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|  How to Fix Error: 'barrier' is not a member of 'std'

How to Fix Error: 'barrier' is not a member of 'std'

October 14, 2024

Discover step-by-step solutions to resolve the 'barrier' error in C++ firmware development. Enhance your coding workflow with practical and easy-to-follow advice.

How to Fix Error: 'barrier' is not a member of 'std'

 

Understanding the Error

  • The error `'barrier' is not a member of 'std'` typically occurs when you try to use the `std::barrier` class, which was introduced in C++20. If your environment does not support C++20 or you've not enabled the C++20 standard, this error can occur.
  • Ensure you are compiling your code with at least C++20 standard. For example, in GCC or Clang, you need the `-std=c++20` flag.

 

Confirm Compiler Support

  • Ensure your compiler version supports C++20. For GCC, version 10 or later is needed; for Clang, version 11 or later usually supports enough C++20 features including `std::barrier`.
  • To check your GCC version, run `g++ --version`. For Clang, use `clang++ --version` on your terminal.

 

Update Your Compiler

  • If your compiler version is outdated, consider updating it. For Linux, you can use your package manager, e.g., `sudo apt update` followed by `sudo apt install g++-11` for GCC 11.
  • On Windows, you can download the latest GCC version through MinGW or install Clang through LLVM distribution packages.

 

Compile with Correct Flags

  • Ensure your build system compiles with the correct flags. For example, add `-std=c++20` in the compilation command:
  • Example for GCC or Clang:
g++ -std=c++20 -o my_program my_program.cpp

 

Using Alternative Libraries

  • If you are unable to switch to a compiler that supports C++20, consider using other synchronization primitives available in pre-C++20 environments like `std::mutex`, `std::condition_variable`, or third-party libraries like Boost which might have similar features.
  • Example using `std::mutex` and `std::condition_variable`:
#include <iostream>
#include <mutex>
#include <condition_variable>
#include <thread>

std::mutex mtx;
std::condition_variable cv;
bool ready = false;

void waitForBarrier() {
    std::unique_lock<std::mutex> lock(mtx);
    cv.wait(lock, [] { return ready; });
    // Thread proceeds after barrier
    std::cout << "Thread past barrier\n";
}

void reachBarrier() {
    {
        std::lock_guard<std::mutex> lock(mtx);
        ready = true;
    }
    cv.notify_all();
}

int main() {
    std::thread t1(waitForBarrier);
    std::thread t2(reachBarrier);

    t1.join();
    t2.join();
}

 

Review Documentation and Examples

  • Study the current documentation of your preferred or available C++ standard library to understand the provision of `std::barrier` or its alternatives.
  • Visit online resources and examples to better grasp the usage patterns and best practices for synchronization primitives that are compatible with your toolchain.

 

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