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What is the C++ function to raise a number to a power?
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pow() in the cmath library. More info here.
Don't forget to put #include<cmath> at the top of the file.
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How to create a template function within a class? (C++)
... It's actually standard c++. You can do struct A { template<typename> void f(); }; template<> void A::f<int>() { } for example. You just can't specialize them in class scope, but you can do so well when done in namespace scope. (not to be confused with the scope that...
simple HTTP server in Java using only Java SE API
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Since Java SE 6, there's a builtin HTTP server in Sun Oracle JRE. The com.sun.net.httpserver package summary outlines the involved classes and contains examples.
Here's a kickoff example copypasted from their docs (to all people trying to edit it nonethe...
Difference between two lists
...m idea of equality, e.g. by ID, you'll need to implement IEqualityComparer<T>. For example:
public class IdComparer : IEqualityComparer<CustomObject>
{
public int GetHashCode(CustomObject co)
{
if (co == null)
{
return 0;
}
return co.I...
How do I erase an element from std::vector by index?
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To delete a single element, you could do:
std::vector<int> vec;
vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);
// Deletes the second element (vec[1])
vec.erase(vec.begin() + 1);
Or, to delete more than one element at once:
// Deletes the second through third...
Remove elements from collection while iterating
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Let me give a few examples with some alternatives to avoid a ConcurrentModificationException.
Suppose we have the following collection of books
List<Book> books = new ArrayList<Book>();
books.add(new Book(new ISBN("0-201-63361-2")));
books.add(new B...
The order of elements in Dictionary
...s of enumeration, each item in the dictionary is treated as a KeyValuePair<TKey, TValue> structure representing a value and its key. The order in which the items are returned is undefined.
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Assignment in an if statement
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Of course you could write an extension method:
public static void AsIf<T>(this object value, Action<T> action) where T : class
{
T t = value as T;
if (t != null)
{
action(t);
}
}
Then call it with:
animal.AsIf<Dog>(dog => {
// Use dog in here
}...
Is D a credible alternative to Java and C++? [closed]
... behind Java, C++, and C#. In fact, I'd argue it's even behind so-called "scripting" languages like Python, Perl, PHP, Ruby, and even JavaScript in these regards.
To be blunt, you simply can't build a large-scale, cross-platform application using D. With an immature standard library, no support i...
NOW() function in PHP
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Note that you may need to use the date_default_timezone_set function
– Michel Ayres
Apr 25 '14 at 13:28
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