec-15 at 20:35

            I'm not experienced so I can't really pinpoint what is the problem. Thanks for the help.

            I cloned this repo: https://github.com/flatlogic/react-native-starter.git

            And was trying to follow the steps below:

            Clone the repo

            git clone https://github.com/flatlogic/react-native-starter.git

            Navigate to clonned folder and Install dependencies

            cd react-native-starter && yarn install

            Install Pods

            cd ios && pod install

            When I got to the pod install I'm getting that error.

            ...

            ANSWER

            Answered 2021-Jul-28 at 18:31

            I think your pod install working fine and has done its job. You need to set up iPhone SDK on your mac then try to run cd ../ && react-native run-ios.

            Follow this guide : React Native Environment set up on Mac OS with Xcode and Android Studio

            Source https://stackoverflow.com/questions/68565356

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

            Vulnerabilities

            No vulnerabilities reported

            Install Boost

            run bbndk-env (.bat or .sh) to set up the BB10 NDK environment variables.
            run bootstrap (.bat or .sh) as you normally would to get Boost.Build set up.
            (optional) build Boost for your host platform, to check that everything is set up correctly.
            run bbbb (.bat or .sh) to build Boost for BlackBerry10.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
            Find more information at:

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