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Dictionary returning a default value if the key does not exist [duplicate]
...
TryGetValue will already assign the default value for the type to the dictionary, so you can just use:
dictionary.TryGetValue(key, out value);
and just ignore the return value. However, that really will just return default(TValue), not some custom default value (...
Function passed as template argument
...ors as well, the usual solution is something like this instead:
template <typename F>
void doOperation(F f)
{
int temp=0;
f(temp);
std::cout << "Result is " << temp << std::endl;
}
which can now be called as either:
doOperation(add2);
doOperation(add3());
See it l...
How to change the ROOT application?
I'm trying to change the default application of a Tomcat 6 webserver to a different application than "ROOT" (inside webapps folder). What is the best way to do this?
...
What is the difference between 'typedef' and 'using' in C++11?
...nt
// C++20 (range-based for loop initialization statements).
std::vector<int> v{1, 2, 3};
for(typedef int Foo; Foo f : v) { (void)f; }
// ^^^^^^^^^^^^^^^ init-statement
whereas an alias-declaration is not an init-statement, and may thus not be used in contexts which allows initialization s...
Setting Android Theme background color
I'm trying to modify the default background theme color, which should be easy but surprisingly I can't get it working. Please note that I want the change to be across the entire app, not just for a single activity. Here is my code:
...
How to get value of selected radio button?
...es = document.getElementsByName('rate');
var rate_value;
for(var i = 0; i < rates.length; i++){
if(rates[i].checked){
rate_value = rates[i].value;
}
}
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improve this answer...
Animated loading image in picasso
...ect.
Steps:
progress_image.png
/res/drawable/progress_animation.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:gravity="center">
<animated-rotate xmlns:android="http://schemas.android.co...
Combine two data frames by rows (rbind) when they have different sets of columns
... bind_rows function which I assume is more efficient than smartbind.
df1 <- data.frame(a = c(1:5), b = c(6:10))
df2 <- data.frame(a = c(11:15), b = c(16:20), c = LETTERS[1:5])
dplyr::bind_rows(df1, df2)
a b c
1 1 6 <NA>
2 2 7 <NA>
3 3 8 <NA>
4 4 9 <NA&...
How to get a index value from foreach loop in jstl
...
use varStatus to get the index c:forEach varStatus properties
<c:forEach var="categoryName" items="${categoriesList}" varStatus="loop">
<li><a onclick="getCategoryIndex(${loop.index})" href="#">${categoryName}</a></li>
</c:forEach>
...
Make WPF window draggable, no matter what element is clicked
... typeof (EnableDragHelper),
new PropertyMetadata(default(bool), OnLoaded));
private static void OnLoaded(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var uiElement = dependencyObject as U...