Parallel execution policies in C++ 17

Parallel execution policies in C++ 17

By : kiyakaelar
Date : November 22 2020, 07:01 PM
will be helpful for those in need In VS 15.8 generate is not implemented as a parallel function. So if the time for the code is dominated by the generate function, there will be no significant difference in the execution time of your sample code.
Also, it is good practice to use a high resolution timer:
code :
#include <chrono>
using std::chrono::high_resolution_clock;

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Difference between execution policies and when to use them

Difference between execution policies and when to use them

By : Jayapriya
Date : March 29 2020, 07:55 AM
This might help you seq means "execute sequentially" and is the exact same thing as the version without an execution policy.
par means "execute in parallel", which permits the implementation to execute on multiple threads in parallel. You are responsible for making sure that no data races happen within f.
How do I use the new C++17 execution policies?

How do I use the new C++17 execution policies?

By : Pradip Tivhale
Date : March 29 2020, 07:55 AM
I wish did fix the issue. was not yet finalized. And various compilers have not yet fully implemented it.
-std=c++17 means "give me all of C++17 you have finished", not "be a perfectly valid C++17 compiler".
Bypass vs Unrestricted execution policies

Bypass vs Unrestricted execution policies

By : ABC
Date : March 29 2020, 07:55 AM
Hope this helps Per the comments, there should be no particular difference with how these execution policies behave. However Bypass is intended to be used when you are temporarily changing the execution policy during a single run of Powershell.exe, where as Unrestricted is intended to be used if you wish to permanently change the setting for the exeuction policy for one of the system scopes (MachinePolicy, UserPolicy, Process, CurrentUser, LocalMachine).
Some examples:
code :
Set-ExecutionPolicy Unrestricted
powershell.exe .\yourscript.ps1 -executionpolicy bypass
 Set-ExecutionPolicy Bypass -Scope Process
Different execution policies at runtime

Different execution policies at runtime

By : Vishal Dhurat
Date : March 29 2020, 07:55 AM
will help you The standard approach here is to separate the selection of a type from the use of the type: the latter takes the form of a function template instantiated several times by the former non-template function (or function template with fewer template parameters).
To avoid duplicating the normal parameters between these two layers, use a generic lambda as the template. To avoid duplicating the selection logic, make a function template that calls whatever lambda with the appropriate policy:
code :
enum Policy {seq,par,par_unseq};

template<class F>
auto maybe_parallel(F f,Policy p) {
  switch(p) {
  case seq: return f(std::execution::seq);
  case par: return f(std::execution::par);
  default: return f(std::execution::par_unseq);

auto f2(const std::vector<std::string>& vec,
        const std::string& elem,Policy p) {
  return maybe_parallel
    ([&](auto &pol) {return std::find(pol,vec.begin(),vec.end(),elem);},p);
Parallel execution of test throws exception when parallel is set to true on DataProvider - TestNG

Parallel execution of test throws exception when parallel is set to true on DataProvider - TestNG

By : user3603955
Date : March 29 2020, 07:55 AM
it should still fix some issue The problem lies in your test code. Your webdriver instances are getting shared across test methods when you run tests in parallel and powered by a data provider.
Here's a fixed version of your BaseTest and BrowserDriverFactory to include thread safety.
code :
import java.lang.reflect.Method;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxProfile;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.ITestContext;
import org.testng.ITestResult;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;

public class BaseTest {
  private static final ThreadLocal<WebDriver> drivers = new ThreadLocal<>();
  public WebDriverWait wait;
  protected FirefoxProfile profile;
  protected String url = "http://www.qaclickacademy.com/";

  protected String testSuiteName;
  protected String testName;
  protected String testMethodName;

  public WebDriver getDriver() {
    return drivers.get();

  public void setUp(Method method, ITestContext ctx) {
    String testName = ctx.getCurrentXmlTest().getName();

    WebDriver driver = BrowserDriverFactory.createDriver("firefox");

    wait = new WebDriverWait(driver, 5);

    this.testSuiteName = ctx.getSuite().getName();
    this.testName = testName;
    this.testMethodName = method.getName();

  @AfterMethod(alwaysRun = true)
  public void tearDown(ITestResult result) {
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxOptions;
import org.openqa.selenium.firefox.FirefoxProfile;

public class BrowserDriverFactory {

  public static WebDriver createDriver(String browser) {
    System.err.println("Create driver: " + browser);

    if (browser.equals("chrome")) {
      System.setProperty("webdriver.chrome.driver", "src/main/resources/chromedriver.exe");
      return new ChromeDriver();
    } else if (browser.equals("firefox")) {
      System.setProperty("webdriver.gecko.driver", "src/main/resources/geckodriver.exe");
      FirefoxOptions options = new FirefoxOptions();
      FirefoxProfile profile = new FirefoxProfile();
      profile.setPreference("browser.helperApps.neverAsk.openFile", "application/octet-stream");
      return new FirefoxDriver(options);
    System.out.println("Do not know how to start: " + browser + ", starting chrome.");
    System.setProperty("webdriver.chrome.driver", "src/main/resources/chromedriver.exe");
    return new ChromeDriver();
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