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How to properly check if std::function is empty in C++11?
...'re not checking for an empty lambda, but whether the std::function has a callable target stored in it. The check is well-defined and works because of std::function::operator bool which allows for implicit conversion to bool in contexts where boolean values are required (such as the conditional expr...
Is #pragma once part of the C++11 standard?
Traditionally, the standard and portable way to avoid multiple header inclusions in C++ was/is to use the #ifndef - #define - #endif pre-compiler directives scheme also called macro-guard scheme (see code snippet below).
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The resulting API analysis is too large when upload app to mac store
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Apple forbids using private or undocumented APIs in iOS apps. Any calls you make to methods that have the same name as private or undocumented API methods will be flagged as a private API use, even if the method being called is something you have defined yourself.
App Loader does an initial...
Meaning of Android Studio error: Not annotated parameter overrides @NonNull parameter
...(And also)
import android.support.annotation.NonNull;
The purpose is to allow the compiler to warn when certain assumptions are being violated (such as a parameter of a method that should always have a value, as in this particular case, although there are others). From the Support Annotations doc...
Why isn't textarea an input[type=“textarea”]?
...erent type (e.g. “textarea") than single-line fields ("text"), as they really are different types of things, and imply different issues (semantics) for client-side handling.
– Marc Andreessen, 11 October 1993
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How to add global ASP.Net Web Api Filters?
...or MVC and the other is for Web API. They are two separate things and normally you wouldn't want filters for one being applied to the other.
– Shane Courtrille
Aug 29 '12 at 15:26
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How do I interpret precision and scale of a number in a database?
...number of decimal places
ie 123456.789 has a scale of 3
Thus the maximum allowed value for decimal(5,2) is 999.99
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Proper usage of Optional.ifPresent()
...r> user = ...
user.ifPresent(this::doSomethingWithUser);
This is basically the same thing as
Optional<User> user = ...
user.ifPresent(new Consumer<User>() {
@Override
public void accept(User theUser) {
doSomethingWithUser(theUser);
}
});
The idea is that the d...
CMake: Project structure with unit tests
...sqr.h), and then you can avoid listing (and more importantly re-compiling) all the sources twice.
For question 3, these commands add a test called "MyTest" which invokes your executable "test" without any arguments. However, since you've added these commands to test/CMakeLists.txt and not your top...
When to use valueChangeListener or f:ajax listener?
...e" and FacesContext#renderResponse() to prevent that from happening. After all, using the valueChangeListener to execute business actions has actually always been a hack/workaround.
Summarized: Use the valueChangeListener only if you need to intercept on the actual value change itself. I.e. you're ...