Checking that all items in a collection match a predicate in Scala
There are built-in functions for this: List(1,2,3,4).forall(x => x < 5) res0: Boolean = true for any: List(1,2,3,4).exists(x => x > 3) res1: Boolean = true
predicate
C++ remove_if on a vector of objects
Should I create a member variable in the object which allows me to say that I want to delete the myobj and then create a predicate which checks to see if the member variable was set? Haven’t you already done that? Isn’t that what m_bMarkedDelete is for? You would write the predicate like this: bool … Read more
Xpath expression with multiple predicates
The following should do what you’re after: /root/user[login=’user1′ and name=”User 1″ and profile=”admin” and profile=”operator”] Having two tests for the profile value might seem odd, but as there are multiple profile nodes then the condition will be satisfied as long as at least one node matches the test. The reason you can compare profile directly … Read more
What is predicate in C++? [closed]
A predicate is a C++ function returning a boolean or an object having a bool operator() member. A unary predicate takes one argument, a binary takes two, and so on. Examples of questions predicates can answer for a particular algorithm are: Is this element what we are looking for? Is the first of two arguments … Read more
Java interface like Predicate, but without an argument
You’re looking for BooleanSupplier. https://docs.oracle.com/javase/8/docs/api/java/util/function/BooleanSupplier.html
Why do C++ classes without member variables occupy space?
It’s necessary to satisfy an invariant from the C++ standard: every C++ object of the same type needs to have a unique address to be identifiable. If objects took up no space, then items in an array would share the same address.
How to convert an Expression to a Predicate
Func<T, bool> func = expression.Compile(); Predicate<T> pred = t => func(t); Edit: per the comments we have a better answer for the second line: Predicate<T> pred = func.Invoke;
How to apply multiple predicates to a java.util.Stream?
If you have a Collection<Predicate<T>> filters you can always create a single predicate out of it using the process called reduction: Predicate<T> pred=filters.stream().reduce(Predicate::and).orElse(x->true); or Predicate<T> pred=filters.stream().reduce(Predicate::or).orElse(x->false); depending on how you want to combine the filters. If the fallback for an empty predicate collection specified in the orElse call fulfills the identity role (which x->true does … Read more
List.RemoveAll – How to create an appropriate Predicate
The RemoveAll() methods accept a Predicate<T> delegate (until here nothing new). A predicate points to a method that simply returns true or false. Of course, the RemoveAll will remove from the collection all the T instances that return True with the predicate applied. C# 3.0 lets the developer use several methods to pass a predicate … Read more
How to make Selenium wait until an element is present?
You need to call ignoring with an exception to ignore while the WebDriver will wait. FluentWait<WebDriver> fluentWait = new FluentWait<>(driver) .withTimeout(30, TimeUnit.SECONDS) .pollingEvery(200, TimeUnit.MILLISECONDS) .ignoring(NoSuchElementException.class); See the documentation of FluentWait for more information. But beware that this condition is already implemented in ExpectedConditions, so you should use: WebElement element = (new WebDriverWait(driver, 10)) .until(ExpectedConditions.elementToBeClickable(By.id(“someid”))); *Fewer … Read more